Absorption and emission of radiation during electron excitation of the 2 sup 1 S and 2 sup 1 P states of helium

We are reporting electron spectra resulting from the inelastic scattering of 45-eV electrons from helium atoms through a scattering angle of 12{degree} in the presence of an intense carbon dioxide laser. The spectra presented are in the region of the 2 {sup 1}S and 2 {sup 1}P states of helium. These...

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Bibliographic Details
Published in:Physical review. A, General physics General physics, 1989-11, Vol.40:9
Main Authors: Wallbank, B., Holmes, J.K., Weingartshofer, A.
Format: Article
Language:English
Subjects:
640304 - Atomic, Molecular & Chemical Physics- Collision Phenomena
ATOM COLLISIONS
ATOMIC AND MOLECULAR PHYSICS
CARBON DIOXIDE LASERS
COLLISIONS
ELECTROMAGNETIC RADIATION
ELECTRON COLLISIONS
ELECTRON SPECTRA
ELECTRON-ATOM COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
EV RANGE
EV RANGE 10-100
FLUIDS
GAS LASERS
GASES
HELIUM
INELASTIC SCATTERING
LASER RADIATION
LASERS
NONMETALS
P STATES
RADIATIONS
RARE GASES
S STATES
SCATTERING
SPECTRA
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Summary:We are reporting electron spectra resulting from the inelastic scattering of 45-eV electrons from helium atoms through a scattering angle of 12{degree} in the presence of an intense carbon dioxide laser. The spectra presented are in the region of the 2 {sup 1}S and 2 {sup 1}P states of helium. These data show additional structure when the laser is present at scattered electron energies which correspond to an increase or decrease in electron kinetic energy of the equivalent of one laser quantum. These measurements demonstrate the simultaneous electron-photon excitation of an atom at high incident-electron energies.
ISSN:0556-2791
DOI:10.1103/PhysRevA.40.5461