OBSERVATION OF THE $\nu_{1}$ AND $\nu_{3}$ FUNDAMENTAL BANDS OF $H_{2}C\ell^{+}$

$^{1}$ K. Kawaguchi and E. Hirota, J. Chem. Phys. 85, 6910 (1986).Author Institution: Herzberg Institute of Astrophysics, National Research Council of Canada; Laboratorium fur Physikalische Chemie, Eidgenossische Technische Hochschule Zurich; Laboratorium fur Physikalische Chemie, Institute for Molecular ScienceThe $\nu_{1}$ and $\nu_{3}$ bands of chloronium ion($H_{2}C\ell^{+}$) have been observed with a difference frequency laser system at NRC. The ion was generated through a hollow cathode discharge modulated at 16 kHz in a gas mixture of $HC\ell(\sim 30 mTorr)$ and $H_{2}(\sim 0.7 Torr)$. The observation was done with a dry-ice cooled multiple traversal cell connected to a fast flow pumping system. The assignment was not easily made due to the Coriolis interaction between the $\nu_{1} = 1$ and $\nu_{3} = 1$ states. The first clue of the assingment was obtained by a systematic sorting for the ground state combination differences which were known from the analysis of the $\nu_{2}$ band by Kawaguchi and $Hirota.^{1}$ A least squares fit of the observed transitions has been done by employing Watson's A-reduced Hamiltonian, and the band origins, rotational constants, and centrifugal distortion constants have been obtained