# MASS DEPLETION SPECTROSCOPY OF $NO_{2}$ MOLECULE

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 Title: MASS DEPLETION SPECTROSCOPY OF $NO_{2}$ MOLECULE Creators: Stolyarov, Daniil; Polyakova, Elena; Wittig, C. Issue Date: 2004 Publisher: Ohio State University Abstract: A mass spectrometric depletion measurement has been performed for the $NO_{2}$ molecule in its bound region as well as above its gas phase dissociation threshold. In the bound region ($17700 - 18300 cm^{-1}$) that is known to be vibronically chaotic transitions are broadened and blue-shifted relative to their gas-phase counterparts. The spectrum is fitted relatively well by setting all shifts and width equal to $7 cm^{-1}$. Modest dispersion of these values are consistent with quantum chaos in $NO_{2}$. Relaxation is dominated by interaction of $NO_{2}$ with its non-superfluid helium nearest $neighbors.^{a}$ In the region above the gas-phase dissociation threshold ($25125 - 30000 cm^{-1}$) the mass depletion spectrum reveals no fine structure. The fast relaxation due to the interaction with the superfluid helium environment prevents photodecomposition of the $NO_{2}$ molecule over the entire range we explored. Description: $^{a}$E. Polyakova, D.Stolyarov, X Zhang, V.V. Kresin and C. Wittig Chem. Phys. Lett. 375 (2003) pp. 253-260 Author Institution: Department of Chemistry, University of Southern California URI: http://hdl.handle.net/1811/21212 Other Identifiers: 2004-MI-02