Topic
Fourier transform spectroscopy
About: Fourier transform spectroscopy is a research topic. Over the lifetime, 5418 publications have been published within this topic receiving 134133 citations.
Papers published on a yearly basis
Papers
More filters
••
TL;DR: In this paper, the ground-state rotational spectrum of a dimer of ammonia and hydrogen bromide has been detected by using the technique of Fourier transform microwave spectroscopy in a Fabry-Perot cavity to examine a supersonically expanded gas pulse composed of ammonium-bromide vapor entrained in argon.
Abstract: The ground‐state rotational spectrum of a dimer of ammonia and hydrogen bromide has been detected by using the technique of Fourier‐transform microwave spectroscopy in a Fabry–Perot cavity to examine a supersonically expanded gas pulse composed of ammonium bromide vapor entrained in argon. The spectroscopic constants B0, DJ, DJK, χ(14N), χ(79Br), and χ(81Br) have been determined (where appropriate) for the four symmetric‐top type isotopic species (14NH3, H79Br), (14NH3, H81Br), (15NH3, H79Br), and (15NH3, H81Br) and for the first of these the values are as follows: B0=3226.862(1) MHz, DJ=9.0(2) kHz, DJK=142.2(6) kHz, χ(14N)=−3.183(8) MHz, and χ(79Br)=361.245(6) MHz. The spectroscopic constants have been interpreted in terms of a hydrogen‐bonded dimer of C3v symmetry, having r(N⋅⋅⋅Br)=3.255 A and the hydrogen‐bond stretching force constant kσ=13.4 N m−1. A detailed analysis has demonstrated that χ(79Br) is consistent with a model of the dimer in which only a small electrical rearrangement in the HBr subuni...
59 citations
••
TL;DR: The current status of reflection-absorption infrared spectroscopy (RAIRS) is reviewed with examples illustrating its application to studies of structural chemical transformations at surfaces in this article, and the prospects for the future are briefly discussed including the use of synchrotron and laser i.r. sources.
59 citations
••
TL;DR: Air-broadened and N(2)-broadened halfwidth and pressure shift coefficients of 294 transitions in the nu(4) and nu(2) bands of (12)CH(4), measured from laboratory absorption spectra recorded at room temperature with the Fourier transform spectrometer in the McMath solar telescope facility of the National Solar Observatory.
Abstract: Air-broadened and N2-broadened halfwidth and pressure shift coefficients of 294 transitions in the nu4 and nu2 bands of C-12H4 have been measured from laboratory absorption spectra recorded at room temperature with the Fourier transform spectrometer in the McMath solar telescope facility of the National Solar Observatory. Total pressures of up to 551 Torr were employed with absorption paths of 5-150 cm, CH4 volume mixing ratios of 2.6 percent or less, and resolutions of 0.005 and 0.01/cm. A nonlinear least-squares spectral fitting technique has been utilized in the analysis of the twenty-five measured spectra. Lines up to J double-prime = 18 in the nu4 band and J double-prime = 15 in the nu2 band have been analyzed.
59 citations
••
TL;DR: In this article, a tilt-compensated triple-pass system for use with previously built Fourier spectrometers to increase the resolution by 3 is described. But the resulting width of the apparatus function of the third-generation interferometer is better than 10−3 cm−1 and can be meaningfully expressed in frequency units.
Abstract: The contribution of the third-generation Fourier spectrometer, built at the Laboratoire Aime Cotton and currently at the Laboratoire d'Infrarouge, to meteorological and high resolution Doppler-limited measurements is reported citing typical examples and the latest instrumental improvements. A tilt-compensated triple-pass system for use with previously built Fourier spectrometers to increase the resolution by 3 is described. The resulting width of the apparatus function of the triple-pass third-generation interferometer is better than 10−3 cm−1 and can be meaningfully expressed in frequency units. Its actual value is 27 MHz. For the first time a spectrometer is able to give very wide spectral range information with a resolving power sufficient to analyze sub-Doppler spectra.
59 citations
••
01 Jan 2003
TL;DR: In this paper, an extensive cross-sections dataset from 42000 to 7500 cm−1 (238-1330 nm) is presented, and a preliminary test on the influence of the choice of the dataset on atmospheric retrievals of O2, O3, BrO and OClO is performed.
Abstract: Collision-induced absorption (CIA) cross-sections of oxygen have been measured in the UV, Visible and near-IR regions from spectra recorded by Fourier Transform Spectroscopy at different pressures and room temperature. An extensive cross-sections dataset from 42000 to 7500 cm−1 (238–1330 nm) is presented. The separation procedure of the discrete and diffuse absorption features is described. Pressure and foreign gas effects are discussed, and a comparison with literature data is shown. A preliminary test on the influence of the choice of the dataset on atmospheric retrievals of O2, O3, BrO, and OClO is performed.
59 citations