Spectroscopy Letters (SPECTROSC LETT )

Publisher: Taylor & Francis

Description

This rapid publication journal provides vital coverage of fundamental developments in spectroscopy. Offering communications of original, experimental, and theoretical work, this international journal reports such methods as NMR, ESR, microwave, IR, Raman, and UV spectroscopy. In addition, atomic emission and absorption, X-ray spectroscopy, mass spectrometry, lasers, electron microscopy, molecular fluorescence, and molecular phosphorescence are discussed.

  • Impact factor
    0.67
    Show impact factor history
     
    Impact factor
  • 5-year impact
    0.61
  • Cited half-life
    0.00
  • Immediacy index
    0.08
  • Eigenfactor
    0.00
  • Article influence
    0.15
  • Website
    Spectroscopy Letters website
  • Other titles
    Spectroscopy letters
  • ISSN
    0038-7010
  • OCLC
    1642104
  • Material type
    Periodical, Internet resource
  • Document type
    Journal / Magazine / Newspaper, Internet Resource

Publisher details

Taylor & Francis

  • Pre-print
    • Author can archive a pre-print version
  • Post-print
    • Author cannot archive a post-print version
  • Restrictions
    • 12 month embargo for STM, Behavioural Science and Public Health Journals
    • 18 month embargo for SSH journals
  • Conditions
    • Some individual journals may have policies prohibiting pre-print archiving
    • Pre-print on authors own website, Institutional or Subject Repository
    • Post-print on authors own website, Institutional or Subject Repository
    • Publisher's version/PDF cannot be used
    • On a non-profit server
    • Published source must be acknowledged
    • Must link to publisher version
    • Set statements to accompany deposits (see policy)
    • Publisher will deposit to PMC on behalf of NIH authors.
    • STM: Science, Technology and Medicine
    • SSH: Social Science and Humanities
    • 'Taylor & Francis (Psychology Press)' is an imprint of 'Taylor & Francis'
  • Classification
    ​ yellow

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy is classically used to monitor homopolymerizations. In this article, this analytical technique was extended to monitor the synthesis of VIVIPRINT 300, which is a copolymer of 2-hydroxyethyl methacrylate (HEMA) and N-[3-dimethylaminopropyl]methacrylamide (DMAPMA). The calibration curves devised for this study were based on the two homopolymers P(HEMA) and P(DMAPMA). A good correlation was realized between the FTIR absorbance intensities observed respectively at 1300 cm−1 (polymerized C-O ester bond) and 1230 cm−1 (polymerized C-N amide bond) and the level of residual HEMA and DMAPMA monomers determined by GC. Application of these calibration curves to the copolymerization also exhibited a good correlation of data relating to residual monomer determination by FTIR and GC, validating the success of this spectroscopic in situ technique.
    Spectroscopy Letters 01/2015; 48(1).
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    ABSTRACT: The compressive sensing technique is a new mechanism for hyperspectral imaging, and practical hyperspectral compressive sensors have been designed. To improve the reconstruction performance, compressive sensing should exploit some prior knowledge of the original signals. In this letter, we propose a novel and efficient reconstruction approach for compressive sensors by exploiting four important priors: spatial 2D piecewise smoothness, adjacent spectrum correlation, low rank, and structure similarity property. It is worth mentioning that the structure similarity property has never been taken into account in the existing schemes. In addition, an efficient solve algorithm is developed for our approach. The simulation experimentations show that our approach recovers hyperspectral images with far less reconstruction error than existing schemes.
    Spectroscopy Letters 01/2015; 48(1).
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    ABSTRACT: The need for materials which combine large nonlinear optical characteristics with resistance to physical and chemical attack and good growth properties have led to the investigation of semi-organic materials. An optically negative nonlinear optical crystal cadmium mercury thiocyanate has been prepared by slow solvent evaporation method. The grown crystal was characterized by single crystal X-ray diffraction technique to determine the cell parameters. The spectroscopic studies revealed that the grown crystal has good optical transparency. The mechanical strength of the grown crystal was found from Vickers microhardness measurement and the conductivity analysis was carried out using complex impedance spectra.
    Spectroscopy Letters 01/2015; 48(1).
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    ABSTRACT: To study the effect of opacity on the solar x-ray spectral line, using the method of escape factor, we analyze the effect of opacity on the solar oxygen VIII spectral line, and we estimate the effective emission thickness of the oxygen VIII emitting region in the solar atmosphere. Results show that the opacity has a greater effect on the solar oxygen VIII spectral line, and the effective emission thickness of the oxygen VIII ion is greater than that for some ions in the solar ultraviolet spectral line. This study has important reference significance in solar plasma diagnoses in the x-ray region.
    Spectroscopy Letters 01/2015; 48(1).
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    ABSTRACT: Automated real-time tissue assessment using Raman spectroscopy for breast cancer detection is feasible; however, long-term specificity and sensitivity as reported so far in the literature can still be improved by a more reliable algorithm for breast cancer detection. Applying automatic reduction of background fluorescence to the Raman spectra and Bayesian classification on 18 discriminant Raman bands in the range of 1200–1800 cm−1, we achieved 100% accuracy in classifying breast biopsies of healthy and cancerous tissues, making it suitable for automated breast cancer diagnosis and appropriate for long-term use in real time in a surgery room or research scenarios. The long-term reliability of this approach was cross-validated using three methods: resubstitution, leave-one-out, and holdout. The holdout method has the potential of estimating the upper bound of classification error probability of the Bayesian classifier; the holdout method allowed us to perform 50,000 classification trials with only three misclassifications, which demonstrates that the high performance in sensitivity and specificity will be retained in future applications of this approach for breast cancer detection.
    Spectroscopy Letters 01/2015; 48(1).
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    ABSTRACT: This article reports on the optical properties of Sm3+-activated GdB3O6 phosphors based on the measurement of their photoluminescence spectra and luminescence decay curves. Energy transfer from Gd3+ to Sm3+ and the concentration quenching of the Sm3+ ion emission are investigated. From the photoluminescence spectra and decay curves, the energy transfer from Gd3+ to Sm3+ is confirmed. The concentration quenching of the Sm3+ ion emission can be ascribed to resonant cross-relaxation. The interaction between the Sm3+ ions is derived of the electric dipole–dipole type through fitting the data with the Inokuti-Hirayama model. The critical distances and energy transfer microparameter for the transfer processes are given. The decay curves of Sm3+4G5/2 level exhibiting a buildup and decay process also confirm the energy transfer from Gd3+ to Sm3+ and between Sm3+ ions.
    Spectroscopy Letters 01/2015; 48(1).
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    ABSTRACT: Cyanobacteriochromes are phytochrome homologues in cyanobacteria that act as photoreceptor sensors. We report the photochemistry of All4261 GAF2, a novel cyanobacteriochrome from the heterocyst-forming cyanobacterium Anabaena sp. PCC 7120. All4261 contains four tandemly arranged GAF domains. The respective chromophore domains were co-expressed in Escherichia coli with the genes for phycocyanobilin biosynthesis enzymes, HO1, and PcyA. The resulting proteins were analyzed by zinc-induced fluorescence, UV-Vis absorption and emission fluorescence spectra. Only All4261 GAF2 binded chromophore covalently, having zinc-induced fluorescence band in SDS-PAGE gel with the zinc acetate solution existed. Absorption spectra analysis showed that All4261 GAF2 had absorption peaks at 340 nm and 590 nm, failing to show photoreversibility. Fluorescence spectra revealed that All4261 GAF2 had a fluorescence emission peak at 645 nm, with high fluorescence quantum yield and molar extinction coefficient.
    Spectroscopy Letters 01/2015; 48(1).
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    ABSTRACT: The Fourier transform Raman and Fourier transform infrared spectra for minoxidil have been recorded in the region 4000—100 cm−1 and 4000—450 cm−1, respectively. The structural and spectroscopy data of the molecule in the ground state were calculated by using density functional theory methods with 6-311G (d, p) basis set. A detailed vibrational analysis of the title compound has been done using normal coordinate analysis following the scaled quantum mechanical force field methodology. The calculated molecular geometry parameters and scaled vibrational wavenumbers are well compared with the experimental data. The electronic properties, such as excitation energies, absorption wavelength, highest occupied molecular orbital (HOMO), and lowest unoccupied molecular orbital (LUMO) energies were performed by time-dependent density functional theory approach, and the results are in good agreement with experimental absorption spectrum. The charge delocalizations of these molecules have been analyzed using natural bond orbital analysis. The molecule orbital contributions are studied by density of energy states. Fukui functions, local softness, and electrophilicity indices for selected atomic sites of the title compound are determined. Finally, the thermal behaviors of the compound have been calculated by different temperature.
    Spectroscopy Letters 01/2015; 48(1).
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    ABSTRACT: The reaction mechanism and dynamics of the quenching of the excited triplet of vitamin [Inline formula] by vitamin C was studied in both homogenous ethylene glycol-H2O plus hexadecyltrimethylammonium bromide, aerosol OT, sodium dodecyl sulfate, and Triton X-100 micelle solutions by time-resolved electronic paramagnetic resonance. The photolysis of vitamin K3 in EG-H2O solution led to the chemically induced dynamic electron polarization (CIDEP) of the vitamin K3 neutral radical VK3H• and ethylene glycol ketyl radical, which showed that a hydrogen atom abstraction reaction of [Inline formula] with the solvent ethylene glycol occurred. The triplet mechanism was the primary mechanism underlying the generation of CIDEP, suggesting that [Inline formula] quickly reacted with ethylene glycol before spin-lattice relaxation. During the photolysis of vitamin K3 and vitamin C in ethylene glycol-H2O solution, [Inline formula] abstracted hydrogen atoms not only from the solvent ethylene glycol but also from a vitamin C monoanion. The stronger CIDEP signal of the vitamin C monoanion radical indicated that [Inline formula] can be rapidly quenched by vitamin C. In hexadecyltrimethylammonium bromide (aerosol OT, sodium dodecyl sulfate)/ethylene glycol-H2O micelle solutions, lipid-soluble [Inline formula] needed to diffuse around the micelle surface to react with the water-soluble vitamin C. The spin-lattice relaxation of the parent [Inline formula] resulted in weaker CIDEP of the reaction-generated radicals. Furthermore, the attraction between the positive charge layer of the hexadecyltrimethylammonium bromide micelle and vitamin C monoanion made the quenching reaction of [Inline formula] by vitamin C rapid, whereas the repulsion between the negative charge layer of aerosol OT (sodium dodecyl sulfate) micelle and vitamin C monoanion made the quenching reaction slow. For Triton X-100 micelle, the coexistence of vitamin K3 and vitamin C in the same polyethylene glycol shell resulted in the fastest quenching reaction and strong CIDEP of the monoanion radical.
    Spectroscopy Letters 01/2015; 48(1).
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    ABSTRACT: Identification of larvae is of great importance in the field of biosafety. Near-infrared spectroscopy (NIRS) was applied in the identification of larvae, and 200 larvae samples of Heliocoverpa armigera Hubner (cotton bollworm), Spodoptera exigua Hiibner (beet armyworm), Prodenia litura Fabriicus, and Ostrinia nubilalis Hubern (corn borer) were selected, from which the spectra of the 4000-7000 cm−1 waveband were obtained for analysis. The results showed that the identification accuracy of the prediction larvae sets predicted by the model of PLS-DA (partial least squares-discriminant analysis) was 100%; the correlation coefficient between the NIR-predicted category variable value and the true value was above 0.90; and the identification accuracy of the prediction larvae sets predicted by the Mahalanobis distance method and correlation coefficient method was above 90%. NIRS provides a promising approach for early category identification of pests in agriculture and forestry.
    Spectroscopy Letters 01/2015; 48(1).
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    ABSTRACT: Near-infrared spectra of methanol-acetone and ethanol-acetone mixtures in the entire mole fraction range in increments of 0.1 were recorded in the region of 7500–6000 cm−1. The first overtone bands of the hydroxyl (OH) groups were assigned to the polymeric and oligomeric OH associations. In both solutions, the frequency of the polymeric OH band decreased with the increase in the mole fraction of alcohol, which indicated the increase in the hydrogen bonding strength. The integrated area of the polymeric OH band followed the opposite trend to the frequency with the mole fraction. The nonlinearity of the plot of the integrated band area of the polymeric OH band of methanol versus the mole fraction of acetone revealed the nonideal character of the methanol-acetone mixtures, whereas the opposite was observed for the ethanol-acetone mixtures. These observations have been explained in terms of mechanical and electrical anharmonicities of the OH oscillator.
    Spectroscopy Letters 01/2015; 48(1).
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    ABSTRACT: The infrared spectral characteristics of ordered mixed-layer illite/smectite interstratified clay mineral with different mixed-layer ratios (S% = 5%, 10%, 15%, 20%, 25%, and 30%, where S% is mixed-layer ratio) from the Shihezi Formation of Late Permian in the Hanxing mining area, Hebei province of China, were studied by infrared spectroscopy. The results show that three infrared regions (3625 cm−1±, 1200–1000 cm−1, 850–700 cm−1) changed with S%'s variation. The characteristic absorption bands of smectite at 3640 cm−1, 1030 cm−1, and 825 cm−1 disappeared gradually with the decrease of S%, and the intensity of characteristic absorption bands of illite at 3625 cm−1, 1100 cm−1, 1024 cm−1, 796 cm−1, and 777 cm−1 increased. These changes indicated that the illitization of smectite was realized by partial substitution of aluminum iron (Al3+) for silicon iron (Si4+) in silico-oxygen (Si–O) tetrahedron.
    Spectroscopy Letters 07/2014; 47(7).
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    ABSTRACT: The present work is a methodological study to investigate the effect of chromium (VI) stress on wheat seedlings. Point detection capability of laser-induced breakdown spectroscopy (LIBS) was utilized for the monitoring of In-Situ chromium uptake in wheat (Triticum aestivum) seedlings. Chromium accumulation and its effects on other elements in wheat seedling were investigated by comparing the intensities of spectral lines of chromium and other minerals present in the LIBS spectra. In-Situ LIBS spectra of the different parts of the wheat seedlings were recorded by directly focusing the laser beam on the surface of root, stem, and leaf of the seedlings grown with and without chromium-containing solutions. The spectra obtained from the different parts (root, stem, and leaf) of the wheat plant were analyzed to determine the distribution pattern/accumulation of chromium. Effect of the chromium uptake on the distribution pattern of other elements like calcium (Ca), magnesium (Mg), sodium (Na), and potassium (K) was also investigated. It was observed that chromium concentrations in plant organs decreased in the following order: roots > leaves > stems.
    Spectroscopy Letters 07/2014; 47(7).
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    ABSTRACT: As confirmed by transmission electron microscopy, we found that Hg2+ has good affinity to etch the sharp corners of silver triangular nanoplates. The etching process induced an apparent absorption peak shift of silver triangular nanoplates from 580 to 530 nm. The shift degree of the absorption peak has a good linear relationship with the amount of Hg2+ added; thus, Hg2+ with a concentration from 0.2 to 1.5 µM can be quantitatively detected by measuring silver triangular absorption. The interaction between mercury and silver triangular nanoplates proposed here is also a new example of silver triangular nanoplate etching and important for explaining the etching mechanism.
    Spectroscopy Letters 07/2014; 47(7).
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    ABSTRACT: Urban atmospheric dust is a significant problem and becoming a considerable pollution source in many cities. This study was based on a comparison of spectral reflectance on the surfaces of dusty and clean leaves. A significant linear relationship (r = 0.811) correlation between the dust weight and near-infrared band region (700–1000 nm) was found through analysis of the spectral data. This relationship obtained from near-infrared band regions, based on the main effects and cluster and interval analysis, was more distinct and stable than that of blue, green, red, and middle-infrared band regions. Thus, the use of near-infrared band data is a reliable method to estimate the amount of dust deposition on plant leaves. A regression model (R2 = 64.3%) was constructed based on dust deposition on plant leaves and a near-infrared ratio. The model proved to be accurate as regards an estimation of dust weight, based on a comparison of residuals (normal distribution) and accuracy tests (slope = 0.8437). This model could provide a methodological basis for spatial dust distribution analysis and has the potential for evaluating air pollution levels.
    Spectroscopy Letters 07/2014; 47(7).
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    ABSTRACT: This study details an in situ Fourier transform infrared spectroscopy analytical system that was employed to follow chemical variations in the functional groups on coal surface during the oxidation process at low temperatures. In the reported in situ Fourier transform infrared spectroscopy system, a special chamber was used to contain the coal powders, and a gas inlet tube and a programmable heater were used to simulate different reaction atmospheres and temperatures. The comparisons between in situ and ex situ Fourier transform infrared spectroscopy spectra indicate that the in situ Fourier transform infrared spectroscopy data offer a more accurate reflection of changes in the functional groups. The real-time changes of aliphatic hydrocarbon groups and oxygen-containing groups in a lignite coal sample were analyzed from 30°C to 220°C using in situ Fourier transform infrared spectroscopy. The experimental results indicate that the chemical variations in the functional groups are affected by their relative chemical activities. The results show that the presence of aliphatic groups on the coal surface varies with temperature. Over the range of 30–70°C the presence of these groups decreases, but then their abundance increases over the range of 70–180°C and finally decreases again when the temperature is increased to between 180°C and 220°C. With respect to oxygen-containing functional groups, three various trends were observed as the test temperature was varied. Our conclusion was that these variations are a function of the reaction activities of the various oxygen-containing functional groups.
    Spectroscopy Letters 07/2014; 47(7).
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    ABSTRACT: The mineral barahonaite is in all probability a member of the smolianinovite group. The mineral is an arsenate mineral formed as a secondary mineral in the oxidized zone of sulphide deposits. We have studied the barahonaite mineral using a combination of Raman and infrared spectroscopy. The mineral is characterized by a series of Raman bands at 863 cm−1 with low wavenumber shoulders at 802 and 828 cm−1. These bands are assigned to the arsenate and hydrogen arsenate stretching vibrations. The infrared spectrum shows a broad spectral profile. Two Raman bands at 506 and 529 cm−1 are assigned to the triply degenerate arsenate bending vibration (F 2, ν4), and the Raman bands at 325, 360, and 399 cm−1 are attributed to the arsenate ν2 bending vibration. Raman and infrared bands in the 2500–3800 cm−1 spectral range are assigned to water and hydroxyl stretching vibrations. The application of Raman spectroscopy to study the structure of barahonaite is better than infrared spectroscopy, probably because of the much higher spatial resolution.
    Spectroscopy Letters 07/2014; 47(7).
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    ABSTRACT: A novel green-emitting phosphor copper-doped barium aluminate was synthesized by the conventional ceramic method. The crystallographic phase and microstructure identification were performed by powder X-ray diffraction and scanning electron microscopy. The X-ray diffraction pattern of the sample confirms the formation of the phosphor, and the scanning electron microscope image was recorded to observe the surface morphology. Differential thermal analysis results show that the initiatory decomposition temperature of barium carbonate starts at about 728°C. Cathodoluminescence studies have been undertaken to ensure the successful incorporation of copper ions in the barium aluminate host lattice. Under the excitation of the electron beam, the phosphor can efficiently display a broad green emission centered at 490 nm, corresponding to the transition from the conduction band edge to the excited state of copper in the barium aluminate host. However, there are no data available on copper luminescence in barium aluminate. New results on 3d activators of copper emission in the barium aluminate host are reported in this article, thus extending the list of copper-activated phosphors. These results strongly indicate that the copper-activated barium aluminate is a potential material used as a new high-brightness green phosphor for ultraviolet light-emitting diode and display devices.
    Spectroscopy Letters 07/2014; 47(7).
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    ABSTRACT: There are a large number of boron-containing minerals, of which vonsenite [Inline formula] is one. Some discussion about the molecular structure of vonsenite exists in the literature. Whether water is involved in the structure is ill-determined. The molecular structure of vonsenite has been assessed by the combination of Raman and infrared spectroscopy. The Raman spectrum is characterized by two intense broad bands at 997 and 1059 cm−1 assigned to the BO stretching vibrational mode. A series of Raman bands in the 1200–1500 cm−1 spectral range are attributed to BO antisymmetric stretching modes and in-plane bending modes. The infrared spectrum shows complexity in this spectral range. No Raman spectrum of water in the OH stretching region could be obtained. The infrared spectrum shows a series of overlapping bands with bands identified at 3037, 3245, 3443, 3556, and 3614 cm−1. It is important to understand the structure of vonsenite in order to form nanomaterials based on its structure. Vibrational spectroscopy enables a better understanding of the structure of vonsenite.
    Spectroscopy Letters 07/2014; 47(7).
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    ABSTRACT: Burkeite formation is important in saline evaporites and in pipe scales. Burkeite is an anhydrous sulphate-carbonate with an apparent variable anion ratio. Such a formula with two oxyanions lends itself to vibrational spectroscopy. Two symmetric sulphate stretching modes are observed, indicating at least at the molecular level the nonequivalence of the sulphate ions in the burkeite structure. The strong Raman band at 1065 cm−1 is assigned to the carbonate symmetric stretching vibration. The series of Raman bands at 622, 635, 645, and 704 cm−1 are assigned to the ν4 sulphate bending modes. The observation of multiple bands supports the concept of a reduction in symmetry of the sulphate anion from T d to C 3v or even C 2v.
    Spectroscopy Letters 07/2014; 47(7).

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