The quantitative infrared and NIR spectrum of CH<sub>2</sub>I<sub>2</sub> vapor: vibrational assignments and potential for atmospheric monitoring - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Atmospheric Chemistry and Physics Discussions Année : 2006

The quantitative infrared and NIR spectrum of CH2I2 vapor: vibrational assignments and potential for atmospheric monitoring

Résumé

Diiodomethane (CH2I2) photolysis in the presence of ozone is a suggested precursor to new particle aerosol formation, particularly in coastal areas. As part of the PNNL database of gas-phase infrared spectra, the quantitative absorption spectrum of CH2I2 has been acquired at 0.1 cm?1 resolution. Two strong b2 symmetry A-type bands at 584 and 1114 cm?1 are observed, but are not resolved at 760 Torr and appear as B-type. In contrast, the b1 symmetry C-type bands near 5953, 4426 and 3073 cm?1 are resolved with rotational structure, including Q-branches with widths ?1 cm?1. The quantitative infrared and near-infrared vapor-phase spectra (600?10 000 cm?1) are reported for the first time and discussed in terms of atmospheric monitoring. FT-Raman spectra and ab initio calculations are used to complete vibrational assignments in the C2v point group.
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Dates et versions

hal-00300991 , version 1 (18-06-2008)

Identifiants

  • HAL Id : hal-00300991 , version 1

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T. J. Johnson, T. Masiello, S. W. Sharpe. The quantitative infrared and NIR spectrum of CH2I2 vapor: vibrational assignments and potential for atmospheric monitoring. Atmospheric Chemistry and Physics Discussions, 2006, 6 (1), pp.1275-1299. ⟨hal-00300991⟩

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