# DETECTION OF THE $\nu_{2}$ BANDS OF $CD_{2}$ AND $CH_{2}$ BY INFRARED DIODE LASER SPECTROSCOPY

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 Title: DETECTION OF THE $\nu_{2}$ BANDS OF $CD_{2}$ AND $CH_{2}$ BY INFRARED DIODE LASER SPECTROSCOPY Creators: McKellar, A. R. W.; Yamada, Chikashi; Hirota, Eizi Issue Date: 1983 Publisher: Ohio State University Abstract: Using a tunable diode laser spectrometer with a Zeeman-modulated multiple-reflection cell, we have observed five transitions of $CD_{2}$ around $710 cm^{-1}$ and two of $CH_{2}$ around $892 cm^{-1}$. One of the $CH_{2}$ transitions ($4_{13} \leftarrow 4_{22}$) represents a new measurement, and the other ($4_{04}\leftarrow 4_{13}$) had been observed previously by laser magnetic $resonance.^{1}$ The $CD_{2}$ transitions were of the form $N_{O,N} \leftarrow N_{1,N-1}$ with N = 3 to 7. They represent the first observation of $\nu_{2}$ in $CD_{2}$, and the lines were found just $1.5 cm^{-1}$ higher than predicated by a nonrigid bender $analysis^{2}$ of $CH_{2}$ data. The present results yield the $\nu_{2}$ band origin for $CD_{2}$ ($752.375 cm^{-1}$) as well as $1/2(B + c)$, $\Delta_{N^{\prime}}$, and D (the diagonal spin-spin interaction parameter) for the $v_{2} = 1$ state. $^{1}$T.J. Sears, P.R. Bunker, and A.R.W. McKellar, J. Chem. Phys. 77, 5363 (1982). $^{2}$P. Jensen, P.R. Bunker, and A.R. Hoy, J. Chem. Phys. 77, 5370 (1982). Description: Author Institution: Herzberg Institute of Astrophysics, National Research Council of Canada; Herzberg Institute of Astrophysics, Institute for Molecular Science URI: http://hdl.handle.net/1811/11948 Other Identifiers: 1983-TA-09