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Absolute Photoionization Cross Section for O I (3P) → O II (4S°)

Published online by Cambridge University Press:  25 September 2017

J. L. Kohl ,
G. Lafayetis ,
H. P. Polenius  and
W. H. Parkinson
J. L. Kohl
Affiliation:
Center for Astrophysics, Garden Street, Cambridge, Mass 02138, U.S.A
G. Lafayetis
Affiliation:
Center for Astrophysics, Garden Street, Cambridge, Mass 02138, U.S.A
H. P. Polenius
Affiliation:
Center for Astrophysics, Garden Street, Cambridge, Mass 02138, U.S.A
W. H. Parkinson
Affiliation:
Center for Astrophysics, Garden Street, Cambridge, Mass 02138, U.S.A

Extract

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Measurements of the absolute cross section for photoionization from the 2p4 3P ground state of atomic oxygen will be described for wavelengths between the 4S° (91.2 nm) and 2D° (73.2 nm) limits. The cross section is determined from the absorption spectrum of shock heated mixtures of neon and oxygen at temperatures near 12000 K. The measured cross section will be compared to theoretical predictions and to earlier experimental work. Similar measurements of the photoionization cross section of H I which demonstrated the reliability of our windowless shock tube apparatus will be discussed briefly.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 43: Vth Conference on UV & X-Ray Spectroscopy of Astrophysical & Laboratory Plasmas , July 1977 , pp. 5
Copyright
Copyright © Crown Research Institutes 1977