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.
Domaines
Océan, Atmosphère
Origine : Accord explicite pour ce dépôt
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