e(-CO and e(-CO/sub 2/ total cross-section measurements

Journal Article · Tue Mar 01 04:00:00 EST 1983 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.27.1328· OSTI ID:6266525

Kwan, C K; Hsieh, Y; Kauppila, W E; Smith, S J; Stein, T S; Uddin, M N; Dababneh, M S

As part of a continuing series of investigations, total scattering cross sections have been measured in the same apparatus for positrons and electrons colliding with CO and CO/sub 2/ p using a beam-transmission technique. The projectile impact energies are in the range 1--500 eV for e/sup + -/-CO, 30--500 eV for e/sup +/-CO/sub 2/, and 100--500 eV for e/sup -/-CO/sub 2/. An important aspect of our work is to compare the corresponding positron and electron total cross section (Q/sub T/) curves for a given target gas. For both CO and CO/sub 2/ the electron Q/sub T/ values are generally larger than the positron results. For both gases at low energies there are relatively narrow shape resonances for electron scattering and noticeable increases in Q/sub T/ after the positronium-formation thresholds for positron scattering. At the highest energies investigated there are indications of a tendency toward merging of the positron and electron curves for each gas. A striking similarity is found between the present e/sup + -/-CO Q/sub T/ curves and the e/sup + -/-N/sub 2/ Q/sub T/ curves obtained by Hoffman et al. (Phys. Rev. A 25, 1393 (1982)), in that the corresponding shapes and magnitudes are very nearly the same. Estimates of potential experimental errors, as well as the experimental discrimination against projectiles scattered at small forward angles, are made.

• Research Organization: Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48202
• OSTI ID: 6266525
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 27:3; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COLLISIONS
CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ENERGY
ENERGY RANGE
EV RANGE
ION SPECTROSCOPY
MOLECULE COLLISIONS
OXIDES
OXYGEN COMPOUNDS
POSITRON COLLISIONS
POSITRON-MOLECULE COLLISIONS
POSITRONIUM
SPECTROSCOPY
THRESHOLD ENERGY
TOTAL CROSS SECTIONS