Rotational energy transfer in the Na2b 3Πustate: Propensity rules for transitions between hyperfine components
| Autor: | A. M. Lyyra, Qingshi Zhu, Robert W. Field, Li Li, Thou Jen Whang, William C. Stwalley, M. H. Alexander |
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| Rok vydání: | 1993 |
| Předmět: | |
| Zdroj: | The Journal of Chemical Physics. 98:8413-8418 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.464499 |
| Popis: | The changes in the hyperfine quantum number (F’) that accompany collision‐induced ΔJ, ΔΩ, and Δ(e/f‐parity) transitions in the Na2 b 3Πu‐state have been studied by sub‐Doppler, cw, perturbation‐facilitated optical–optical double resonance (PFOODR) spectroscopy. The Na2 is contained in a heat pipe oven at ∼1 Torr and the primary collision partner is Na(3s 2S). The PUMP laser selectively excites a single b 3Π0u v’=12, J’=43e, s or 44e, a rotational level, the parent level. All F’ hyperfine components of the parent J’ level are directly populated by the PUMP laser, but with different velocity projections relative to the laser propagation direction. Thus each parent hf component is labeled by its longitudinal velocity. As the PROBE laser is scanned through various 2 3ΠΩg v=2, J←b 3ΠΩ’u v’=12, J’ transitions, sub‐Doppler hyperfine structure can be resolved on each parent and daughter rotational line in the PFOODR fluorescence excitation spectrum. The collisional propensity rule ΔF=ΔJ is obeyed for (s, a permut... |
| Databáze: | OpenAIRE |
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