Journal
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
Volume 37, Issue 2, Pages 457-470Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-4075/37/2/013
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We present the results of R-matrix Floquet calculations for generalized two- and three-photon ionization cross sections of neon and argon in the XUV region. Photoionization is strongly enhanced by singly- and doubly-excited resonances. We show that interference effects between different Rydberg states can strongly modify the photoionization cross sections. The observation of three- and four-photon resonances in the two- and three-photon spectra, respectively, demonstrates the influence from higher-order processes. The cross sections may be used to estimate the intensity attained by harmonic radiation in the XUV region.
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