The photo-ionization cross-section of neon

Author:

Abstract

The absorption of radiation of wave-length between 230 and 800 Å in neon was measured photometrically in a grazing incidence vacuum spectrograph. For wave-lengths longer than that corresponding to the first ionization limit the absorption coefficients were found to be zero except for photo-excitation of resonance transitions. Two sharp absorption edges were observed at 575 and 256 Å corresponding to the L 3 - and L 1 -edges respectively with a flat maximum between them. The photo-ionization cross-section at the first ionization limit was found to be 5⋅4 x 10 -18 cm 2 independent of the pressure between 50 and 500 μ ; this should be compared with the theoretical value of 5⋅8 x 10 -18 cm 2 obtained by Seaton using a dipole-length approximation. Between 575 and 400 Å the calculated and experimental curves agreed closely within the limits of measurement.

Publisher

The Royal Society

Subject

Pharmacology (medical)

Reference7 articles.

1. Condon E. U. & Shortley G. H. 1951 The theory of atomic structure. Cambridge University Press.

2. Lee Po & Weissler G. L. 1952

3. A Constant Intensity Vacuum Spectroscopic Light Source

4. Moore C. E. 1949 Atomic energy levels 1 76. Washington: National Bureau of Standards.

5. Proc. Roy;Seaton M. J.;Soc. A,1951

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