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| Titel |
The quantitative infrared and NIR spectrum of CH2I2 vapor: vibrational assignments and potential for atmospheric monitoring |
| VerfasserIn |
T. J. Johnson, T. Masiello, S. W. Sharpe |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 9 ; Nr. 6, no. 9 (2006-07-04), S.2581-2591 |
| Datensatznummer |
250003980
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| Publikation (Nr.) |
 copernicus.org/acp-6-2581-2006.pdf |
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| Zusammenfassung |
| Diiodomethane (CH2I2) has recently become a molecule of
significant atmospheric interest as it can contribute to coastal IO
formation. 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 when broadened to 760 Torr
with nitrogen 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. Some bands are discussed in
terms of their potential for atmospheric monitoring and theoretical
detection limits on a selected basis. FT-Raman spectra and ab initio calculations are
used to complete vibrational assignments in the C2v point group. |
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