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Elastic and rotational excitation of the hydrogen molecule by 1--200-eV positron impact

Journal Article · · Phys. Rev. A; (United States)
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Pure elastic scattering (J = 0..-->..J' = 0 and J = 1..-->..J' = 1), rotational excitation (J = 0..-->..J' = 2 and J = 1..-->..J' = 3), and average elastic (pure elastic plus rotational excitation) cross sections of the hydrogen molecule by 1--200-eV positrons are computed by using the adiabatic approximation in which the Glauber-type eikonal amplitude for a fixed molecular orientation is considered as input. Both differential and total scattering cross sections are calculated. Momentum-transfer cross sections are also obtained. Two different model effective potentials for positron--hydrogen-molecule interactions have been considered. Effects of positronium formation channel are neglected. Comparison is made with the recent measurements as well as with the available theoretical calculations. Below the positronium formation threshold average total elastic-scattering cross sections are found to reproduce the experimental data quite accurately. Electron and positron scattering cross sections at intermediate energies are compared. The effects of polarization interaction are found to be significant even at 200 eV.

Research Organization:
Department of Physics, Calcutta University, 92 Acharya Prafulla Chandra Road, Calcutta 700009, West Bengal, India
OSTI ID:
6827683
Journal Information:
Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 29:3; ISSN PLRAA
Country of Publication:
United States
Language:
English

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Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ADIABATIC APPROXIMATION
COHERENT SCATTERING
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DIFFRACTION
ELASTIC SCATTERING
ELECTRON DIFFRACTION
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EV RANGE
EXCITATION
EXCITED STATES
FOUR MOMENTUM TRANSFER
HYDROGEN
MOLECULE COLLISIONS
MOMENTUM TRANSFER
NONMETALS
POSITRON COLLISIONS
POSITRON-MOLECULE COLLISIONS
POSITRONIUM
ROTATIONAL STATES
SCATTERING
TOTAL CROSS SECTIONS