Abstract

The determination of the appearance potentials from a conventional electron impact ion source, using the method of Lossing <i>et al.</i>, involves the measurement of the ion currents for the "unknown" and the reference compounds at different electron energies, when changing the energy in the small steps of 0.1 to 0.2 eV, over a 10 eV range. Carried out manually, the method is a time-consuming operation, and whereas repeated measurements are made for greater accuracy, it is not easy to guarantee steady ion-chamber conditions throughout the experiment.

Ionization Potential of O₂*

James A. R. Samson and R. B. Cairns
J. Opt. Soc. Am. 56(6) 769-775 (1966)

Laser-enhanced electron-impact ionization spectroscopy

B. A. Bushaw, B. D. Cannon, G. K. Gerke, and T. J. Whitaker
Opt. Lett. 11(7) 422-424 (1986)

Rydberg levels and ionization potential of francium measured by laser-resonance ionization in a hot cavity

S. V. Andreev, V. I. Mishin, and V. S. Letokhov
J. Opt. Soc. Am. B 5(10) 2190-2198 (1988)

First ionization potentials of lanthanides by laser spectroscopy*

E. F. Worden, R. W. Solarz, J. A. Paisner, and J. G. Conway
J. Opt. Soc. Am. 68(1) 52-61 (1978)

First-ionization potential of niobium and molybdenum by double-resonance, field-ionization spectroscopy

D. M. Rayner, S. A. Mitchell, O. L. Bourne, and P. A. Hackett
J. Opt. Soc. Am. B 4(6) 900-905 (1987)