Abstract
Multiphoton ionization (MPI) of atoms by extra photons or so-called above threshold ionization (ATI) is the one-step ionization process when atomic electron absorbs more photons than energetically necessary for ionization. We investigate ATI theoretically and our approach is based first on the method of the Sturmian expansion of the transition matrix elements developed by us earlier for MPI of H by minimum number of photons.1 Secondly, as Sturmian expansion diverges in the case of ATI, the analytical continuation of the divergent part of the radial transition matrix elements is carried out using technique similar to that proposed for the case of two-photon ATI.2–4
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References
E. Karule, Multiphoton ionization of atomic hydrogen in the ground state, in: “Atomic Processes” (in Russian), eds. R. K. Peterkop, Zinatne, Riga, pp. 5–24 (1975).
E. Karule, Two-photon ionisation of atomic hydrogen simultaneously with one-photon ionisation, J. Phys. B: At. Mol. Phys. 11, 441–447 (1978).
E. Karule, Two-photon above-threshold ionisation of atomic hydrogen in the excited states, in: “Nonlinear Processes in Two-Electron Atoms”, (in Russian), eds. N. B. Delone, Academy of Sciences, USSR, Moscow, pp. 209–235 (1984).
E. Karule, Two-photon ionisation of excited atomic hydrogen at the photoelectric threshold and above, J. Phys. B: At. Mol. Phys. 18, 2207–2218 (1985).
H. G. Muller, H. B. Linden de Heuvell, M. J. van der Wiel, Experiments on above-threshold ionization of atomic hydrogen, Phys. Rev. A34, 236–243 1986.
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© 1988 Plenum Press, New York
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Karule, E. (1988). Multiphoton Ionization of Atomic Hydrogen by Extra Photons. In: Taylor, K.T., Nayfeh, M.H., Clark, C.W. (eds) Atomic Spectra and Collisions in External Fields. Physics of Atoms and Molecules. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-1061-7_31
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DOI: https://doi.org/10.1007/978-1-4613-1061-7_31
Publisher Name: Springer, Boston, MA
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