Accession Number:

ADA142834

Title:

Triply Differential Studies of Atomic and Molecular Photoionization Using Synchrotron Radiation.

Descriptive Note:

Annual summary rept. 1 Oct 83-30 Sep 84,

Corporate Author:

NATIONAL BUREAU OF STANDARDS WASHINGTON DC NATIONAL MEASUREMENT LAB

Personal Author(s):

• Parr,A. C.
• Dehmer,J. L.

Report Date:

1984-07-03

Pagination or Media Count:

16.0

Abstract:

Basic studies of photoionization processes in atoms and molecules have been carried out using triply differential differential in incident wavelength, ejected electron energy, and ejection angle photoelectron spectroscopy with synthrotron radiation as the excitation source. Measurements have been conducted in the vacuum ultraviolet wavelength range up to HNu about 35 eV on a variety of atomic and molecular systems. Photoelectron branching ratios partial photoionization cross sections and photoelectron angular distributions were obtained for all accessible states. Publications on C2N2, SO2, HCN, CH3CN, and BF3 were published or submitted for publication during the last year. The work on BF3 included extensive comparison with theoretical calculations, which revealed unexpected aspects of the dynamics of shape resonances in molecular photoionization. During the last year, the main effort has been placed on completion of a major new instrument for these studies.

Descriptors:

• *MOLECULES
• *ATOMS
• *PHOTOIONIZATION
• SOURCES
• ULTRAVIOLET RADIATION
• SPECTROSCOPY
• EXCITATION
• SHAPE
• RESONANCE
• CROSS SECTIONS
• INSTRUMENTATION
• PHOTOELECTRONS
• SYNCHROTRONS

Subject Categories:

• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE