Carlos Cabezas

Carlos Cabezas
Spanish National Research Council | CSIC · Instituto de Física Fundamental

PhD. in Chemistry

About

212
Publications
32,018
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
2,250
Citations
Citations since 2016
147 Research Items
1841 Citations
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500

Publications

Publications (212)
Article
Full-text available
We report the detection of magnesium dicarbide, MgC 2 , in the laboratory at centimeter wavelengths and assign ²⁴ MgC 2 , ²⁵ MgC 2 , and ²⁶ MgC 2 to 14 unidentified lines in the radio spectrum of the circumstellar envelope of the evolved carbon star IRC+10216. The structure of MgC 2 is found to be T-shaped with a highly ionic bond between the metal...
Preprint
Full-text available
We report the detection of magnesium dicarbide, MgC$_2$, in the laboratory at centimeter wavelengths and assign $^{24}$MgC$_2$, $^{25}$MgC$_2$, and $^{26}$MgC$_2$ to 14 unidentified lines in the radio spectrum of the circumstellar envelope of the evolved carbon star IRC+10216. The structure of MgC$_2$ is found to be T-shaped with a highly ionic bon...
Article
Full-text available
We report on the discovery of two new molecules, HCCCHCCC and HCCCCS, towards the starless core TMC-1 in the Taurus region from the QUIJOTE line survey in the 31.1–50.2 GHz frequency range. We identify a total of twenty-nine lines of HCCCHCCC and six rotational transitions of HCCCCS. The rotational quantum numbers range from J u = 10 up to 15 and K...
Preprint
We report on the discovery of two new molecules, HCCCHCCC and HCCCCS, towards the starless core TMC-1 in the Taurus region from the QUIJOTE line survey in the 31.1-50.2 GHz frequency range. We identify a total of twenty-nine lines of HCCCHCCC and six rotational transitions of HCCCCS. The rotational quantum numbers range from Ju=10 up to 15 and Ka <...
Article
Fourier transform microwave spectra for two isomers of the chlorine substituted vinyl radical have been observed in the 4-52 GHz frequency region. The observed radicals (2A') have been generated using electric discharges of diluted dichloro derivatives of ethylene as molecular precursors. Fine and hyperfine components observed for each rotational t...
Article
Full-text available
We present the 3mm spectral line survey performed at the IRAM 30m telescope towards the dense cores B1-b and TMC-1. Within the 46 GHz observed, we have identified more than 500 lines arising from more than 60 molecules. We have also detected tens of unidentified lines, allowing the discovery of new molecular species in space. In this contribution w...
Article
Full-text available
We present the recent results obtained with the QUIJOTE line survey of the cold dark core TMC-1. The observations have been carried out with the YEBES 40m radio telescope (see Figure 1) in the Q-band (31-50 GHz). A new set of receivers have been installed in the telescope within the frame of the ERC synergy Nanocosmos project that allows to cover t...
Article
Full-text available
We report the detection of fulvenallene ( c -C 5 H 4 CCH 2 ) in the direction of TMC-1 with the QUIJOTE ¹ line survey. Thirty rotational transitions with K a = 0,1,2,3 and J = 9−15 were detected. The best rotational temperature fitting of the data is 9 K and a derived column density is (2.7 ± 0.3) × 10 ¹² cm ⁻² , which is only a factor of 4.4 below...
Preprint
We report the detection of fulvenallene ($c$-C$_5$H$_4$CCH$_2$) in the direction of TMC-1 with the QUIJOTE line survey. Thirty rotational transitions with $K_a$=0,1,2,3 and $J$=9-15 were detected. The best rotational temperature fitting of the data is 9\,K and a derived column density is (2.7$\pm$0.3)$\times$10$^{12}$ cm$^{-2}$, which is only a fac...
Article
Full-text available
We report the discovery of five cyano derivatives of propene towards TMC-1 with the QUIJOTE line survey: trans and cis -crotononitrile ( t -CH 3 CHCHCN, c -CH 3 CHCHCN), methacrylonitrile (CH 2 C(CH 3 )CN), and gauche and cis -allyl cyanide ( g -CH 2 CHCH 2 CN and c -CH 2 CHCH 2 CN). The observed transitions allowed us to derive a common rotational...
Preprint
We report the discovery of five cyano derivatives of propene towards TMC-1 with the QUIJOTE line survey: $trans$ and $cis$-crotononitrile ($t$-CH$_3$CHCHCN, $c$-CH$_3$CHCHCN), methacrylonitrile (CH$_2$C(CH$_3$)CN), and $gauche$ and $cis$-allyl cyanide ($g$-CH$_2$CHCH$_2$CN and $c$-CH$_2$CHCH$_2$CN). The observed transitions allowed us to derive a c...
Article
Full-text available
Using the QUIJOTE line survey in the 32.0–50.4 GHz range, we report the discovery of the molecule CH 2 CCHC 4 H towards the prestellar cold core TMC-1 in the Taurus region. We also present a rigorous detection of CH 2 CCHC 3 N, along with its detailed analysis. We identified a total of twenty rotational transitions for each one of these molecules....
Preprint
Using the QUIJOTE line survey in the 32.0-50.4 GHz range, we report the discovery of the molecule CH2CCHC4H towards the prestellar cold core TMC-1 in the Taurus region. We also present a rigorous detection of CH2CCHC3N, along with its detailed analysis. We identified a total of twenty rotational transitions for each one of these molecules. The rota...
Preprint
Full-text available
Cyclic C5H (c-C5H), the radical formed by substituting an ethynyl group CCH for the hydrogen atom in the c-C3H radical, has been detected for the first time in the space. The c-C5H species is an isomer of the well-known linear radical l-C5H and is 6 kcal/mol less stable. A total of 17 rotational transitions were detected for the c-C5H species in TM...
Article
In recent years we have seen an important increase in the number of protonated molecules detected in cold dense clouds. Here we report the detection in TMC-1 of HCCNCH ⁺ , the protonated form of HCCNC, which is a metastable isomer of HC 3 N. This is the first protonated form of a metastable isomer detected in a cold dense cloud. The detection was b...
Preprint
Full-text available
In recent years we have seen an important increase in the number of protonated molecules detected in cold dense clouds. Here we report the detection in TMC-1 of HCCNCH+, the protonated form of HCCNC, which is a metastable isomer of HC3N. This is the first protonated form of a metastable isomer detected in a cold dense cloud. The detection was based...
Article
We report the detection of the protonated form of HC 7 N in TMC-1. The discovery of the cation HC 7 NH ⁺ was carried out via the observation of nine harmonically related lines in the Q -band using the Yebes 40 m radiotelescope. The observed frequencies allowed us to obtain the rotational constants B 0 = 553.938802 (160) MHz and D 0 = 3.6292 (705) H...
Preprint
Full-text available
We report the detection of the protonated form of HC7N in TMC-1. The discovery of the cation HC7NH+ was carried out via the observation of nine harmonically related lines in the Q-band using the Yebes 40m radiotelescope. The observed frequencies allowed us to obtain the rotational constants B_0=553.938802(160)MHz and D_0=3.6292(705) Hz. The identif...
Article
The rotational spectrum (4-40 GHz and 50-330 GHz) has been measured and analyzed for trifluoroacetaldehyde, also known as fluoral (CF3CHO), which is one of the degradation products of the fluorinated contaminants emitted into the atmosphere. The complexity of the spectroscopic analysis of this molecule arises from the strong coupling between the in...
Article
We report the discovery of the C 5 H ⁺ cation toward TMC-1 with the QUIJOTE line survey. Four lines from J = 7 − 6 up to J = 10 − 9 have been identified in perfect harmonic frequency relation that can be fit with B = 2411.94397 ± 0.00055 MHz and D = 138 ± 3 Hz. The standard deviation of the fit is 4.4 kHz. After discarding potential candidates, C 5...
Article
Methyl vinyl ketone is one of the major oxidation products of isoprene, and therefore, an important precursor of secondary organic aerosol. Understanding its interactions with water is relevant to gain insight into aerosol formation and improve the predictive power of atmospheric chemistry models. The molecular complex formed between methyl vinyl k...
Preprint
Full-text available
We report the discovery of the C5H+ cation toward TMC-1 with the QUIJOTE line survey. Four lines from J=7-6 up to J=10-9 have been identified in perfect harmonic frequency relation that can be fit with B=2411.94397 +/-0.00055 MHz and D=138+/-3 Hz. The standard deviation of the fit is 4.4 kHz. After discarding potential candidates, C5H- among them,...
Article
Dinitriles with a saturated hydrocarbon skeleton and a –C≡N group at each end can have large electric dipole moments. Their formation can be related to highly reactive radicals such as CH2CN, C2N, or CN. Thus, these saturated dinitriles are potential candidates to be observed in the interstellar medium. In this work, two members of this family, hex...
Article
We report the first detection in space of the single deuterated isotopologue of methyldiacetylene, CH 2 DC 4 H. A total of 12 rotational transitions, with J = 8–12 and K a = 0 and 1, were identified for this species in TMC-1 in the 31.0–50.4 GHz range using the Yebes 40m radio telescope. The observed frequencies allowed us to obtain, for the first...
Article
We report the detection in TMC-1 of the cation HCCS ⁺ ( X̃ ³ Σ ⁻ ), which is the protonated form of the widespread radical CCS. This is the first time that a protonated radical has been detected in a cold dark cloud. Twenty-six hyperfine components from twelve rotational transitions have been observed with the Yebes 40 m and IRAM 30m radio telescop...
Preprint
Full-text available
We report the detection in TMC-1 of the cation HCCS+ (3Sigma-), which is the protonated form of the widespread radical CCS. This is the first time that a protonated radical has been detected in a cold dark cloud. Twenty-six hyperfine components from twelve rotational transitions have been observed with the Yebes 40m and IRAM 30m radio telescopes. W...
Preprint
Full-text available
We report the first detection in space of the single deuterated isotopologue of methyldiacetylene, CH2DC4H. A total of 12 rotational transitions, with J = 8-12 and Ka = 0 and 1, were identified for this species in TMC-1 in the 31.0-50.4 GHz range using the Yebes 40m radio telescope. The observed frequencies allowed us to obtain, for the first time,...
Article
Context. The reaction between carbon atoms and vinyl cyanide, CH 2 CHCN, is a formation route to interstellar 3-cyano propargyl radical, CH 2 C 3 N, a species that has recently been discovered in space. The 1-cyano propargyl radical (HC 3 HCN), an isomer of CH 2 C 3 N, is predicted to be produced in the same reaction at least twice more efficiently...
Article
We report the detection of the propargyl radical (CH 2 CCH) in the cold dark cloud TMC-1 in the λ 3 mm wavelength band. We recently discovered this species in space toward the same source at a wavelength of λ 8 mm. In those observations, various hyperfine components of the 2 0,2 –1 0,1 rotational transition, at 37.5 GHz, were detected using the Yeb...
Preprint
Full-text available
We report the detection of the propargyl radical (CH2CCH) in the cold dark cloud TMC-1 in the lambda 3 mm wavelength band. We recently discovered this species in space toward the same source at a wavelength of lambda 8 mm. In those observations, various hyperfine components of the 2,0,2-1,0,1 rotational transition, at 37.5 GHz, were detected using...
Article
We report on the detection, for the first time in space, of the radical HCCCO and of pentacarbon monoxide, C 5 O. The derived column densities are (1.6 ± 0.2) × 10 ¹¹ cm ⁻² and (1.5 ± 0.2) × 10 ¹⁰ cm ⁻² , respectively. We have also analysed the data for all the molecular species of the families HC n O and C n O within our QUIJOTE’s line survey. Upp...
Preprint
Full-text available
We report on the detection, for the first time in space, of the radical HCCCO and of pentacarbon monoxide, C5O. The derived column densities are (1.6+/-0.2)e11 cm-2 and (1.5+/-0.2)e10 cm-2, respectively. We have also analysed the data for all the molecular species of the families HCnO and CnO within our QUIJOTE line survey. Upper limits are obtaine...
Article
Context. The carbon-rich envelope of the asymptotic giant branch star CW Leo, IRC+10216, is one of the richest molecular sources in the sky. Available spectral surveys below 51 GHz are more than 25 years old, and new work is needed. Aims. Characterizing the rich molecular content of this source, specially for heavy species, requires carrying out ve...
Preprint
Context. IRC+10216, the carbon-rich envelope of the asymptotic giant branch (AGB) star CW Leo, is one of the richest molecular sources in the sky. Available spectral surveys below 51 GHz are more than 25 years old and new work is needed. Aims. Characterizing the rich molecular content of this source, specially for heavy species, requires to carry o...
Preprint
Full-text available
The reaction between carbon atoms and vinyl cyanide, CH2CHCN, is a formation route to interstellar 3-cyano propargyl radical, CH2C3N, a species that has recently been discovered in space. The 1-cyano propargyl radical (HC3HCN), an isomer of CH2C3N, is predicted to be produced in the same reaction at least twice more effciently than CH2C3N. Hence, H...
Article
We report the detection of two isomers of ethynyl cyclopentadiene ( c -C 5 H 5 CCH), namely 1- and 2-ethynyl-1,3-cyclopentadiene, in the direction of TMC-1. We derive column densities of (1.4 ± 0.2) × 10 ¹² cm ⁻² and (2.0 ± 0.4) × 10 ¹² cm ⁻² , respectively, for these two cyclopentadiene derivatives, which imply that they are about ten times less a...
Preprint
Full-text available
We report the detection of two isomers of ethynyl cyclopentadiene (c-C5H5CCH), namely 1- and 2-ethynyl-1,3-cyclopentadiene, in the direction of TMC-1. We derive column densities of (1.4 +/- 0.2)e12 cm-2, and (2.0 +/- 0.4)e12 cm-2, respectively, for these two cyclopentadiene derivatives, which imply that they are about ten times less abundant than c...
Preprint
Full-text available
We report the first detection in interstellar space of the 3-cyano propargyl radical (CH 2 C 3 N). This species was observed in the cold dark cloud TMC-1 using the Yebes 40m telescope. A total of seven rotational transitions for both ortho-and para-CH 2 C 3 N species were observed in the 31.0-50.4 GHz range. We derive a total column density of (1.6...
Article
We report the first identification in space of H 2 NC, a high-energy isomer of H 2 CN that has been largely ignored in chemical and astrochemical studies. The observation of various unidentified lines around 72.2 GHz in the cold dark cloud L483 motivated the search and successful detection of additional groups of lines in harmonic relation. Followi...
Article
We report the detection, for the first time in space, of a new non-functionalised hydrocarbon cycle in the direction of TMC-1: o -C 6 H 4 (ortho-benzyne). We derive a column density for this hydrocarbon cycle of (5.0 ± 1.0) × 10 ¹¹ cm ⁻² . The abundance of this species is around 30 times lower than that of cyclopentadiene and indene. We compare the...
Article
After the previous discovery of MgC 3 N and MgC 4 H in IRC +10216, a deeper Q -band (31.0–50.3 GHz) integration on this source had revealed two additional series of harmonically related doublets that we assigned on the basis of quantum mechanical calculations to the larger radicals MgC 5 N and MgC 6 H. The results presented here extend and confirm...
Preprint
Full-text available
We report the detection, for the first time in space, of a new non-functionalised hydrocarbon cycle in the direction of TMC-1: o-C6H4 (ortho-benzyne). We derive a column density for this hydrocarbon cycle of (5 +/- 1)e11 cm-2. The abundance of this species is around 30 times lower than that of cyclopentadiene and indene. We compare the abundance of...
Preprint
Full-text available
After the previous discovery of MgC$_3$N and MgC$_4$H in IRC+10216, a deeper Q-band (31.0-50.3 GHz) integration on this source had revealed two additional series of harmonically related doublets that we assigned on the basis of quantum mechanical calculations to the larger radicals MgC$_5$N and MgC$_6$H. The results presented here extend and confir...
Preprint
Full-text available
We report the first identification in space of H2NC, a high-energy isomer of H2CN that has been largely ignored in chemical and astrochemical studies. The observation of various unidentified lines around 72.2 GHz in the cold dark cloud L483 motivated the search for, and successful detection of, additional groups of lines in harmonic relation. After...
Article
We report the first detection in space of the single deuterated isotopologue of methylcyanoacetylene, CH 2 DC 3 N. A total of 15 rotational transitions, with J = 8–12 and K a = 0 and 1, were identified for this species in TMC-1 in the 31.0–50.4 GHz range using the Yebes 40 m radio telescope. The observed frequencies were used to derive for the firs...
Article
We report the first detection in space of the cumulene carbon chain l -H 2 C 5 . A total of eleven rotational transitions, with J up = 7−10 and K a = 0 and 1, were detected in TMC-1 in the 31.0–50.4 GHz range using the Yebes 40 m radio telescope. We derived a column density of (1.8 ± 0.5)×10 ¹⁰ cm ⁻² . In addition, we report observations of other c...
Preprint
Full-text available
We report the first detection in space of the single deuterated isotopologue of methylcyanoacetylene, CH$_2$DC$_3$N. A total of fifteen rotational transitions, with $J$ = 8-12 and $K_a$ = 0 and 1, were identified for this species in TMC-1 in the 31.0-50.4 GHz range using the Yebes 40m radio telescope. The observed frequencies were used to derive fo...
Preprint
Full-text available
We report the first detection in space of the cumulene carbon chain $l$-H$_2$C$_5$. A total of eleven rotational transitions, with $J_{up}$ = 7-10 and $K_a$ = 0 and 1, were detected in TMC-1 in the 31.0-50.4 GHz range using the Yebes 40m radio telescope. We derive a column density of (1.8$\pm$0.5)$\times$10$^{10}$ cm$^{-2}$. In addition, we report...
Article
We report the detection, for the first time in space, of cyano thioformaldehyde (HCSCN) and propynethial (HCSCCH) towards the starless core TMC-1. Cyano thioformaldehyde presents a series of prominent a - and b -type lines, which are the strongest previously unassigned features in our Q -band line survey of TMC-1. Remarkably, HCSCN is four times mo...
Preprint
Full-text available
We report the detection, for the first time in space, of cyano thioformaldehyde (HCSCN) and propynethial (HCSCCH) towards the starless core TMC-1. Cyano thioformaldehyde presents a series of prominent a- and b-type lines, which are the strongest previously unassigned features in our Q-band line survey of TMC-1. Remarkably, HCSCN is four times more...
Article
We report the detection of the oxygen-bearing complex organic molecules propenal (C 2 H 3 CHO), vinyl alcohol (C 2 H 3 OH), methyl formate (HCOOCH 3 ), and dimethyl ether (CH 3 OCH 3 ) toward the cyanopolyyne peak of the starless core TMC-1. These molecules were detected through several emission lines in a deep Q -band line survey of TMC-1 carried...
Article
Full-text available
The reaction system between the simplest Criegee intermediate, CH2OO, and the greenhouse gas CO2 has been investigated by Fourier transform microwave spectroscopy. The CH2OO-CO2 weakly bound complex was identified in the rotational spectrum, where inversion doublets due to the tunnelling motion between two equivalent configurations of the complex,...
Article
Full-text available
We report the detection for the first time in space of three new pure hydrocarbon cycles in TMC-1: c -C 3 HCCH (ethynyl cyclopropenylidene), c -C 5 H 6 (cyclopentadiene), and c -C 9 H 8 (indene). We derive a column density of 3.1 × 10 ¹¹ cm ⁻² for the first cycle and similar values, in the range (1−2) × 10 ¹³ cm ⁻² , for the second and third. This...
Article
We report the first detection in space of the two doubly deuterated isotopologues of methyl acetylene. The species CHD 2 CCH and CH 2 DCCD were identified in the dense core L483 through, respectively, nine and eight rotational lines in the 72–116 GHz range using the 30 m telescope of the Institut de Radioastronomie Millimétrique (IRAM). We combined...
Preprint
Full-text available
We report the detection for the first time in space of three new pure hydrocarbon cycles in TMC-1: c-C3HCCH (ethynyl cyclopropenylidene), c-C5H6 (cyclopentadiene) and c-C9H8 (indene). We derive a column density of 3.1e11 cm-2 for the former cycle and similar values, in the range (1-2)e13 cm-2, for the two latter molecules. This means that cyclopent...
Preprint
Full-text available
We report the detection of the oxygen-bearing complex organic molecules propenal (C2H3CHO), vinyl alcohol (C2H3OH), methyl formate (HCOOCH3), and dimethyl ether (CH3OCH3) toward the cyanopolyyne peak of the starless core TMC-1. These molecules are detected through several emission lines in a deep Q-band line survey of TMC-1 carried out with the Yeb...
Preprint
Full-text available
We report the first detection in space of the two doubly deuterated isotopologues of methyl acetylene. The species CHD2CCH and CH2DCCD were identified in the dense core L483 through nine and eight, respectively, rotational lines in the 72-116 GHz range using the IRAM 30m telescope. The astronomical frequencies observed here were combined with labor...
Article
We report the detection of the sulfur-bearing species NCS, HCCS, H 2 CCS, H 2 CCCS, and C 4 S for the first time in space. These molecules were found towards TMC-1 through the observation of several lines for each species. We also report the detection of C 5 S for the first time in a cold cloud through the observation of five lines in the 31–50 GHz...
Preprint
Full-text available
We report the detection of the sulfur-bearing species NCS, HCCS, H2CCS, H2CCCS, and C4S for the first time in space. These molecules were found towards TMC-1 through the observation of several lines for each species. We also report the detection of C5S for the first time in a cold cloud through the observation of five lines in the 31-50 GHz range....
Article
We present the first identification in interstellar space of the propargyl radical (CH 2 CCH). This species was observed in the cold dark cloud TMC-1 using the Yebes 40 m telescope. The six strongest hyperfine components of the 2 0, 2 –1 0, 1 rotational transition, lying at 37.46 GHz, were detected with signal-to-noise ratios from 4.6 σ to 12.3 σ ....
Preprint
Full-text available
We present the first identification in interstellar space of the propargyl radical (CH2CCH). This species was observed in the cold dark cloud TMC-1 using the Yebes 40m telescope. The six strongest hyperfine components of the 2,0,2-1,0,1 rotational transition, lying at 37.46~GHz, were detected with signal-to-noise ratios in the range 4.6-12.3 sigma....
Preprint
Full-text available
We present the discovery in TMC-1 of allenyl acetylene, H2CCCHCCH, through the observation of nineteen lines with a signal-to-noise ratio ~4-15. For this species, we derived a rotational temperature of 7 +/- 1 K and a column density of (1.2 +/- 0.2)e13 cm-2. The other well known isomer of this molecule, methyl diacetylene (CH3C4H), has also been ob...
Article
Full-text available
The microwave spectrum of the doubly deuterated cyanomethyl radical (D2CCN) in its ground electronic state (²B1) has been observed for the lowest four rotational transitions (NKa,Kc = 10,1–00,0, 20,2–10,1, 21,2–10,1 and 21,1–11,0) using a Fourier transform microwave spectrometer in combination with a pulsed discharge nozzle. A total of 394 hyperfin...
Article
We present the discovery in TMC-1 of allenyl acetylene, H 2 CCCHCCH, through the observation of nineteen lines with a signal-to-noise ratio ∼4–15. For this species, we derived a rotational temperature of 7 ± 1 K and a column density of 1.2 ± 0.2 × 10 ¹³ cm ⁻² . The other well known isomer of this molecule, methyl diacetylene (CH 3 C 4 H), has also...
Preprint
Full-text available
We present the discovery in TMC-1 of vinyl acetylene, CH2CHCCH, and the detection, for the first time in a cold dark cloud, of HCCN, HC4N, and CH3CH2CN. A tentative detection of CH3CH2CCH is also reported. The column density of vinyl acetylene is (1.2 +/- 0.2)e13 cm-2, which makes it one of the most abundant closed-shell hydrocarbons detected in TM...
Article
We present the discovery in TMC-1 of vinyl acetylene, CH 2 CHCCH, and the detection, for the first time in a cold dark cloud, of HCCN, HC 4 N, and CH 3 CH 2 CN. A tentative detection of CH 3 CH 2 CCH is also reported. The column density of vinyl acetylene is (1.2 ± 0.2) × 10 ¹³ cm ⁻² , which makes it one of the most abundant closed-shell hydrocarbo...
Article
We report the detection in TMC-1 of the protonated form of C 3 S. The discovery of the cation HC 3 S ⁺ was carried through the observation of four harmonically related lines in the Q band using the Yebes 40 m radiotelescope, and is supported by accurate ab initio calculations and laboratory measurements of its rotational spectrum. We derive a colum...
Article
Our observations of TMC-1 with the Yebes 40 m radio telescope in the 31.0–50.3 GHz range allowed us to detect a group of unidentified lines, showing a complex line pattern indicative of an open-shell species. The observed frequencies of these lines and the similarity of the spectral pattern with that of the 2 0, 2 –1 0, 1 rotational transition of H...
Article
Using the Yebes 40m and IRAM 30m radiotelescopes, we detected two series of harmonically related lines in space that can be fitted to a symmetric rotor. The lines have been seen towards the cold dense cores TMC-1, L483, L1527, and L1544. High level of theory ab initio calculations indicate that the best possible candidate is the acetyl cation, CH3C...