Electron degradation and yields of initial products. VIII. Subexcitation electrons in H sub 2 and D sub 2 gases

Journal Article · Sat Jun 15 04:00:00 EDT 1991 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.460108· OSTI ID:5467171

Kimura, M; Krajcar-Bronic, I; Inokuti, M ^[1]

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1. Argonne National Laboratory, Argonne, Illinois 60439 (USA)

The moderation of subexcitation electrons in H{sub 2} and D{sub 2} is investigated by using the Spencer--Fano (SF) equation and the continuous-slowing-down approximation (CSDA). Cross-section data are adopted from the compilation by Buckman and Phelps (J. Chem. Phys. {bold 82}, 5001 (1985)). Throughout, we focus on isotope effects, i.e., differences between H{sub 2} and D{sub 2}, and consider electrons at energies appreciably higher than thermal energy. In summary, because vibrational and rotational excitation channels have lower thresholds in D{sub 2}, subexcitation-electron behavior in D{sub 2} at energies below 0.6 eV shows different characteristics from that in H{sub 2}. The moderation rate in H{sub 2} is larger than that in D{sub 2} by a factor of about 1.7. This difference is close to but not exactly the factor of 2 expected from an elementary estimate.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5467171
• Journal Information: Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 94:12; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
COLLISIONS
DEUTERIUM
ELASTIC SCATTERING
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
ENERGY LOSSES
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EV RANGE
EXCITATION
EXCITED STATES
FERMIONS
HYDROGEN
HYDROGEN ISOTOPES
ISOTOPE EFFECTS
ISOTOPES
LEPTONS
LIGHT NUCLEI
LOSSES
MILLI EV RANGE
MOLECULE COLLISIONS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
ROTATIONAL STATES
SCATTERING
SLOWING-DOWN
STABLE ISOTOPES
VIBRATIONAL STATES