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Time‐Resolved FTIR Emission Spectroscopy of Transient Radicals
Author(s) -
Letendre Laura T.,
McNavage William,
Pibel Charles,
Liu DingKuo,
Dai HaiLung
Publication year - 2005
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200500095
Subject(s) - chemistry , radical , excited state , spectroscopy , fourier transform spectroscopy , spectral line , photodissociation , fourier transform , analytical chemistry (journal) , fourier transform infrared spectroscopy , emission spectrum , infrared spectroscopy , photochemistry , atomic physics , optics , organic chemistry , mathematical analysis , physics , mathematics , quantum mechanics , astronomy
Abstract Fourier Transform spectroscopy with 10 −8 second time resolution for recording IR emission spectra has been developed as an efficient means for detecting previously unknown vibrational modes of transient radicals. 193 nm photodissociation of a precursor molecule is used to generate vibrationally excited radicals, from which IR emission is recorded with time and spectral resolution. Assignment of the spectra is performed using information obtained through multiple precursors, isotopic substitution, time dependence of emission intensity, theoretical calculations, and 2‐dimensional cross‐spectra correlation analysis. The radicals vinyl, cyanovinyl, and OCCN have been studied with many vibrational modes identified.