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Resonant enhanced multiphoton ionization studies in atomic oxygen

Dixit, S. N. and Levin, D. A. and McKoy, B. V. (1988) Resonant enhanced multiphoton ionization studies in atomic oxygen. Physical Review A, 37 (11). pp. 4220-4228. ISSN 0556-2791.

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In this paper we analyze two-photon-resonant three-photon ionization of atomic oxygen via the 2p3(4S°)np3P0,1,2, and the 2p3(4S°)nf 3F2,3,4 states. The various atomic parameters required for calculating the resonant enhanced multiphoton ionization (REMPI) probabilities are obtained using quantum-defect theory. The infinite sums over nonresonant states are truncated at a finite number of terms. Our calculated two-photon excitation cross sections agree well with the results of other recent calculations and of experimental measurements. The photoionization cross section is calculated for various electron kinetic energies. The REMPI dynamics is analyzed by solving the density-matrix equations. This framework consistently takes into account the effects of saturation and ac Stark shifts. REMPI probability is seen to be quite sensitive to the initial detuning, the intensity, and the particular resonant state accessed. The photoionization cross sections also imply that due to the rapid falloff of the cross section, two-color REMPI schemes with a lower-frequency ionizing photon would increase the effective REMPI probability.

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Additional Information:©1988 The American Physical Society. Received 11 December 1987. This work was supported by the Sensors Office of the U.S. Strategic Defense Initiative Organization. The work was also supported in part under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract No. W-7405-ENG-48, and in part under the Department of Defense by the Institute for Defense Analyses under Contract No. MDA903-84-C-0031.
Issue or Number:11
Record Number:CaltechAUTHORS:DIXpra88
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6124
Deposited By: Tony Diaz
Deposited On:25 Nov 2006
Last Modified:02 Oct 2019 23:29

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