Infrared spectra of acetylene-water complexes: C₂D₂-H₂O, C₂D₂-HDO, and C₂D₂-D₂O

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• 作者：Mojtaba Rezaei^a ; N. Moazzen-Ahmadi^a ; ^{ahmadi@phas.ucalgary.ca} ; A.R.W. McKellar^b ; ^{robert.mckellar@nrc-cnrc.gc.ca}
• 关键词：Acetylene&ndash ; water complex ; Infrared ; Dimer ; Jet spectroscopy ; High resolution ; Van der Waals
• 刊名：Journal of Molecular Spectroscopy
• 出版年：2012
• 期刊代码：129_00222852
• 类别：ch
• 出版时间：February, 2012
• 卷：272
• 期：1
• 页码：19-22
• 文件大小：373 K

摘要

Infrared spectra of C₂D₂-water complexes are studied in the 4.1 渭m region of the C₂D₂ 谓₃ fundamental band using a tunable diode laser source to probe a pulsed supersonic slit jet. Relatively large vibrational red shifts (鈭?7.7 to 鈭?8.0 cm^鈭?) are observed which are more easily interpretable than for the analogous C₂H₂ vibration thanks to the absence of Fermi resonance effects for C₂D₂. Noticeable homogeneous line broadening leads to estimates of upper state predissociation lifetimes of about 0.5, 0.9 and 1.1 ns for C₂D₂-H₂O, -HDO, and -D₂O, respectively. Transitions involving K_a = 0 and 1 levels are observed for C₂D₂-HDO, but there is a puzzling absence of K_a = 1 for C₂D₂-H₂O and C₂D₂-D₂O.