# INFRARED SPECTROSCOPY IN AN $N_{2}$/$H_{2}$/He DISCHARGE : 1) HOT BANDS OF $HN_{2}^{+}$ IN HIGHLY EXCITED STATES.

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 Title: INFRARED SPECTROSCOPY IN AN $N_{2}$/$H_{2}$/He DISCHARGE : 1) HOT BANDS OF $HN_{2}^{+}$ IN HIGHLY EXCITED STATES. Creators: Kabbadj, Y.; Huet, T. R. Issue Date: 1992 Publisher: Ohio State University Abstract: A new spectrum in the infrared region, between 3500 and $2900 cm^{-1}$, was recorded using a difference frequency laser spectrometer with the velocity modulation technique for detection. Several ions, mainly nitrogen containing ones, were produced in a mixture of $\sim$0.04 Torr of $N_{2}$, -0.04 Torr of $H_{2}$ and $\sim$7 Torr of He in an AC glow discharge. In this communication we report the observation of a total of 22 new hot bands of $HN_{2}^{+}$. The position of the lower level of the hot band $v_{1}^{+}v_{3}\leftarrow 3v_{3}$ ($\sim7000 cm^{-1}$) above the ground vibrational state indicates the high vibrational temperature of the ions in the discharge. The results of our analysis and those concerning the three fundamental vibration $bands ^{1-4}$ as well as the hot band $4v_{1}+v_{2}\leftarrow v_{2}$ are fitted together to a global Hamiltonian model. This model takes explicitely into account the degeneracy of $v_{2}$ and the rotational 1-type doubling. The most complete set of molecular constants of $HN_{2}^{+}$ will be presented. Results of the quantitative determination of the vibrational and rotational temperatures will also be reported. Description: $^{1}$ C.S. Gudeman, M.H. Begeman, J. Pfaff and R.J. Saykally, J. Chem. Phys. 78 . 5837 (1983). $^{2}$ S.C. Foster and A.R.W. McKellar, J. Chem. Phys. 81 , 3424 (1984). $^{3}$ T.J. Sears. J. Opt. Soc. Am. B 2 , 786 (1985). $^{4}$ J.C. Owrutsky, C.S. Gudeman, C.C. Martner, L.M. Tack, N.H. Rosenbaum and R.J. Saykally, J. Chem. Phys. 84 605 (1986). Author Institution: Department of Chemistry and Department of Astronomy and Astrophysics, The University of Chicago URI: http://hdl.handle.net/1811/12698 Other Identifiers: 1992-MF-10