The effect of several configuration interaction target states on the elastic scattering of low-energy electrons by complex atoms. Physical sciences research papers

Technical Report · Tue Jan 28 00:00:00 EST 1975

OSTI ID:7187322

Smith, E R

The total wave function (target plus incident electron) is represented by a close coupling expansion. For complex atoms such as atomic helium and oxygen, the effects of configuration interaction target states are discussed and analyzed, in part. For atomic helium, the doublet S partial-wave elastic cross section obtained using a He configuration interaction ground state is virtually identical with the corresponding cross section obtained using a Roothaan--Hartree--Fock ground state. In all cases studied, the elastic phase shift is shown to increase with the addition of atomic states and explicit correlation states into the expansion for the total wave function. For atomic oxygen, the quartet P partial-wave elastic phase shift can increase to such an extent as to introduce a 'resonance' behavior into the low-energy part of the elastic cross section. Finally, a second procedure is discussed for including correlation states when CI target states are used in the close-coupling expansion. (GRA)

• Research Organization: Air Force Cambridge Research Labs., L.G. Hanscom Field, MA (USA)
• OSTI ID: 7187322
• Report Number(s): AD-A-010421; AFCRL-TR-75-0054; AFCRL-PSRP-625
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ELECTRON-ATOM COLLISIONS
ELASTIC SCATTERING
HELIUM
OXYGEN
CONFIGURATION INTERACTION
CORRELATIONS
GROUND STATES
HARTREE-FOCK METHOD
PHASE SHIFT
WAVE FUNCTIONS
ATOM COLLISIONS
COLLISIONS
CRYOGENIC FLUIDS
ELECTRON COLLISIONS
ELEMENTS
ENERGY LEVELS
FLUIDS
FUNCTIONS
NONMETALS
RARE GASES
SCATTERING
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena