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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 article, the use of optical fibers in an attenuated total reflectance type cell with an FTIR spectrometer was demonstrated for the first time, and the spectra of acetone in water and of glycine in water were acquired with the cell.
Abstract: Silver halide (AgCl:AgBr) fibers were used as the light conductor for total internal reflection measurements in a Fourier transform infrared (FTIR) spectrometer, to obtain spectra of aqueous solutions. The use of optical fibers in an attenuated total reflectance type cell with an FTIR spectrometer was demonstrated for the first time. Spectra of acetone in water and of glycine in water were acquired with the cell.
73 citations
TL;DR: In this article, the gas phase infrared spectrum of the BH3 ν3 band was observed in the 2600 cm−1 region by a Fourier transform infrared spectrometer.
Abstract: The gas‐phase infrared spectrum of the BH3 ν3 band was observed in the 2600 cm−1 region by a Fourier transform infrared spectrometer. The borane molecule was produced with a discharge in a B2H6 and He mixture. The spectral pattern was consistent with the D3h structure of borane. The observed spectrum between 2450–2730 cm−1 was analyzed to determine band origins, rotational constants, and centrifugal distortion constants. The ν3 band origins of 11BH3 and 10BH3 were 2601.5743(15) and 2615.7935(21) cm−1, respectively, with one standard deviation in parentheses. The B–H bond length was determined for the first time experimentally to be r0=1.190 01(1) A from the ground state rotational constant B0.
72 citations
TL;DR: In this article, single-crystal X-ray diffraction was used to identify functional groups of dl -malic acid-doped ammonium dihydrogen phosphate.
72 citations
TL;DR: The absorption and dispersion spectra of acetylene and methane have been measured, indicating that this OPO represents an ideal broadband mid-infrared source for fast chemical sensing.
Abstract: We present a femtosecond optical parametric oscillator (OPO) containing two magnesium-doped periodically poled lithium niobate crystals in a singly resonant ring cavity, pumped by two mode-locked Yb-fiber lasers. As such, the OPO generates two idler combs (up to 220 mW), covering a wavelength range from 2.7 to 4.2 μm, from which a mid-infrared dual-comb Fourier transform spectrometer is constructed. By detecting the heterodyning signal between the two idler beams a full broadband spectrum of a molecular gas can be observed over 250 cm−1 within 70 μs with a spectral resolution of 15 GHz. The absorption and dispersion spectra of acetylene and methane have been measured around 3000 cm−1, indicating that this OPO represents an ideal broadband mid-infrared source for fast chemical sensing.
72 citations
TL;DR: It is suggested that the combination of derivative and curve-fitting analysis may afford a sensitive evaluation of the maximum temperature reached, and thus contribute to the fossil-derived knowledge of human activities related to the use of fire.
Abstract: Derivative Fourier transform infrared (FTIR) spectroscopy and curve fitting have been used to investigate the effect of a thermal treatment on the ν
1
ν
3 PO4 domain of modern bones. This method was efficient for identifying mineral matter modifications during heating. In particular, the 961, 1022, 1061, and 1092 cm−1 components show an important wavenumber shift between 120 and 700 °C, attributed to the decrease of the distortions induced by the removal of CO3
2− and HPO4
2− ions from the mineral lattice. The so-called 1030/1020 ratio was used to evaluate crystalline growth above 600 °C. The same analytical protocol was applied on Magdalenian fossil bones from the Bize–Tournal Cave (France). Although the band positions seem to have been affected by diagenetic processes, a wavenumber index—established by summing of the 961, 1022, and 1061 cm−1 peak positions—discriminated heated bones better than the 1030/1020 ratio, and the splitting factor frequently used to identify burnt bones in an archaeological context. This study suggest that the combination of derivative and curve-fitting analysis may afford a sensitive evaluation of the maximum temperature reached, and thus contribute to the fossil-derived knowledge of human activities related to the use of fire.
72 citations