High-resolution infrared spectroscopy of CH2D79Br: ro-vibrational analysis of the ν4 and ν8 fundamental bands
| Autor: | Paolo Stoppa, Agostino Baldacci, Raffaella Visinoni, R. Wugt Larsen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Infrared
Mono-deuterated methyl bromide Analytical chemistry Biophysics High resolution Infrared spectroscopy 010402 general chemistry 01 natural sciences Hot band symbols.namesake 0103 physical sciences spectroscopic parameters Physical and Theoretical Chemistry Tetrad Molecular Biology Settore CHIM/02 - Chimica Fisica Range (particle radiation) 010304 chemical physics Chemistry Anharmonicity Condensed Matter Physics Coriolis interactions infrared spectrum 0104 chemical sciences Fourier transform symbols Atomic physics |
| Popis: | The high-resolution Fourier transform infrared spectrum of CH2D79Br has been recorded and analysed in the region of the ν4 and ν8 fundamentals located in the range 1125−1360 cm−1. The strong ν4 band, centred at 1225 cm−1, shows an a/b-hybrid structure with predominant a-type character, whereas ν8, at 1253 cm−1, generates a c-type contour comparable in intensity to the b-type component of ν4. The upper states of these fundamentals are coupled through a- and b-type Coriolis resonances; further complications in this band system arise from perturbations due to the ν6 = 2 (1183 cm−1) and ν5 = ν6 = 1 (1359 cm−1) dark states. The former interacts with ν8 = 1 by b-type Coriolis coupling, whereas the latter perturbs the ν4 = 1 and ν8 = 1 levels by anharmonic and a-type Coriolis resonances, respectively. Accurate upper state parameters and interaction terms have been determined for the tetrad system ν4/ν8/2ν6/ν5+ν6 by also including in the dataset the assigned transitions of the 2ν6−ν6 and ν5+ν6−ν6 hot bands obtained from previous analysis. |
| Databáze: | OpenAIRE |
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