ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The high resolution infrared spectrum of jet-cooled 1-butyne is reported for the acetylenic C–H stretch. The absorbance of an F-center laser beam is enhanced by a multiple reflection cell surrounding the free jet. Although the spectrum in the gas phase (300 K) is a featureless rotational contour, at 3 K sharp features are observed. For J'=0, 1, 2, the K'a =1 lines are spectroscopically well-behaved, but the Ka =0 lines are split into multiplets. Analysis of the K'a =1 lines gives the constants (B'+C')/2=0.143 82(11) cm−1, (B'−C')/2=0.007 20(11) cm−1, and ν0+A'−A‘=3333.0182(9) cm−1. The quantities in parentheses are two standard deviations in units of the last digit. It is concluded that the Ka =0 levels are mixed with the bath of background vibrations by anharmonic matrix elements the order of 0.01 cm−1.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.453769
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