Infrared combination and difference bands of the NO dimer
| Autor: | James K.G. Watson, Jenna M. King, Ke-Xian Au Yong, A. R. W. McKellar |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Materials science
Infrared health care facilities manpower and services Dimer education Nitric oxide Combination bands humanities Atomic and Molecular Physics and Optics chemistry.chemical_compound chemistry health services administration Force field Physical and Theoretical Chemistry Atomic physics health care economics and organizations Spectroscopy |
| Zdroj: | Journal of Molecular Spectroscopy. 238:127-134 |
| ISSN: | 0022-2852 |
| DOI: | 10.1016/j.jms.2006.04.018 |
| Popis: | The mid-infrared (1500–3800 cm⁻¹) absorption spectrum of gaseous nitric oxide has been studied at low temperature (99 K) with a long absorption path (160 m) in order to observe weak combination, difference, and overtone bands of the NO dimer. About ten new bands were assigned with greater or lesser certainty. Combined with previous results, they lead to a set of 12 secure and 7 tentative vibrational term values for (NO)2, essentially doubling our knowledge of NO dimer vibrational states. The strongest non-fundamental bands in this region, other than the ν1 (symmetric N–O stretch) + ν5 (asymmetric N–O stretch) overtone, involve combinations of ν5 with ν3 (intermolecular stretch). Excitation of ν5 results in increased frequencies for the intermolecular modes ν2, ν3, and ν4. A new value of 155.5 cm⁻¹ was obtained for ν4, the elusive infrared-inactive out-of-plane fundamental vibration. |
| Databáze: | OpenAIRE |
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