High-Resolution Spectroscopy and Dynamics of Multiphoton Processes in Atoms and Molecules.
Annual Summary rept. 1 Oct 83-30 Sep 84,
ARGONNE NATIONAL LAB IL
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This report summarizes research on resonantly enhanced multiphoton absorption, dissociation, and ionization processes in atoms and molecules. Multiphoton processes are studied using from one to three independently tunable visible andor UV laser beams in order to establish both the underlying physics and the high degree of selectivity of multiphoton processes. Measurements are made to probe both the formation of excited molecular states and the subsequent behavior of excited states either in the presence or in the absence of further intense laser radiation. Detection methods include laser-induced fluorescence, ion mass analysis, and electron kinetic energy analysis. During the current reporting period, we have studied resonant multiphoton ionization processes in H2 and N2, and have demonstrated that, in certain cases, it is possible to produce rotationally, vibrationally, and electronically state selected ions with greater than 95 purity.
- Atomic and Molecular Physics and Spectroscopy
- Nuclear Physics and Elementary Particle Physics