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High-Resolution Infrared Spectrum of the Ring-Puckering Band, ν10, of Diborane

✍ Scribed by W.J. Lafferty; J.-M. Flaud; R.L. Sams; T.A. Blake; S.W. Sharpe

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
130 KB
Volume
201
Category
Article
ISSN
0022-2852

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✦ Synopsis

The spectrum of the 10 band of diborane, arising from the ring-puckering vibration, has been obtained with a spectral resolution of 0.0015 cm Ϫ1 in the region 275-400 cm Ϫ1 . The spectrum of a sample enriched in 10 B was recorded as well as one with naturally abundant boron, i.e., 64% 11 B 2 H 6 , 32% 10 B 11 BH 6 , and 4% 10 B 2 H 6 . This mode is the lowest vibrational level of the molecule and is unperturbed, allowing a complete assignment of not only the fundamental bands but also the 2 10 -10 hot bands of all three boron isotopomers. The intensities of several hundred lines of the fundamental and hot bands of all isotopomers have been measured and vibrational transition moments have been obtained. Finally, it has been shown that the harmonic approximation does not apply for 10 .

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