Science method

Spectroscopy - Science method

Spectroscopy is the theoretical and experimental study of the interaction between matter and radiated energy.
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Publications related to Spectroscopy (10,000)
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Article
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Highly efficient Fe ³⁺ -activated Sr 2- y Ca y (InSb) 1- z Sn 2 z O 6 broadband near-infrared-emitting phosphors with tunable emission from 885 to 1005 nm are developed as alternative for primarily studed toxic Cr ³⁺ -activated near-infrared-emitting phosphors for application in spectroscopy analysis.
Article
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Graph neural networks are attractive for learning properties of atomic structures thanks to their intuitive graph encoding of atoms and bonds. However, conventional encoding does not include angular information, which is critical for describing atomic arrangements in disordered systems. In this work, we extend the recently proposed ALIGNN (Atomisti...
Article
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In these introductory notes I give a brief overview on some theoretical aspects of light baryon spectroscopy. The first part contains a discussion of the symmetries of the baryon spectrum, the construction of flavor wave functions and some basic features of quark models. The second part examines the need for relativistic quantum field theory and fo...
Article
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Afterglows of mixed gas of N 2 and H 2 (0–2.5%) flowing microwave discharges in a 5 mm diameter tube connected to a 5 L reactor via a tube of 1.8 cm diameter and 50 cm long, have been studied using optical emission spectroscopy. The obtained results at the entrance of the afterglow tube of 1.8 cm diameter: Short time afterglow (SA), (10 –3 s) and i...
Article
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Nuclei surrounding single electron spins are valuable resources for quantum technology. For application in this area, one is often interested in weakly coupled nuclei with coupling strength on the order of a few 10–100 kHz. In this paper, we compare methods to address single nuclear spins with this type of hyperfine coupling to a single electron sp...
Conference Paper
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PAPER ID: 3752782; PAPER TITLE: Porphyrin-surfactant interactions in aqueous solutions studied by UV-vis spectroscopy, dynamic light scattering and spin probe EPR spectroscopy; [SYMPOSIUM NAME: PHYS - Division of Physical Chemistry].
Article
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Hollow nanoreactors show great potential in catalysis due to the void‐confinement effect. Yet few studies have investigated the void‐confinement effect of hollow nanoreactors on intermediates. Herein, electrochemical NO reduction to NH3 (ENOR) is used as a probe reaction to study the void‐confinement effect of hollow Cu2O@CoMn2O4 nanoreactors on in...
Preprint
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In the past few years, there is a renewed interest in using multimode fibers for a wide range of technologies such as communication, imaging and spectroscopy. Practical implementations of multimode fiber in such applications, however, are held back, due to the challenges in dealing with modal dispersion, mode coupling and the fiber's sensitivity to...
Preprint
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In this work we have studied the limitations of the TXRF spectroscopy in the upper limit of validity of the technique, when the analyzed specimen ceases to be a thin film. We have evaluated the non-linear effects in spectra obtained from samples made ad-hoc, which were acquired in a pre-established sequence of dilutions. So, the spectra were obtain...
Article
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The aging and photobleaching effects on the acid Fuchsin dye with different concentrations in the absence and the presence of poly(vinyl alcohol) were investigated. For studying the aging effect of the samples, the optical absorption properties were characterized by UV–Vis spectroscopy. Also, the photoluminescence spectrum of the samples was measur...
Article
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In this study, single-particle electrode technique is adopted to measure the impedance response of SiOx materials for the first time. The electrochemical impedance spectroscopies of two SiOx particles are measured at different insertion ratios and different temperatures. Two kinetic parameters, namely Li⁺ diffusivity and exchange current density, a...
Article
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C is one of the most important radioactive isotopes in the nuclear industry. Laser spectroscopy is being considered as a convenient and rapid method for ¹⁴CO2 analysis. Here, we demonstrate off-axis integrated cavity output spectroscopy (OA-ICOS) for monitoring ¹⁴CO2. The experiment is performed at the ¹⁴CO2 absorption line at 2203.657 cm⁻¹ in the...
Article
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The upper limit of sensitivity enhancement in a multipass process was investigated. In the calculation of 3.7×1013 ray-trace analysis, the sensitivity enhancement was increased to 13,510 for the mirror diameter of 75 mm with the mirror diameter. In the experiment, the sensitivity was enhanced by a factor of 1790 ± 160 for an effective mirror diamet...
Preprint
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Determining the pairing symmetry of single-layer FeSe on SrTiO$_3$ is the key to understanding the enhanced pairing mechanism; furthermore, it guides exploring new superconductors with high transition temperatures ($T_\mathrm{c}$). Despite significant efforts, it remains controversial whether the symmetry is the sign-preserving $s$- or the sign-cha...
Article
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A near‐infrared methane (CH4) and ethane (C2H6) dual‐gas sensor system based on off‐axis integrated cavity output spectroscopy was demonstrated. Simultaneous detection of CH4 and C2H6 was performed using two distributed feedback laser diodes with central wavelengths of 1654 and 1680 nm by time division multiplexing (TDM). TDM of the two lasers was...
Preprint
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Intensities of lines in the near-infrared second overtone band (3--0) of $^{12}$C$^{16}$O are measured and calculated to an unprecedented degree of precision and accuracy. Agreement between theory and experiment to better than 1 $\permil$ is demonstrated by results from two laboratories involving two independent absorption- and dispersion-based cav...
Article
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The formation, properties, decomposition and reactions of ethoxy groups on ZrO2, CuO, and CuO/ZrO2 were followed by IR spectroscopy. The reaction of ethanol with terminal Zr-OH groups leads to the formation of monodendate ethoxy groups (type I), whereas the reaction of ethanol with tribridged Zr-OH grups results in the formation of bidendate ethoxy...
Article
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Nanocomposite photocatalysts AgI-TiO 2 and AgO-TiO 2 were successfully synthesized by thermolysis method at 200°C/2 h. The composite photocatalysts were characterized by XRD, TEM and UV-Vis spectroscopy. The Efficiency of AgI-TiO 2 and AgO-TiO 2 photocatalysts in comparison with pure TiO 2 (P25) was tested by the photocatalytic degradation of Remaz...
Preprint
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Electron-lattice coupling effects in low dimensional materials give rise to charge density wave (CDW) order and phase transitions. These phenomena are critical ingredients for superconductivity and predominantly occur in metallic model systems such as doped cuprates, transition metal dichalcogenides, and more recently, in Kagome lattice materials....
Preprint
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Terahertz time-domain spectroscopy systems based on resonator-internal repetition-rate modulation, such as SLAPCOPS [12] and ECOPS [11], rely on electronic phase detectors which are typically prone to exhibit both a non-negligible random and systematic timing error. This limits the quality of the recorded information significantly. Here, we present...
Preprint
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Ultraviolet-visible (UV-Vis) spectroscopy was used to measure the optical absorption and emission from high-quality, 2-inch AlN substrates grown by physical vapor transport (PVT). Spatially uniform UV absorption coefficients below 20 cm-1 at 4.68 eV (265 nm) were demonstrated. The complementary spectroscopic data were used to elucidate the mechanis...
Preprint
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Kagome magnet TbMn$_6$Sn$_6$ is a new type of topological material that is known to support exotic quantum magnetic states. Experimental work has identified that TbMn$_6$Sn$_6$ hosts Dirac electronic states that could lead to topological and Chern quantum phases, but the optical response of the Dirac fermions of TbMn$_6$Sn$_6$ and its properties re...
Article
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Portable laser induced breakdown spectroscopy (pLIBS) is an analytical method for determining the elemental composition of solid material surfaces. Field-portable devices are gaining increasing acceptance in the mineral resources sector, offering rapid, on-site chemical analysis.
Preprint
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The ESA/KU Leuven CubeSpec mission is specifically designed to provide low-cost space-based high-resolution optical spectroscopy. Here we highlight the science requirements and capabilities of CubeSpec. The primary science goal is to perform pulsation mode identification from spectroscopic line profile variability and empower asteroseismology of ma...
Preprint
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Quasiparticle excitations provide viable information on the physics of unconventional superconductors. Higgs and Leggett modes are some of the brightest examples. Another important bosonic excitation is the spin exciton originating from the sign-changing superconducting gap structure. Here we report a direct observation of the temperature-dependent...
Preprint
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We measure the hyperfine structure of $nP_{1/2}$ Rydberg states using mm-wave spectroscopy on an ensemble of laser-cooled $^{85}$Rb atoms. Systematic uncertainties in our measurement from the Zeeman splittings induced by stray magnetic fields and dipole-dipole interactions between two Rydberg atoms are factored in with the obtained statistical unce...
Article
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Protein interaction studies often require very low concentrations and highly sensitive biophysical methods. Here, we demonstrate that pulse dipolar electron paramagnetic resonance spectroscopy allows measuring dissociation constants in the nanomolar...
Preprint
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We report an experiment to measure the femtosecond electric field of the signal emitted from an optical third-order nonlinear interaction in carbon dioxide molecules. Using degenerate four-wave mixing with femtosecond near infrared laser pulses in combination with the ultra-weak femtosecond pulse measurement technique of TADPOLE, we measure the non...
Article
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Several techniques exist that use a thermoelectric element (TE) or module (TM) to measure precise dimensionless figure of merit (zT), both qualitatively and quantitatively. The techniques can be applied using both alternating (AC) and direct current (DC). Herein, the transient Harman (TH) and impedance spectroscopy (IS) methods were investigated as...
Article
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We propose and discuss an effective tool for substance detection and identification using a broadband THz pulse that is based on frequency conversion near the substance absorption frequencies. With this aim, we analyze the evolution of spectral intensities at the doubled absorption frequencies in order to prove their similarity to those at which th...
Preprint
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We report the synthesis and characterization of a Si-based ternary semiconductor Mg$_3$Si$_2$Te$_6$, which exhibits a quasi-two-dimensional structure, where the trigonal Mg$_2$Si$_2$Te$_6$ layers are separated by Mg ions. Ultraviolet-visible absorption spectroscopy and density functional theory calculations were performed to investigate the electro...
Preprint
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When collecting spectroscopic data on at least four isotopes, nonlinearities in the King plot are a possible sign of Physics beyond the Standard Model. In this work, an improved approach to the search for hypothetical new interactions with isotope shift spectroscopy of few-electron ions is presented. Very careful account is taken of the small nucle...
Article
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A focus-offset collinear dual-pulse laser-induced breakdown spectroscopy (FOC-DP-LIBS) is designed and used to investigate the laser ablation and spectral intensity with an aluminum alloy sample. The laser crater morphologies and ablation volumes were measured. An inter pulse time delay dependent ablation efficiency on a nanosecond laser heated sam...
Article
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Single-walled carbon nanotubes (SWCNT) have long attracted attention due to their distinct physical properties, depending on their chiral structures (chiralities). Clarifying their growth mechanism is important toward perfect chirality-controlled bulk synthesis. Although a correlation between the chirality distribution and the carbon atom configura...
Poster
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Yittrium Orthosilicate (Y 2 SiO 5) doped rare-earth ion solid state crystals have been explored in recent times for quantum information processing applications. In this work, laser site-selective spectroscopy results-emission, excitation and lifetime are presented. Preliminary crystal-field calculations were done in the context of Zeeman-hyperfine...
Thesis
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A technology for producing foams based on polyacrylamide copolymer has been developed. The influence of modifiers on the chemical structure of gas-filled materials is analyzed using FTIR spectroscopy. The influence of modifiers on the physical, mechanical and thermal properties of foams has been studied.
Preprint
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We study the quasiparticle interference (QPI) pattern emanating from a pair of adjacent impurities on the surface of a gapped superconductor (SC). We find that hyperbolic fringes (HF) in the QPI signal can appear due to the loop contribution of the two-impurity scattering, where the location of the two impurities are the hyperbolic focus points. Fo...
Poster
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Photoelectron emission yield spectroscopy (PEYS) is a widely used method to determine the ionization energy of a material. The photoelectron yield spectrum shift can be observed after repeated measurements when studying electrically conductive metal oxides like FTO and ITO. Additionally, the magnitude of the signal increases. Previous studies have...
Poster
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In this study we aimed to obtain biologically active pyrazole-4-carbaldehyde derivatives (1-3) by Vilsmeier–Haack reaction, combine them with 1,10-phenanthroline, and synthesize of new supramolecular imidazole derivatives (5-7) by Condensation reaction, investigation of their photophysical properties by UV-Vis spectroscopy, characterized some spect...
Article
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During viral cell entry, the spike protein of SARS‐CoV‐2 binds to the α1‐helix motif of human angiotensin‐converting enzyme 2 (ACE2). Thus, alpha‐helical peptides mimicking this motif may serve as inhibitors of viral cell entry. For this purpose, we employed the rigidified diproline‐derived module ProM‐5 to induce α‐helicity in short peptide sequen...
Article
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Pengembangan metode sederhana, tidak beracun dan ramah lingkungan untuk preparasi nanopartikel merupakan langkah penting dalam bidang nanoteknologi. Di antara nanopartikel logam, nanopartikel perak (AgNPs) mendapatkan banyak perhatian karena sifat dan aplikasi kimia, fisik dan biologinya. Review ini membahas beberapa publikasi ilmiah di area green...
Article
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The differential XAFS technique holds promise for detecting surface changes, which benefits many chemical applications. Phase-sensitive detection (PSD) analysis based on modulated excitation spectroscopy experiments is expected to obtain a high-quality difference spectrum, while the mathematical relationship and experiment parameters remain to be d...
Article
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Review ini membahas beberapa publikasi ilmiah di area sintesis nanopartikel ZnO dengan metode solvotermal dan aplikasinya. Dalam studi ini, aplikasi sintesis, sifat dan karakterisasi dibahas menggunakan berbagai teknik seperti Mikroskop elektron transmisi, analisis difraksi sinar-X, spektroskopi UV–Visible, dan mikroskop elektron pemindaian. Nanopa...
Article
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We report the terahertz optical properties of vanadium doped (100) β-Ga 2 O 3 using terahertz time-domain spectroscopy (THz-TDS). The V-doped β-Ga 2 O 3 crystal shows strong birefringence in the 0.2-2.4 THz range. Further, phase retardation by the V-doped β-Ga 2 O 3 has been measured over the whole THz range by terahertz time-domain polarimetry (TH...
Preprint
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The $e^+e^-\to \omega\eta$ and $e^+e^-\to\omega\pi^0\pi^0$ processes are ideal platforms to search for higher $\omega$ states. Focusing on the observations of two enhancement structures around 2.2 GeV existing in $e^+e^-\to \omega\eta$ and $e^+e^-\to\omega\pi^0\pi^0$ at BESIII, we analyze how the $\omega(4S)$ and $\omega(3D)$ states play the role i...
Article
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Octacalcium phosphate (OCP) belongs to a family of calcium phosphate compounds. OCP has unique crystal-chemical properties; among calcium phosphate compounds, only OCP can incorporate carboxylate ions into its crystal lattice. An OCP with incorporated carboxylate ions is called an OCP carboxylate (OCPC). OCPCs are investigated for applications in n...
Article
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Penelitian ini bertujuan untuk mengetahui kelayakan dari air minum isi ulang yang berada di Kecamatan Depok, Sleman, Yogyakarta berdasarkan Peraturan Menteri Kesehatan Nomor 492/MENKES/PER/IV/2010. Dalam penelitian ini, peneliti menggunakan metode deskriptif berdasarkan uji laboratorium. Teknik pengambilan sampel dilakukan dengan cara purposive sam...
Article
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O-PTIR was used for simultaneous collection of infrared and Raman spectra from clinical pathogens associated with bloodstream infections.