Abstract

Several examples of the relationship between resonant and nonresonant collisional ionization and photoionization, laser intensity, and the ability to saturate both resonant and nonresonant transitions are illustrated. The effects of energy deficit and effective energy overshoot in determining the dominant ionization pathway are also discussed. An approximation of the lifetime of the virtual level is made, and its relationship to the probability of two-photon nonresonant absorption is discussed. Finally, the theoretical model described above is fitted to the optogalvanic data for two single-step resonance transitions of Ne to determine the applicability of the model developed for flame LEI to the hollow cathode discharge environment (under our experimental conditions) and to obtain estimates of the collisional ionization rate constant, κ_2<i>i</i>, and photoionization cross section, σ_2<i>i</i>.

Studies on laser-assisted Penning ionization by the optogalvanic effect in Ne/Eu hollow cathode discharge

V. K. Saini, P. Kumar, S. K. Dixit, and S. V. Nakhe
Appl. Opt. 54(4) 595-602 (2015)

Studies on pulsed optogalvanic effect in Eu/Ne hollow cathode discharge

V. K. Saini, P. Kumar, S. K. Dixit, and S. V. Nakhe
Appl. Opt. 53(19) 4320-4326 (2014)

Mechanistic study of the optogalvanic effect in a hollow-cathode discharge

C. Drèze, Y. Demers, and J. M. Gagné
J. Opt. Soc. Am. 72(7) 912-917 (1982)

Optogalvanic effect in a hollow cathode discharge with nonlaser sources

Charles T. Apel, Richard A. Keller, Edward F. Zalewski, and Rolf Engleman
Appl. Opt. 21(8) 1465-1467 (1982)

Optogalvanic detection of the Zeeman effect in a hollow-cathode discharge

Etienne Langlois and Jean-Marie Gagné
J. Opt. Soc. Am. B 4(7) 1222-1226 (1987)