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Laser-induced grating spectroscopy of highly excited overtone and combination vibrational states of methane

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2013
Author Kozlov D. N., Sadovskii D. A., Radi P. P.,
Project Spectroscopic Characterization of Radicals by Degenerate and Two-Color Resonant Four-Wave Mixing
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Original article (peer-reviewed)

Journal JOURNAL OF MOLECULAR SPECTROSCOPY
Volume (Issue) 291
Page(s) 23 - 32
Title of proceedings JOURNAL OF MOLECULAR SPECTROSCOPY
DOI 10.1016/j.jms.2013.04.005

Abstract

Laser-induced grating spectroscopy is applied to investigate weak overtone and combination absorption bands of methane. The rotationally-resolved spectra of transitions to the polyads Pn, n = 8–10, 12 recorded at pressures ranging from 0.2 to 4 bar and temperatures 298 K and 124–130 K cover a broad interval between 891 and 618 nm (11 220–16 180 cm−1) and contain a significant amount of prominent narrow lines which correspond to stationary rovibrational states. The absorption cross sections of the weakest detected methane transitions are estimated to be as small as ≈10−26 cm2 molecule−1. The technique is suitable to provide data for the development and verification of new models describing the complex energy structure of highly vibrationally excited molecules
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