Time-of-flight study of H(2S) and D(2S) produced by electron impact on H/sub 2/ and D/sub 2/: Fast peaks

Journal Article · Sat Nov 01 04:00:00 EST 1980 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.22.1906· OSTI ID:6847884

Spezeski, J J; Kalman, O F; McIntyre, Jr, L C

Time-of-flight spectra of H(2S) and D(2S) fragments from electron-bombardment dissociated H/sub 2/ and D/sub 2/ have been observed. Kinetic energy distributions of ''fast'' metastable fragments were obtained for electron-bombardment energies ranging from near the threshold for fast metastable production (less than 29 eV) to 100 eV. At low bombarding energies previously unreported structure is observed in the fast peaks for both isotopes. At high bombarding energies also there is evidence of unresolved structure in the fast peaks. The present data are compared with the results of earlier investigations. At low bombarding energies there are significant discrepancies between the present results and previous measurements. At high bombarding energies there is significant disagreement with a calculation that assumes a single dissociating state. The observed shift of the fast peak as a function of the bombarding electron energy is compared to predictions incorporating a form of the Wannier law. This comparison tends to confirm the presence of more than one dissociation channel yielding fast metastables. Several excited states of H/sub 2/ and H/sub 2/ /sup +/ are discussed as possible dissociation channels contributing to the observed kinetic energy distributions.

• Research Organization: Department of Physics, University of Arizona, Tucson, Arizona 85721
• OSTI ID: 6847884
• Journal Information: Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 22:5; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
COLLISIONS
DEUTERIUM
DISSOCIATION
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ELEMENTS
ENERGY
ENERGY LEVELS
ENERGY RANGE
ENERGY SPECTRA
EV RANGE
EV RANGE 10-100
EXCITED STATES
HYDROGEN
HYDROGEN ISOTOPES
ISOTOPES
KINETIC ENERGY
LIGHT NUCLEI
METASTABLE STATES
MOLECULE COLLISIONS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
S STATES
SPECTRA
STABLE ISOTOPES
TIME-OF-FLIGHT METHOD