Diabatic-states representation for He* (n > or = 3) + He collisions

Journal Article · Thu Jan 01 04:00:00 EST 1976 · Phys. Rev., A, v. 13, no. 1, pp. 86-98

OSTI ID:4071346

Cohen, J S

A diabatic-states representation for scattering of triplet helium atoms, with n > or = 3, by the ground-state helium atom is presented. Ab initio calculations have been performed on the $sup 3$$Sigma$$sup +$/subg/,/subu/, $sup 3$Pi/subg/,/subu/, and $sup 3$$delta$/subg/ Rydberg states of He$sub 2$. Matrix elements for radial and angular coupling between the orthogonalized diabatic states have also been evaluated. The angular couplings are quite weak, with the result that molecular states with different electronic symmetries are effectively uncoupled in low-energy collisions. The crossing by a repulsive diabatic- potential curve through the Rydberg series and into the continuum is shown to be an effective mechanism for associative ionization. Some qualitative observations on associative ionization and dissociative recombination are made. (AIP)

• Research Organization: Theoretical Division (T-6), Los Alamos Scientific Laboratory, University of California, Los Alamos, New Mexico 87544
• NSA Number: NSA-33-021191
• OSTI ID: 4071346
• Journal Information: Phys. Rev., A, v. 13, no. 1, pp. 86-98, Journal Name: Phys. Rev., A, v. 13, no. 1, pp. 86-98; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

*HELIUM-- DIABATIC APPROXIMATION
640304* --Physics Research--Atomic
Molecular & Chemical Physics--Collision Phenomena
ATOMIC MODELS
IONIZATION
METASTABLE STATES
N60400* --Physics (Atomic & Molecular)--Collision Phenomena
SCATTERING