# VELOCITY MODULATION LASER SPECTROSCOPY OF NEGATIVE IONS: THE $\nu_{3}$ BAND OF AZIDE ($N_{3}^{-}$)

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 Title: VELOCITY MODULATION LASER SPECTROSCOPY OF NEGATIVE IONS: THE $\nu_{3}$ BAND OF AZIDE ($N_{3}^{-}$) Creators: Polak, M.; Gruebele, M.; Saykally, R. J. Issue Date: 1987 Publisher: Ohio State University Abstract: Thirty-four transitions in the $\nu_{3}$ (asymmetric stretch) fundamental of the azide anion have been measured in an $NH_{3}/N_{2}O$ discharge using diode laser velocity modulation spectroscopy. The data, ranging from P(42) to R(62), were fit to a linear molecule effective Hamiltonian quartic terms. The vibrational band origin was determined to be $\nu_{3} = 1986.4672(19) cm^{-1}$ and the rotational constants are $B^{\prime\prime} = .426203(57) cm^{-1}$ and $B^{\prime\prime} = .422572(55) cm^{-1}$. Comparisons with ab initio calculations and condensed phase measurements are presented. The observed 2:1 intensity alternation in successive rotational lines establishes the centrosymmetric structure of the anion ($r_{0} = 1.188402(82)A)$. Description: Author Institution: Department of Chemistry, University of California URI: http://hdl.handle.net/1811/17183 Other Identifiers: 1987-ME-10