scholarly journals Photoionization Processes of the Single-Ionized Boron

2011 ◽  
Vol 2011 ◽  
pp. 1-9
Author(s):  
Ju-Tang Hsiao ◽  
Hsiao-Ling Sun ◽  
Sheng-Fang Lin ◽  
Keh-Ning Huang
Keyword(s):  
Angular Distribution ◽  
Spin Polarization ◽  
Cross Section ◽  
Approximation Theory ◽  
Random Phase Approximation ◽  
Close Agreement ◽  
Random Phase ◽  
Distribution Parameter ◽  
Phase Approximation ◽  
Rydberg Series

The relativistic calculations of the cross-section σ, the angular-distribution parameter β, and spin-polarization parameters {ξ,η,ζ} of photoelectrons using the multiconfiguration relativistic random-phase approximation theory for the photoionization of the B+ ion are presented. Precise energies and widths of all five Rydberg series of doublyexcited states (2pns)1P1o, (2pns)3P1o, (2pnd)1P1o, (2pnd)3P1o, and (2pnd)3D1o are determined. Our predictions are in very close agreement with experiments and are consistent with other calculations.

Interpretation of Preferential Adsorption Using Random Phase Approximation Theory

1995 ◽  
Vol 60 (10) ◽  
pp. 1641-1652 ◽  
Author(s):  
Henri C. Benoît ◽  
Claude Strazielle
Keyword(s):  
Approximation Theory ◽  
Random Phase Approximation ◽  
Virial Coefficient ◽  
Random Phase ◽  
Second Virial Coefficient ◽  
Solvent Mixture ◽  
Gyration Radius ◽  
Thermodynamic Quantities ◽  
Phase Approximation ◽  
Preferential Adsorption

It has been shown that in light scattering experiments with polymers replacement of a solvent by a solvent mixture causes problems due to preferential adsorption of one of the solvents. The present paper extends this theory to be applicable to any angle of observation and any concentration by using the random phase approximation theory proposed by de Gennes. The corresponding formulas provide expressions for molecular weight, gyration radius, and the second virial coefficient, which enables measurements of these quantities provided enough information on molecular and thermodynamic quantities is available.

Relativistic-random-phase approximation calculations of atomic photoionization: what we have learned

2009 ◽  
Vol 87 (1) ◽  
pp. 5-8 ◽  
Author(s):  
S T Manson
Keyword(s):  
Angular Distribution ◽  
Cross Sections ◽  
Random Phase Approximation ◽  
Random Phase ◽  
Branching Ratios ◽  
Phase Approximation ◽  
The Past ◽  
Photoionization Process ◽  
Photoelectron Angular Distribution ◽  
Made In

The relativistic-random-phase approximation (RRPA) methodology, developed by Walter Johnson and his collaborators, has been used extensively over the past three decades to calculate various aspects of the atomic photoionization process, cross sections, and branching ratios along with dipole and nondipole contributions to the photoelectron angular distribution. In this paper, some of the progress made in our understanding of the photoionization process as a result of RRPA calculations is reviewed.PACS No.: 32.80.Fb

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