Nonlinear atomic response to intense ultrashort x rays

G. Doumy, C. Roedig, S. K. Son, C. I. Blaga, A. D. Dichiara, R. Santra, N. Berrah, C. Bostedt, J. D. Bozek, P. H. Bucksbaum, J. P. Cryan, L. Fang, S. Ghimire, J. M. Glownia, M. Hoener, E. P. Kanter, B. Krässig, M. Kuebel, M. Messerschmidt, G. G. PaulusD. A. Reis, N. Rohringer, L. Young, P. Agostini, L. F. Dimauro

Research output: Contribution to journalArticle

175 Scopus citations

Abstract

The nonlinear absorption mechanisms of neon atoms to intense, femtosecond kilovolt x rays are investigated. The production of Ne9+ is observed at x-ray frequencies below the Ne8+, 1s2 absorption edge and demonstrates a clear quadratic dependence on fluence. Theoretical analysis shows that the production is a combination of the two-photon ionization of Ne8 + ground state and a high-order sequential process involving single-photon production and ionization of transient excited states on a time scale faster than the Auger decay. We find that the nonlinear direct two-photon ionization cross section is orders of magnitude higher than expected from previous calculations.

Original languageEnglish (US)
Article number083002
JournalPhysical Review Letters
Volume106
Issue number8
DOIs
StatePublished - Feb 24 2011
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Nonlinear atomic response to intense ultrashort x rays'. Together they form a unique fingerprint.

  • Cite this

    Doumy, G., Roedig, C., Son, S. K., Blaga, C. I., Dichiara, A. D., Santra, R., Berrah, N., Bostedt, C., Bozek, J. D., Bucksbaum, P. H., Cryan, J. P., Fang, L., Ghimire, S., Glownia, J. M., Hoener, M., Kanter, E. P., Krässig, B., Kuebel, M., Messerschmidt, M., ... Dimauro, L. F. (2011). Nonlinear atomic response to intense ultrashort x rays. Physical Review Letters, 106(8), [083002]. https://doi.org/10.1103/PhysRevLett.106.083002