Photoionization of atoms. Progress report, 1 April 1978--30 March 1979. [Summaries of research activities at the Univ. Nebraska]

Technical Report · Fri Dec 01 04:00:00 EST 1978

DOI:https://doi.org/10.2172/6462615· OSTI ID:6462615

Starace, A. F.

The sources of error encountered in absorption cross section measurements were studied and efforts made to minimize the errors. Preliminary cross section measurements of Ar indicate that the double ion chamber is performing satisfactorily. Measurements of the dissociative ionization cross section of O/sub 2/ were completed in preparation for measuring the atomic cross section. The new time-of-flight mass spectrometer was constructed and tested. A theoretical survey of the photoelectron angular distribution of the outer p-subshells of the chalcogens and halogens has been completed. A new graphical method for the calculation of atomic transition matrices was developed to aid in obtaining a new open-shell random phase approximation. Graphical methods for obtaining matrix elements of spin-orbit interactions were developd and used to investigate the effect of spin-orbit interactions on photoionization of the 6s-electron in cesium and the 5s-subshell in xenon. The adiabatic approach in oblate spheroidal coordinates to the problem of a hydrogenic atom in a uniform magnetic field has been used to predict rigorous lower and upper bounds on the lowest energy levels of hydrogen. Nonadiabatic interactions are being included in the extension of the theory to the high Rydberg level region which is under intensive experimental investigation at present. Finally, the ''fine-structure'' levels superimposed on the main quasi-Landau levels in the ionization region of a hydrogen atom in a uniform magnetic field. A list of publications is included.

• Research Organization: Nebraska Univ., Lincoln (USA)
• Sponsoring Organization: USDOE
• OSTI ID: 6462615
• Report Number(s): COO-2892-13
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ALKALI METALS
ANGULAR DISTRIBUTION
ATOMS
CESIUM
CORRECTIONS
COUPLING
CROSS SECTIONS
CRYOGENIC FLUIDS
DATA
DATA COVARIANCES
DATA FORMS
DISTRIBUTION
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
FINE STRUCTURE
FLUIDS
GRAPHS
HYDROGEN
INFORMATION
INTERMEDIATE COUPLING
IONIZATION
L-S COUPLING
MAGNETIC FIELDS
MATRIX ELEMENTS
METALS
NONMETALS
NUMERICAL DATA
PHOTOIONIZATION
RANDOM PHASE APPROXIMATION
RARE GASES
RESEARCH PROGRAMS
RYDBERG CORRECTION
THEORETICAL DATA
XENON