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.

Fourier transform Raman spectroscopic studies of human bone

Abstract: We have concluded preliminary investigations concerning the composition of human cortical bone tissue, and of a number of samples of synthetic hydroxyapatite, using Fourier transform Raman (FT-Raman) spectroscopy. Deproteination procedures to remove the bulk of the collagen present in the tissue have allowed isolation of the mineral phase, and a comparison of the spectra obtained from the latter with those of synthetic hydroxyapatites has highlighted a number of discrepancies. FT-Raman spectra obtained for whole, wet bone samples have produced a degree of spectral detail that is much improved upon that available from existing studies. This has mainly been achieved by the successful elimination of fluorescence from the tissue, a problem which has dogged the Raman analysis of bone in particular.

Characterization and application of dichroic filters in the 0.1-3-THz region

Abstract: Low-loss dichroic filters, a subgroup of frequency-selective components, have been characterized by terahertz time-domain spectroscopy in the region from 0.1 to 3 THz and with Fourier transform spectroscopy. The two data sets are fully consistent. The time-domain spectrometer is used to investigate the phase velocity behavior of dichroic filters. The dichroic filters have various applications in frequency mixing, multiplying, and diplexing experiments. In a novel application, cascaded filters were used to limit the terahertz pulse bandwidth and to monitor molecular transitions of atmospheric water vapor in a selected frequency band.

Infrared spectra of hydrogen dimers

Abstract: Weakly bound complexes of molecular hydrogen have been studied using an infrared Fourier transform spectrometer and a long absorption path (112 m) through equilibrium gas mixtures at temperatures ∼20 K Spectra of the dimers (H2)2, (HD)2, and (D2)2 were recorded, along with those of the mixed species H2–D2 and HD–D2 They lie in the 2900–8700 cm−1 (115–335 μm) spectral region corresponding to the monomer fundamental and first overtone bands Since the rotation and vibration of the monomers remain largely unperturbed in a dimer, each dimer band is centered around a monomer rotation–vibration transition The structure within these bands is associated with motions of the dimer as a whole, and particularly its end‐over‐end rotation, denoted by l The spectra are quite detailed and well resolved, especially for the heavier isotopes HD–D2, and (D2)2, and in many cases, their rotational structure can be fully assigned Although a detailed analysis is beyond the scope of the present paper, it should ultimately

Characterization of non-polar aromatic hydrocarbons in crude oil using atmospheric pressure laser ionization and Fourier transform ion cyclotron resonance mass spectrometry (APLI FT-ICR MS).

Abstract: We report on the successful application of the recently introduced atmospheric pressure laser ionization (APLI) method as a novel tool for the analysis of crude oil and its components. Using Fourier transform ion cyclotron resonance mass spectrometry, unambiguous determination of key compounds in this complex matrix with unprecedented sensitivity is presented.