EFFECTS OF VIRTUAL EXCITATION OF THE 2s STATE ON THE ELASTIC SCATTERING OF ELECTRONS BY ATOMIC HYDROGEN

Journal Article · Mon Jan 15 04:00:00 EST 1962 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.125.553· OSTI ID:4814543

Smith, K; McEachran, R P; Fraser, P A

The elastic scattering of electrons by hydrogen atoms, for electron energies below the first threshold of excitation of the atom (10.2 ev), is investigated numerically making full allowance for exchange and for the vdrtual excitation of the 2s state. Singlet and triplet phases for the s, p, and d partial waves were obtained. While the calculation is essentially preliminary to a more extensive eigenfunction expansion calculation for this problem, which would allow for nonspherical distortion of the atom, significant changes from the first exchange approximation may be expected as more states are included in the expansion. In particular, just below the n = 2 excitation threshold the singlet s phase and the triplet p phases begin to increase sharply, and what may be a Wigner cusp shows in the total cross section. Predicted angular distributions are compared with the recent measurements of Gilbody, Stebbings, and Fite. The phase shifts are compared with those of the exchange approximation, and also with those of Geltman, who performed a variational calculation allowing for the virtual excitation of the 2s and 3s states. (auth)

• Research Organization: Argonne National Lab., Ill.
• NSA Number: NSA-16-009321
• OSTI ID: 4814543
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 125; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
ATOMIC MODELS
ATOMS
ELASTIC SCATTERING
ELECTRON BEAMS
ELECTRONS
ENERGY
ENERGY LEVELS
ENERGY RANGE
EV RANGE
EXCITATION
HYDROGEN
PERTURBATION THEORY
PHASE SHIFT
PHYSICS
QUANTUM MECHANICS
SCATTERING
SHELLS