Collisional studies of the excited state potential energy surfaces of HeH/sup +//sub 2/: Energy thresholds and cross sections for reactions of helium ions with hydrogen yielding H/sup +/, H/sup +//sub 2/, H/sup +//sub 3/, HeH/sup +/, and H*(nl)

Journal Article · Mon Dec 01 04:00:00 EST 1980 · J. Chem. Phys.; (United States)

OSTI ID:6789178

Jones, E G; Wu, R L.C.; Hughes, B M; Tiernan, T O; Hopper, D G

Beam collision cell apparatuses have been employed to determine the energy dependences of the cross sections for the reactions of He/sup +/ with H/sub 2/ to yield the ionic or luminescent product species H/sup +/, H/sup +//sub 2/, H/sup +//sub 3/, HeH/sup +/, H*(2l), H*(3l), and H*(4l). Distinct thresholds were observed for the formation of H/sup +/ at 7.1 +- 0.2 eV, for HeH/sup +/ and H*(2l) at 9.0 +- 0.1 eV, for H*(3l) at 12.7 +- 1.0 eV, and for H*(4l) at 14.4 +- 1.5 eV. The analogous reactions of He/sup +/ with D/sub 2/ have also been studied to confirm these results. Secondary thresholds were also detected, and some of the reactions exhibit apparent isotope effects. Polarization is shown not to appreciably affect the cross sections for H* formation. Both H/sup +//sub 2/ and H/sup +//sub 3/, but not HeH/sup +/ or H*, are observed as products at near thermal collision energies. The experiments which resulted in the detection of the products H/sub 2//sup +/, H/sub 3//sup +/, and especially HeH/sup +/, as well as the more precise studies of H/sup +/ formation, which are reported herein, were suggested by the theoretical analysis. These results demonstrate the enhancement value of an integrated experimental--theoretical approach for the study of state-to-state chemistry.

• Research Organization: Brehm Laboratory, Wright State University, Dayton, Ohio 45435
• OSTI ID: 6789178
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 73:11; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DATA
ELEMENTS
ENERGY
ENERGY DEPENDENCE
ENERGY LEVELS
ENERGY RANGE
EV RANGE
EV RANGE 01-10
EXCITED STATES
EXPERIMENTAL DATA
HELIUM COMPOUNDS
HELIUM HYDRIDES
HELIUM IONS
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
INFORMATION
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONIZATION
IONS
MOLECULE COLLISIONS
NONMETALS
NUMERICAL DATA
POTENTIAL ENERGY
RARE GAS COMPOUNDS