Electron-collision shift of the Lyman-alpha line in H and Hhe. Interim report

Technical Report · Fri Sep 09 04:00:00 EDT 1988

OSTI ID:6512882

Blaha, M; Davis, J

The interaction of plasma microfields with radiating atoms and ions causes a line broadening that governs both the half-width and shift of the spectral line, i.e., the intensity distribution in frequency is altered to reflect the presence of the plasma. The line shifts are of particular interest both for their intrinsic value in terms of providing insight into the fundamental nature of the underlying physical processes affecting the emission of radiation as well as its diagnostic value in the study of high-density plasmas. In addition, exact wavelengths of spectral lines of highly charged ions are required in the determination of line opacities and level positions for x-ray-laser transitions. The sensitivity of spectral line shift is investigated in the impact approximation for a variety of assumptions using the distorted-wave with exchange approach. The formalism is applied to the Lyman-alpha line of hydrogen and ionized helium to determine the influence of various assumptions on the line shift as well as identifying the differences between a neutral and ionized radiator. The results are compared and contrasted with a number of other calculations and experimental measurements. (AW)

• Research Organization: Naval Research Lab., Washington, DC (USA)
• OSTI ID: 6512882
• Report Number(s): AD-A-200296/2/XAB; NRL-MR-6294
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
CHARGED PARTICLES
COLLISIONS
DATA
DISTRIBUTION
DOCUMENT TYPES
ELECTRON COLLISIONS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
EMISSION
EXPERIMENTAL DATA
FERMIONS
HELIUM IONS
HYDROGEN
INFORMATION
IONIZATION
IONS
LASERS
LEPTONS
LYMAN LINES
NONMETALS
NUMERICAL DATA
PROGRESS REPORT