High-Resolution Spectroscopy and Dynamics of Multiphoton Processes in Atoms and Molecules.
Abstract
This report summarizes research to establish the high-resolution spectroscopy and detailed mechanisms of sequences of resonant transitions induced in atoms and molecules by multicolor, multiphoton excitation. These processes are studied as a function of the independently tunable frequencies and polarization states of multiple dye laser beams in order to establish both the underlying physics and the high degree of selectivity of this advanced form of laser excitation. Detection methods include photoelectron analysis, mass spectrometry, and laser-induced fluorescence. During this period, all instrumentation needed for this research was put into full operation and was used to examine multiphoton ionization processes in H2, CO, and N2. For example, a novel, totally-state-selected process was studied in H2 in which a single rotational, vibrational level of the target gas was excited by three-photon excitation to a single rotational, vibrational level of the B 1 epsilon u state of H2, followed by single-photon ionization. The ejected electrons were then energy analyzed with rotational resolution. The ejected electrons were then energy analyzed with rotational resolution, yielding the first rotationally resolved study of photoionization of an excited molecular state. Multicolor studies are now beginning, and an improved electron spectrometer system is being developed to greatly enhance the resolution/sensitivity of these studies.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 15, 1983
- Accession Number
- ADA129120
Entities
People
- Joseph L. Dehmer
- Patricia M. Dehmer
Organizations
- Argonne National Laboratory