Nonsequential two-photon absorption from the K shell in solid zirconium

Shambhu Ghimire, Matthias Fuchs, Jerry Hastings, Sven C. Herrmann, Yuichi Inubushi, Jack Pines, Sharon Shwartz, Makina Yabashi, David A. Reis

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38 Scopus citations

Abstract

We report the observation of nonsequential two-photon absorption from the K shell of solid Zr (atomic number Z=40) using intense x-ray pulses from the Spring-8 Angstrom Compact Free-Electron Laser (SACLA). We determine the generalized nonlinear two-photon absorption cross section at the two-photon threshold in the range of 3.9-57 ×10-60cm4s bounded by the estimated uncertainty in the absolute intensity. The lower limit is consistent with the prediction of 3.1 ×10-60cm4s from the nonresonant Z-6 scaling for hydrogenic ions in the nonrelativistic, dipole limit.

Original languageEnglish
Article number043418
JournalPhysical Review A
Volume94
Issue number4
DOIs
StatePublished - 21 Oct 2016

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Publisher Copyright:
© 2016 American Physical Society.

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