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He in two-color AC-fields of lambda(1)=248 nm and lambda(2) = (1/m) 248 nm, m=2,3,4. The rate of multiphoton ionization, for weak fields, is a simple function of the phase

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He in two-color AC-fields of lambda(1)=248 nm and lambda(2) = (1/m) 248 nm, m=2,3,4. The rate of multiphoton ionization, for weak fields, is a simple function of the phase (EN)
Nicolaides, CA (EN)
Mercouris, T (EN)
journalArticle (EN)
2014-03-01T01:51:09Z
2001 (EN)
Multiphoton ionization rates for He irradiated by a dichromatic AC-field consisting of the fundamental wavelength lambda = 248 nm and its second, third and fourth higher harmonics have been computed. The calculations incorporated systematically electronic structure and electron correlation effects in the discrete and in the continuous spectrum. They were done by implementing a time-independent. nonperturbative many-electron, many-photon theory (MEMPT) which obtains cycle-averaged complex eigenvalues, whose imaginary part is the multiphoton ionization rate, Gamma. It is shown that, provided the intensities are weak, the dependence of Gamma on phase difference phi (2), is simple. Specifically, for odd higher harmonics, Gamma varies linearly with cos(phi (2)) whilst for even higher harmonics it varies linearly with cos(acp,). These relations may turn out to be applicable to other atomic systems as well. and provide a definition of the weak-field regime in the dichromatic case. When the intensities are such that higher powers of cos(phi (2)) and cos(2 phi (2)) become important, these rules break down and we reach the strong-field regime. (C) 2001 Elsevier Science B.V. All rights reserved. (EN)
Physics, Condensed Matter (EN)
PHOTOIONIZATION (EN)
FREQUENCIES (EN)
HYDROGEN (EN)
EXCITATION (EN)
multiphoton ionization (EN)
ANGULAR-DISTRIBUTIONS (EN)
2-COLOR IONIZATION (EN)
INTERFERENCE (EN)
ABOVE-THRESHOLD IONIZATION (EN)
coherent control of ionization (EN)
INTENSE LASER FIELD (EN)
UNIMOLECULAR REACTIONS (EN)
PHYSICA B (EN)
English
ELSEVIER SCIENCE BV (EN)
National Technical University of Athens
Digital Library of National Technical University of Athens | Dspace@NTUA
Κεντρική Βιβλιοθήκη Ε.Μ.Π.
Ιδρυματικό Αποθετήριο
Δημοσιεύσεις μελών Δ.Ε.Π. σε περιοδικά



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