# HIGH RESOLUTION INFRARED SPECTRUM OF THE RING-PUCKERING BAND, $\nu_{10}$, OF DIBORANE

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 Title: HIGH RESOLUTION INFRARED SPECTRUM OF THE RING-PUCKERING BAND, $\nu_{10}$, OF DIBORANE Creators: Lafferty, W. J.; Flaud, J.- M.; Sams, Robert L.; Blake, Thomas A.; Sharpe, Steven W. Issue Date: 1999 Publisher: Ohio State University Abstract: We are in the process of studying all the infrared active fundamentals of diborane; the spectrum from $280 cm^{-1}$ to $2700 cm^{-1}$ has been recorded, and band-by-band analysis is in progress. The analysis of the lowest frequency band centered near $369 cm^{-1}, \nu_{10}$, which results from the ring puckering vibration, will be presented in this talk. The spectrum of a sample with boron in natural abundance ($19\% {^{10}}B, 81\% {^{11}}B$) as well as one enriched in $^{10}B$ has been obtained with a resolution of $0.0015 cm^{-1}$ and a S/N of better than 500 to 1. This band appears to be the only unperturbed band in the diborane spectrum, and assignment of the three beautiful b-type bands of the $^{10}B_{2}H_{6}, {^{10}}B^{11}BH_{6}$ and $^{11}B_{2}H_{6}$ isotopomers was straightforward despite the fact that the band centers of all three isotopomers fall within $0.05 cm^{-1}$ of each other. In the enriched $^{10}B$ sample the hot band, $2\nu_{10}-\nu_{10}$, could be completely assigned and spectroscopic constants obtained for the $A_{g} 2\nu_{10}$ state. Description: Author Institution: Optical Technology Division, NIST, Gaithersburg; Laboratoire de Photophysique Mol\'{e}culaire, CNRS, Universit\'{e} de Paris Sud; Pacific Northwest National Laboratory, P.O. Box 999 URI: http://hdl.handle.net/1811/19208 Other Identifiers: 1999-FB-05