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: We have examined the effect of high temperature on single-wall carbon nanotubes under air and nitrogen ambient by Raman spectroscopy. We observe the temperature dependence of the radial breathing mode and the G-band modes. The thermal expansion coefficient (β) of the bundled nanotubes is obtained experimentally using the estimated volume from Raman scattering. β behaves linearly with temperature from 0.33 × 10−5 K−1 to 0.28 × 10−5 K−1 in air and from 0.58 × 10−5 K−1 to 0.47 × 10−5 K−1 in nitrogen ambient, respectively. The temperature dependence of the radial breathing mode Raman frequencies is consistent with a pure temperature effect.
    Spectroscopy Letters 02/2015; 48(2).
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    ABSTRACT: In the 0.1 mol · L−1 hydrochloric acid solution, oxymatrine reacted with tungstosilicic acid to form a 2:1 ion-association complexes. This results in a great enhancement of resonance Rayleigh scattering. The maximum resonance Rayleigh scattering wavelength was located at 393 nm. Resonance Rayleigh scattering intensity was proportional to the concentration of oxymatrine in the range of 1.5–26.4 µg · mL−1, and the detection limit (3σ) was 0.23 µg · mL−1. The optimum conditions and the effects of coexisting substances on the reaction were investigated. The method shows a wide linear range and high sensitivity, and was applied to the determination of oxymatrine in marine capsules and human urine samples with satisfactory results. Therefore, a highly sensitive, simple, and quick method has been developed for the determination of oxymatrine.
    Spectroscopy Letters 02/2015; 48(2).
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    ABSTRACT: It has been highly recognized that heavy metals and other trace species pollution concerns the environment, as well as human health. This paper describes the rapid detection of mercury and iodine using laser breakdown time-of-flight mass spectrometry at high sensitivity without partial fragmentation interference from other species. Two irradiation wavelengths 1064 and 532 nm were employed under various experimental conditions. The second harmonic 532 nm performs excellent measurement results. The influence of pressure on signal intensity displays a linear growth when increasing the pressure. The power dependence shows that as the laser power increased, mercury ion and iodine ion signal intensity increased first and then decreased. Experiment with different buffer gases clarified the recombination of mercury ion and iodine ion with electrons when increasing the laser power, resulting in the decrease of mercury ion and iodine ion signal intensity. Mercury ion signal intensity can be enhanced 3.8 times and the signal intensity of iodine ion can be enhanced 1.3 times employing 35 ps 532 nm breakdown. The detection limits (3σ/ms) of mercury ion and iodine ion signal using 35 ps laser breakdown were 0.82 ppb and 6.18 ppb, respectively.
    Spectroscopy Letters 02/2015; 48(2).
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    ABSTRACT: Priceite is a calcium borate mineral and occurs as white crystals in the monoclinic pyramidal crystal system. We have used a combination of Raman spectroscopy with complimentary infrared spectroscopy and scanning electron microscopy with Energy-dispersive X-ray Spectroscopy (EDS) to study the mineral priceite. Chemical analysis shows a pure phase consisting of B and Ca only. Raman bands at 956, 974, 991, and 1019 cm−1 are assigned to the BO stretching vibration of the B10O19 units. Raman bands at 1071, 1100, 1127, 1169, and 1211 cm−1 are attributed to the BOH in-plane bending modes. The intense infrared band at 805 cm−1 is assigned to the trigonal borate stretching modes. The Raman band at 674 cm−1 together with bands at 689, 697, 736, and 602 cm−1 are assigned to the trigonal and tetrahedral borate bending modes. Raman spectroscopy in the hydroxyl stretching region shows a series of bands with intense Raman band at 3555 cm−1 with a distinct shoulder at 3568 cm−1. Other bands in this spectral region are found at 3221, 3385, 3404, 3496, and 3510 cm−1. All of these bands are assigned to water stretching vibrations. The observation of multiple bands supports the concept of water being in different molecular environments in the structure of priceite. The molecular structure of a natural priceite has been assessed using vibrational spectroscopy.
    Spectroscopy Letters 02/2015; 48(2).
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    ABSTRACT: This paper presents a non-scanning Fourier transform spectrometer based on a micro-electronic mechanical system micro-mirrors and a single detector. The fundamental principle and key parameters of this Fourier transform spectrometer were analyzed in detail. Theoretical analysis showed that, when the dip angle of the slantwise mirror is 0.38713°, the resolution of the system is 9.7 nm (at 1350 nm). Experiments demonstrated that, the spectra resolution is less than 10 nm, the wavelength deviation is ∼1.5 nm, the signal-to-noise ratio is higher than 30 dB and the intensity deviation at peak wavelength is less than 0.4%.
    Spectroscopy Letters 02/2015; 48(2).
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    ABSTRACT: The cone beam computed tomography enables conducting measurement of length and area in the space where it is impossible to conduct such measurement compared to panorama. The cone beam computed tomography also enables making three-dimensional diagnosis and establishing treatment plan. In this experiment, the cone beam computed tomography was used to analyze image distortion of anatomical structure whose location was different between panorama and reconstructed panoramic image. Multiplanar reformation image was obtained after radiography of mandibular dentition. Then, the axial image was examined to obtain cross-sectional images of teeth that ranged from the right second molar to the left second molar before diameter of crown was measured and compared. Based on the cross-section that was radiographed by using the cone beam computed tomography, comparison was made between reconstructed panorama and standard panorama. According to the results of comparison, diameter of crown was measured with a slight difference of around 0.03 mm between the cone beam computed tomography cross-sectional image and the reconstructed image. It was also found that panorama caused image distortion with the large error of around 0.95 mm. Based on these results, it was confirmed that the cone beam computed tomography panorama that was reconstructed in consideration of patient's anatomical structure showed less distortion than the existing panorama. It was also confirmed that depending on distance, there was decrease in reliability of measurement of anatomical structure whose location was different in the existing panoramic image. It is necessary to develop methods and various programs in the future to improve poor image information that is obtained from the cone beam computed tomography and panorama examination.
    Spectroscopy Letters 02/2015; 48(2).
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    ABSTRACT: The authors present an external cavity diode laser with high spectral purity for tunable laser Raman spectroscopy. To achieve high spectral purity required for Raman spectroscopy, a laser cavity utilizing a volume phase holographic grating, which has very low stray light, is developed and the first-order diffracted beam from the grating is taken as the output. Raman signals can be obtained from common samples with only a commercial laser rejection filter, greatly simplifying a tunable Raman instrument.
    Spectroscopy Letters 02/2015; 48(2).
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    ABSTRACT: In order to cluster and identify 10 varieties of Chuxiong population of Camellia reticulata Lindl., the difference of DNA among the 10 varieties was detected by using Fourier transform infrared spectroscopy (FTIR), and then hierarchical cluster and principal component analysis based on average spectra of DNA was used to establish standard clustering and identifying model. The result indicated that (1) DNA fingerprints based on FTIR of the 10 varieties are different from each other, which is also supported by variance analysis (p C. reticulata Lindl., and can be used to calculate the origin of ancient Camellia tree.
    Spectroscopy Letters 02/2015; 48(2).
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    ABSTRACT: The dependence of surface-enhanced fluorescence of the semiconducting polymer poly (3-hexylthiophene) on the diameter of silver nanoparticles was studied. Particle suspensions with a high degree of monodispersity, ranging in diameter from 15 to 153 nm, were synthesized. Polymer films were spin-cast onto substrates containing immobilized silver particles. Fluorescence enhancement factors ranged from 0.9 to 4.9 and generally improved with increasing particle size. Normalization of the fluorescence enhancement to the number of interrogated particles showed an 800-fold increase in enhancement between the smallest and largest particles.
    Spectroscopy Letters 02/2015; 48(2).
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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: 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: 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: 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: 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: 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: 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: 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).