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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: This work presents a first implementation of optical-frequency-comb-based rapid trace gas detection in the molecular fingerprint region in the mid-infrared and achieves part-per-billion detection limits in 30 seconds of integration time for several important molecules.
Abstract: We present a first implementation of optical-frequency-comb-based rapid trace gas detection in the molecular fingerprint region in the mid-infrared Near-real-time acquisition of broadband absorption spectra with 00056 cm(-1) maximum resolution is demonstrated using a frequency comb Fourier transform spectrometer which operates in the 2100-to-3700-cm(-1) spectral region We achieve part-per-billion detection limits in 30 seconds of integration time for several important molecules including methane, ethane, isoprene, and nitrous oxide Our system enables precise concentration measurements even in gas mixtures that exhibit continuous absorption bands, and it allows detection of molecules at levels below the noise floor via simultaneous analysis of multiple spectral features
241 citations
TL;DR: A permanent on-axis dispenser cathode electron source inside the magnet bore of a 9.4-T Fourier transform ion cyclotron resonance mass spectrometer allows electron capture dissociation (ECD) to be performed reliably on a millisecond time scale and an off-axis laser geometry is implemented that enables simultaneous access to ECD and infrared multiphoton Dissociation (IRMPD).
Abstract: We have mounted a permanent on-axis dispenser cathode electron source inside the magnet bore of a 9.4-T Fourier transform ion cyclotron resonance mass spectrometer. This configuration allows electron capture dissociation (ECD) to be performed reliably on a millisecond time scale. We have also implemented an off-axis laser geometry that enables simultaneous access to ECD and infrared multiphoton dissociation (IRMPD). Optimum performance of both fragmentation techniques is maintained. The analytical utility of performing either ECD or IRMPD on a given precursor ion population is demonstrated by structural characterization of several posttranslationally modified peptides: IRMPD of phosphorylated peptides results in few backbone (b- and y-type) cleavages, and product ion spectra are dominated by neutral loss of H3PO4. In contrast, ECD provides significantly more backbone (c- and z•-type) cleavages without loss of H3PO4. For N-glycosylated tryptic peptides, IRMPD causes extensive cleavage of the glycosidic bo...
239 citations
TL;DR: It is concluded that in the gel phase, at all temperatures below the main transition, the acyl chains are predominantly in all-trans conformations and that the temperature-dependent variations of spectral parameters result from changes in interchain interactions.
Abstract: Fourier transform infrared spectroscopy has been used to study the infrared-active acyl chain vibrational modes of fully hydrated multibilayers of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (L-DPPC) over the temperature range 0-55 degrees C. Frequencies, bandwidths, and other spectral parameters were measured as a function of temperature for the methylene scissoring, rocking, and wagging modes, as well as for the C-H stretching modes, and they were used to monitor the packing of the acyl chains. Particular emphasis was placed on determining the nature of the pretransition event. It is shown that between 36 and 38 degrees C the spectral changes are indicative of a phase change in the acyl chain packing from an orthorhombid to a hexagonal subcell. It is also concluded that in the gel phase, at all temperatures below the main transition, the acyl chains are predominantly in all-trans conformations and that the temperature-dependent variations of spectral parameters result from changes in interchain interactions.
235 citations
TL;DR: In this paper, the authors describe the implementation of time-resolved step-scan FT-IR spectroscopy with a commercial interferometer, with the use of the photoreaction of the biological system bacteriorhodopsin.
Abstract: The implementation of time-resolved step-scan FT-IR spectroscopy with a commercial interferometer is described. With the use of the photoreaction of the biological system bacteriorhodopsin as an example which exhibits infrared spectral changes smaller than 10−2 absorbance units, the quality of the method is demonstrated. A comparison with conventional flash-photolysis experiments with a monochromatic infrared monitoring beam clearly demonstrates the multiplex advantage. The advantage of covering the total time course of the reaction allows for a variety of data analysis, such as forming difference spectra between intermediates of the reaction and the deduction of time courses of absorbance changes at selected wavenumbers. The mirror stability is better than ±1.5 nm, which is sufficient for the reliable measurement of small absorbance changes.
229 citations
Book•
28 Dec 1989
TL;DR: In this paper, Fourier Transform Spectrometry (FT-Spectrometry) is used to derive the line shape derived from the motion of a Damped Mass on a Spring, which is then used for spectral line shape estimation.
Abstract: 1. Spectral Line Shape Derived from the Motion of a Damped Mass on a Spring. 2. Fourier Transforms for Analog (Continuous) Waveforms. 3. Fourier Transforms of Digital (Discrete) Waveforms. 4. Fourier Transform Spectrometry: Common Features. 5. Noise. 6. Non-FT Methods for Proceeding from Time- to Frequency-Domain. 7. Fourier Transform Ion Cyclotron Resonance Mass Spectrometry. 8. FT/NMR. 9. FT/Interferometry. 10. Epilog: Fourier Transforms in Other Types of Spectroscopy. References. Problems (at the end of each chapter). Solutions to problems. Appendices. Index.
223 citations