Communication: Observation of homonuclear propensity in collisional relaxation of the 13C12CD2 (v2 = 1) isotopologue of acetylene by stimulated Raman spectroscopy
| Autor: | Dionisio Bermejo, Luciano Fusina, G. Di Lonardo, Raúl Z. Martínez, José Luis Doménech |
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| Přispěvatelé: | R. Z. Martínez, J. L. Doménech, D. Bermejo, G. Di Lonardo, L. Fusina |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
education.field_of_study
Chemistry high resolution Population General Physics and Astronomy Rotational–vibrational spectroscopy Homonuclear molecule symbols.namesake chemistry.chemical_compound Acetylene Excited state Raman spectroscopy symbols Isotopologue Physical and Theoretical Chemistry Atomic physics Spectroscopy education Raman scattering 13C12CD2 |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | 4 p.: gráf. We report the first experimental observation of homonuclear propensity in collisional relaxation of a polyatomic molecule. A pump-probe stimulated Raman setup is used to pump population to a single rotational level of the v2 = 1 vibrationally excited state in 13C12CD2 and then monitor the redistribution of the rotational population that has taken place after a fixed delay. The Q-branch of the 2ν2–ν2 band shows a pattern of intensity alternation between the even and the odd rotational components, with the greater intensities always corresponding to the rotational levels with the same parity as the one where all the population was initially deposited. The effect can be explained by the existence of a propensity rule that favors collisional relaxation between rovibrational levels of the same parity. © 2011 American Institute of Physics. Funding received from the Spanish Ministry of Science and Innovation through research Grant No. FIS2009-08069; support from CONSOLIDER-INGENIO 2010 Program CSD2009-00038 |
| Databáze: | OpenAIRE |
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