Velocity distribution of H(2s) resulting from the electron impact dissociation of H/sub 2/

Journal Article · Wed Jun 15 04:00:00 EDT 1977 · J. Chem. Phys.; (United States)

OSTI ID:7216441

Hazi, A U; Wiemers, K

We have calculated the velocity distribution of the fast, metastable hydrogen and deuterium atoms which result from the dissociation of the /sup 1/Pi/sub u/(2p..pi../sub u/, 2ssigma/sub g/) autoionizing states of H/sub 2/ and D/sub 2/. The present model uses the previously computed potential energy curve and autoionization width of this doubly excited /sup 1/Pi/sub u/ state. The model treats the competition between ionization and dissociation into neutral fragments classically. In calculating the laboratory velocity distribution we take into account the thermal motion of the target molecules and the recoil due to the scattered electron. The effect of momentum transfer is important, as the calculated laboratory speed distribution depends sensitively on the angle of detection. The comparison of the experimental and the theoretical velocity distributions shows a significant discrepancy among the three measurements which have been reported to date.

• Research Organization: University of California, Lawrence Livermore Laboratory, P. O. Box 808, Livermore, California 94550
• OSTI ID: 7216441
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 66:12; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
COLLISIONS
CRYOGENIC FLUIDS
DEUTERIUM
DISSOCIATION
DISTRIBUTION
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
HYDROGEN
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
MOLECULE COLLISIONS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
STABLE ISOTOPES
VELOCITY