Konstanz 1998 – wissenschaftliches Programm

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MO: Molekülphysik

MO 7: Poster: Cluster, Stoßprozesse

MO 7.23: Poster

Dienstag, 17. März 1998, 16:00–18:00, PF

Non-reactive scattering of oriented NO — •S. Stolte, M.J.L. de Lange, M.M.J.E. Drabbels, and J. Bulthuis — Dept. of Chemistry, Laser Centre,De Boelelaan 1083, 1081 HV Amsterdam

In an exploratory study it was found that orienting the NO molecules has a pronounced effect on the outcome of rotationally inelastic scattering of NO and Ar. Combined with state-resolved quantum scattering calculations, this provides insight into the nature of the orientational characteristics of the NO-Ar interaction potential. Till now, the effect of partially orienting NO has only been measured for three final rotational states, viz. J=5/2, 7/2 21/2. The steric effect depends on the parity of the final state; a result that is corroborated by scattering calculations. There are still discrepancies between experiments and calculations. This can at least partly be attributed to the experimental uncertainty, which is fairly large. Recently several measures have been taken to improve the experimental accuracy and reproducibility (e.g. by applying light-baffles to reduce the scattered light). This is necessary to become into a situation suited to measure a large number of final rotational states and other scaterring partners. This will then allow a careful assessment of the role of orientation and of parity on the outcome of the inelastic collision of an open-shell diatomic molecule with a rare gas atom. Another point of consideration is the experimental determination and control of the achieved degree of orientation of the state selected NO molecules. The degree mixing of the selected L-doubletcomponent with the other L-doublet ...