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.
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TL;DR: In this paper, a newly built infrared spectrometer is used for vibrational studies at the electrochemical interface, which is achieved by using a slow scan speed (∼6 μm) s−1 for the Michelson interferometer.
Abstract: We report on a newly built infrared spectrometer to be used for vibrational studies at the electrochemical interface. The usual way to select the weak interface absorption consists in changing the electrode potential and measuring the associated change in absorption. However, up to now it was difficult to benefit from both the advantages of using a lock‐in detection and Fourier transform spectroscopy. Our apparatus allows simultaneous use of these two techniques. This is achieved by using a slow scan speed (∼6 μm s−1) for the Michelson interferometer. The electrode potential may be modulated at a frequency as low as 100 Hz. The ultimate sensitivity of our apparatus corresponds to a relative change of transmitted light intensity of ΔI/I∼10−6, for a measuring time of 45 min, in the 800–4200 cm−1 range, with a resolution of 25 cm−1. Our ultimate resolution capability is 0.5 cm−1. Data are presented that have been obtained on the n‐Si/acetonitrile interface using an attenuated total reflection geometry, which...
37 citations
TL;DR: In this article, the infrared spectra of HBr and HCl on LiF(001) single crystal surfaces were measured as a function of coverage at temperatures ≤83 K using Fourier transform infrared (FTIR) spectroscopy.
Abstract: The infrared spectra of HBr and HCl on LiF(001) single crystal surfaces were measured as a function of coverage at temperatures ≤83 K using Fourier‐transform infrared (FTIR) spectroscopy. For each hydrogen halide three different spectral features could be distinguished. At low coverages broad absorptions centered at 2265±20 cm−1 (HBr) and at 2515±20 cm−1 (HCl) were observed. These absorptions were attributed to molecules hydrogen‐bonded to F− anions of the surface, the angle between the molecular axis and the surface being 21±5° for HBr and 19±5° for HCl as determined from experiments employing polarized infrared radiation. Hydrogen bonding was evidenced by: (i) redshifts with respect to the gas phase (∼300 cm−1), (ii) broad infrared absorption (FWHM: 265±25 cm−1 for HBr, 295±15 cm−1 for HCl), and (iii) enhancement of the infrared absorption intensity compared to the gas phase by more than one order of magnitude for both HBr and HCl. With increasing coverage a second absorption was observed before the fir...
37 citations
TL;DR: In this paper, the Fourier transform intra-cavity laser absorption spectroscopy (FT-ICLAS) was used to record the νOD=5 stretching overtone of HOD at a resolution of 0.05 cm-1 in the region 12550-12900 cm 1.
Abstract: The newly developed high resolution Fourier-transform intra-cavity laser absorption spectroscopy (FT-ICLAS) was utilized to record the νOD=5 stretching overtone of HOD at a resolution of 0.05 cm-1 in the region 12550–12900 cm-1. The spectrum was rotationally analysed and the spectroscopic parameters were derived from nonlinear least-squares fitting. Good agreement of the observed with the calculated energy levels was achieved.
37 citations
TL;DR: In this article, a segmented Fourier transform (SEFT) was proposed to analyze quantitatively the frequency components of digitized time-domain signals, which enables accurate ion abundance and mass measurements to be made.
37 citations
TL;DR: In this paper, phase error is corrected by multiplying the inverse transform of the measured interferogram by e−iϕ(ω), where ϕ is the phase error in the spectrum.
Abstract: The correction of phase error in Fourier transform spectroscopy is discussed. Phase error is corrected by multiplying the inverse transform of the measured interferogram by e−iϕ(ω), where ϕ(ω) is the phase error in the spectrum. This error is determined from a low-resolution, two-sided interferogram. It is absolutely essential that the truncation-apodization function which multiplies the interferogram have an even part which is symmetric about the x=0 position. If this function is not properly located, large errors in the corrected spectrum can occur.
37 citations