Triply Differential Studies of Atomic and Molecular Photoionization Using Synchrotron Radiation.
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NATIONAL BUREAU OF STANDARDS WASHINGTON DC NATIONAL MEASUREMENT LAB
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Basic studies of the dynamics and spectroscopy of atomic and molecular photoionization have been carried out using three experimental probes. The first and most extensively used experimental approach involves triply differential differential in incident wavelength, electron energy, and ejection angle photoelectron measurements using synchrotron radiation. Measurements were conducted in the vacuum ultraviolet wavelength range up to h approx 35 eV on a large variety of atomic and molecular systems. Photoelectron branching ratios and angular distributions were obtained for all accessible states. A major emphasis of this work involved the initial exploration of novel effects of autionization and shape resonances on alternative vibrational ionization channels. The second experimental approach entails measuring the polarization of fluorescence folowing production of excited molecular ions by photionization. This experiment allowed the direct measurement of the alignment of molecular ions produced by photoionization and, simultaneously, the branching ratios for degenerate photoelectron channels. New spectroscopic information can also be obtained in this way. The third experimental approach involves measuring photoelectrons in coincidence with photoions.
- Atomic and Molecular Physics and Spectroscopy