ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
We have applied the laser-pump/probe and double-beam absorption/dispersion approaches to the far wings of the Hg 3P1–1S0 resonance line broadened by collisions with H2, D2, and HD. Absolute reduced absorption coefficients of the Hg–D2 quasimolecules have been determined as a function of the wave-number shift Δ from the resonance-line center both in the red and blue wings. The nascent rotational distributions have been determined for the v=0 and 1 levels of HgH (X 2Σ+) and the v=0 level of HgD (X 2Σ+) formed from the Hg*(3P1)–H2, D2, and HD collisional–quasimolecular states A˜ and B˜ attained by the red- and blue-wing excitation, respectively. Both of the intermediate states A˜ and B˜ give quite similar rotational distributions peaking around N(approximately-equal-to)18 for HgH and N(approximately-equal-to)25 for HgD insensitive to the excitation-wave-number shift Δ. However, a small difference is found: the red-wing excitation gives larger populations in the low-N levels than the blue-wing one. The departing atom isotope effect is observed in these low-N populations of HgD from Hg–D2 and Hg–HD. The absolute ratio of the nascent yields of v=1 to 0 has been measured to be 0.3, being nearly constant against Δ in both the red and blue wings. These observations indicate that HgH is formed predominantly from a bent H–Hg–H configuration on both the pathways via the A˜ and B˜ states. The different type of transition state, however, may be encountered on the pathways producing the minor components in the low-N levels. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.472602
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