| ATOMIC AND MOLECULAR PHYSICS |
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Collisional Energy Transfer between Highly Vibrationally Excited CsH(X1Σ+, v=15–22) and H2 |
| ZHU Dong-Hui, ZHANG Bin, SHEN Yi-Fan**, DAI Kang
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Department of Physics, Xinjiang University, Urumqi 830046
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| Cite this article: |
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ZHU Dong-Hui, ZHANG Bin, SHEN Yi-Fan et al 2011 Chin. Phys. Lett. 28 093401 |
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Abstract The Cs atoms are prepared in the 6D state by two−photon absorption. CsH(X1 Σ+,v"=0) is generated from the Cs(6D)+H2 reaction. By overtone excitation with a pulsed dye laser, highly vibrational states v"≥15 of CsH in its ground electronic state are obtained. A diode laser is used to probe either the prepared vibrational state or the collisionally populated states. The decay signal of the time−resolved fluorescence from the A1 Σ+(v')→X1 Σ+(v") transition is monitored. Based on the Stern–Volmer equation, the total rate coefficients for v"=15–22 are yielded. The time evolution and relative intensities of three related states, v", v"−1 and v"−2, made by the initially prepared v" state of CsH are measured. Rate coefficients of single− and double-quantum relaxation are obtained. These results show that single-quantum relaxation accounts for ≥50% of the total relaxation out of states v"=17–20. Multiquantum relaxation (Δv≥2) makes major contribution (≥62%) to the vibrational relaxation at v"=21 and 22. A simple explanation is given.
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| Keywords:
34.50.Ez
34.10.+x
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Received: 13 May 2011
Published: 30 August 2011
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| PACS: |
34.50.Ez
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(Rotational and vibrational energy transfer)
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34.10.+x
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(General theories and models of atomic and molecular collisions and interactions (including statistical theories, transition state, stochastic and trajectory models, etc.))
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