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Advances In Atomic, Molecular, and Optical Physics, Vol. 29 by Sir David Bates (ed.), Benjamin Bederson (ed.)

By Sir David Bates (ed.), Benjamin Bederson (ed.)

This sequence, tested in 1965, is worried with contemporary advancements within the basic sector of atomic, molecular and optical physics. the sector is in a country of quick progress, as new experimental and theoretical strategies are positioned to undergo on many elderly and new difficulties. Such difficulties variety from stories of the basic houses of radiation and subject, via reports of hitherto inaccessible states of "ordinary" and unique atoms and molecules, the keep an eye on of atoms and molecules via mild, the behaviour of atoms and molecules in extreme radiation fields, the exact constitution of such structures, together with complicated molecules and molecular clusters, and quite a lot of interplay phenomena between atoms, molecules, their constituent elements and fields. subject matters lined comprise similar utilized components, similar to atmospheric technology, astrophysics, floor physics and laser physics.

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As it is for photoionization, in the case of multiphoton ionization the radiation frequency is a free parameter that can vary continuously. Accordingly, in both cases the tabulation of the cross sections is out of the question, in contrast to single- and multiphoton excitation. The problem is to develop the methods for theoretical description of direct multiphoton ionization and to optimize these methods by comparing the results they give with experimental data. When Eqs. (2)-(5) are satisfied, a quantitative description to the direct process of multiphoton ionization is traditionally given by means of the nonstationary perturbation theory in the first nonvanishing (Kth) order (Delone and Krainov, 1985; Faisal, 1987).

References . . . . . . . . . . . . . . ~ 111. IV. V. VI. . . .. . . . . . 45 45 46 51 55 61 63 64 65 . 73 . 76 . 77 . 79 . 81 . 83 . 84 . . 87 . 88 . 90 . . 101 107 108 33 English translation copyright 0 1992 by Academic Press. Inc. All rights of reproduction in any form reserved. ISBN 0-12003829-3 34 Ammosov, Delone, and Ivanov I. Introduction This chapter is devoted to cross sections of direct multiphoton ionization of atoms. ) We discuss the methods used to measure these cross sections, the experimental results obtained, and the theoretical relations that enable one to estimate the magnitude of multiphoton cross sections.

They have used the LIF method to study resonance structure in cross sections for the electron excitation of the Is, and Is, levels, and they also have measured the cross sections for electron excitation into a single m,-state of the ls, level. The results they obtained show resonance structure in both the Is, and Is, cross sections. There are also several nonoptical measurements of the electron excitation cross sections for the metastable Is, and Is, levels of Ne. A. They normalized their cross sections to those of Teubner et at.

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