Crossed-beam measurements of differential cross sections for elastic scattering and charge exchange in low-energy He/sup +/-He collisions
Differential cross sections for the He/sup +/-He collisions have been measured at eleven laboratory energies in the range 0.4--30 eV and laboratory scattering angles from 2 to 90 deg using a crossed-beam apparatus. Data are presented as absolute differential cross sections in the center-of-mass coordinate system as functions of relative translational energy and center-of-mass scattering angle. The experimental data required to establish the instrumental characteristics accurately at each energy are presented. These data will allow theoretical differential cross sections to be convoluted with the distributions characteristic of our experiments and should allow a rather precise determination of the long-range portion of the He/sup +/-He interaction potentials. Preliminary interpretation of the rainbow scattering data gives a dissociation energy D/sub e/ for the X /sup 2/..sigma../sup +//sub u/ state of He/sub 2//sup ts+/ of 2.58 +- 0.05 eV. This value is in good agreement with an earlier experimental result and with the most recent ab initio calculations. At relative collision energies above 1 eV, total charge-exchange cross sections obtained by integrating differential cross sections over the appropriate angular range are in reasonable agreement with previous experimental and theoretical work.
- Research Organization:
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112
- OSTI ID:
- 6929728
- Journal Information:
- Phys. Rev., A; (United States), Vol. 17:4
- Country of Publication:
- United States
- Language:
- English
Similar Records
Crossed-beam measurements of differential cross sections for elastic scattering and charge exchange in low-energy Ar/sup +/-Ar collisions
Potential energies for Ca/sub 2//sup ts+/: Cross sections for collisions of Ca/sup +/ and Rydberg Ca/sup asteriskasterisk/ with Ca
Related Subjects
HELIUM
ION-ATOM COLLISIONS
HELIUM IONS
ATOMIC BEAMS
ATOMIC IONS
CHARGE EXCHANGE
COLLIDING BEAMS
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ION BEAMS
ATOM COLLISIONS
BEAMS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
ION COLLISIONS
IONS
NONMETALS
RARE GASES
SCATTERING
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena