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Excitation of the E,F/sup 1/. sigma. /sup +//sub g/ states of H/sub 2/ by electron impact

Journal Article · · J. Chem. Phys.; (United States)
OSTI ID:7304642
;

Optical excitation functions produced by low-energy electron impact excitation are reported for several rotational lines originating from the E,F/sup 1/..sigma../sup +//sub g/ and the H/sup 1/..sigma../sup +//sub g/ electronic states of neutral H/sub 2/. The E/sup 1/..sigma../sup +//sub g/..-->..B/sup 1/..sigma../sup +//sub u/, F/sup 1/..sigma../sup +//sub g/..-->..B/sup 1/..sigma../sup +//sub u/, and H/sup 1/..sigma../sup +//sub g/ ..-->..B/sup 1/..sigma../sup +//sub u/ band systems are observed at an effective spectral slit width of < or =2 A, over an electron energy range 0--300 eV. The observed transitions are identified as originating from v'=2,3,4 vibrational levels of the E state, the v'=5 level of the F state, and the v'=2 level of the H state. Absolute emission cross section measurements are obtained at 200 eV electron energy and 30 mtorr H/sub 2/ gas pressure through direct comparison with the lambda=4686 A (n=4..-->..3) line of the He II spectrum. Analysis of the E..-->..B (2,1) R0 rotational line intensity yields (1.0 +- 0.3) x 10/sup -18/ cm/sup 2/ as a lower-limit estimate of the E/sup 1/..sigma../sup +//sub g/ direct cross section at 200 eV.

Research Organization:
Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701
OSTI ID:
7304642
Journal Information:
J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 66:9; ISSN JCPSA
Country of Publication:
United States
Language:
English

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Related Subjects

640304* -- Atomic
Molecular &amp; Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
COLLISIONS
CROSS SECTIONS
CRYOGENIC FLUIDS
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EV RANGE
EV RANGE 10-100
EV RANGE 100-1000
EXCITATION FUNCTIONS
EXCITED STATES
FLUIDS
HYDROGEN
MOLECULE COLLISIONS
NONMETALS
ROTATIONAL STATES