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: An analytical form for resonance lineshapes in two-dimensional (2D) Fourier transform spectroscopy is derived from the solution of the optical Bloch equations for a two-level system in the 2D time domain.
Abstract: We derive an analytical form for resonance lineshapes in two-dimensional (2D) Fourier transform spectroscopy. Our starting point is the solution of the optical Bloch equations for a two-level system in the 2D time domain. Application of the projection-slice theorem of 2D Fourier transforms reveals the form of diagonal and cross-diagonal slices in the 2D frequency data for arbitrary inhomogeneity. The results are applied in quantitative measurements of homogeneous and inhomogeneous broadening of multiple resonances in experimental data.
131 citations
TL;DR: In this article, the water vapor continuum absorption spectrum was investigated using Fourier transform spectroscopy (FTS) and the absorption coefficient as a function of frequency was determined and compared with theoretical predictions and available water vapor absorption data.
Abstract: The water vapor continuum absorption spectrum was investigated using Fourier Transform Spectroscopy. The transmission of broadband terahertz radiation from 0.300 to 1.500 THz was recorded for multiple path lengths and relative humidity levels. The absorption coefficient as a function of frequency was determined and compared with theoretical predictions and available water vapor absorption data. The prediction code is able to separately model the different parts of atmospheric absorption for a range of experimental conditions. A variety of conditions were accurately modeled using this code including both self and foreign gas broadening for low and high water vapor pressures for many different measurement techniques. The intensity and location of the observed absorption lines were also in good agreement with spectral databases. However, there was a discrepancy between the resonant line spectrum simulation and the observed absorption spectrum in the atmospheric transmission windows caused by the continuum absorption. A small discrepancy remained even after using the best available data from the literature to account for the continuum absorption. From the experimental and resonant line simulation spectra the air-broadening continuum parameter was calculated and compared with values available in the literature.
131 citations
TL;DR: In this article, the advantages and disadvantages of photoacoustic detection are discussed, and comparisons of sample spectra obtained by different techniques, including photoacoustical detection, are presented and compared.
Abstract: Fourier transform infrared spectroscopy of solids and liquids using photoacoustic detection is reported here. The advantages and disadvantages of photoacoustic detection are discussed, and comparisons of sample spectra obtained by different techniques, including photoacoustic detection, are presented and compared. Photoacoustic Fourier transform infrared spectroscopy is a promising spectroscopic method for IR analysis in cases where sample preparation is difficult.
131 citations
TL;DR: In this article, subtractively normalized interfacial Fourier transform infrared spectroscopy applied to the in situ study of the electrode-electrolyte solution interphase is presented, which is used to obtain difference infrared spectra of electrogenerated intermediates and species adsorbed at the electrode surface.
130 citations
TL;DR: In this paper, a new coordination polymer based on an aromatic carbonyl ligand is prepared and investigated as a positive active material for lithium ion batteries, namely, [Li2(C6H2O4)] (1).
Abstract: A new coordination polymer based on an aromatic carbonyl ligand is prepared and investigated as a positive active material for lithium ion batteries, namely, [Li2(C6H2O4)] (1). It is synthesized by the dehydration of [Li2(C6H2O4)·2H2O] (2). These compounds are characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), elemental analysis (EA), single crystal X-ray diffraction methods and powder X-ray diffraction (XRD). As positive material, compound 1 has an initial discharge capacity of 176 mAh·g−1 and a columbic efficiency of 93.18% in the first cycle. It might provide a new method for finding new positive-electrode materials in lithium ion batteries.
129 citations