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The ν7+ ν9− ν9Hot Band in Ethane

✍ Scribed by Jos Oomens; Jörg Reuss

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
336 KB
Volume
177
Category
Article
ISSN
0022-2852

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✦ Synopsis

Applying an IRIR double resonance technique in a seeded molecular jet, a rotationally cooled hot band spectrum of ethane has been recorded in the region of the C-H stretching fundamental n 7 near 3000 cm 01 . The observed hot bands are assigned to the two perpendicular components of the n 7 / n 9 (A 1g ᮍ A 2g ᮍ E g ) R n 9 (E u ) band. The spectrum appears to be heavily perturbed by dark state interactions in the upper state, forcing us to analyze each K-stack separately. Rotational levels in the n 7 / n 9 state up to J Å 15 and K Å 5 have been least-squares fitted to standard symmetric rotor expressions with an average standard deviation of 0.0014 cm 01 . No evidence has been found of hot bands starting from excited torsional states, indicating that these levels are quickly deactivated by V-T transfer to the ground state in the collisional environment of the jet; however, the n 9 state collects a substantial population, suggesting that this state is collisionally rather stable.

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