Resonance-Enhanced Multiphoton Ionization in the X-Ray Regime

LaForge, Aaron C.; Son, Sang-Kil; Mishra, Debadarshini; Ilchen, Markus; Duncanson, Stephen; Eronen, Eemeli; Kukk, Edwin; Wirok-Stoletow, Stanislaw; Kolbasova, Daria; Walter, Peter; Boll, Rebecca; De Fanis, Alberto; Meyer, Michael; Ovcharenko, Yevheniy; Rivas, Daniel E.; Schmidt, Philipp; Usenko, Sergey; Santra, Robin; Berrah, Nora

doi:10.1103/physrevlett.127.213202

Title: Resonance-Enhanced Multiphoton Ionization in the X-Ray Regime

Journal Article · Fri Nov 19 00:00:00 EST 2021 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.127.213202· OSTI ID:1868364

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^[1]; Ilchen, Markus ^[3];

^[1];

^[4]; Kukk, Edwin ^[4];

^[5];

^[6]; Walter, Peter ^[7]; Boll, Rebecca ^[8]; De Fanis, Alberto ^[8]; Meyer, Michael ^[8];

^[8];

^[8]; Schmidt, Philipp ^[8];

^[8];

^[9]; Berrah, Nora ^[1]

Univ. of Connecticut, Storrs, CT (United States)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany). Center for Free-Electron Laser Science; The Hamburg Center for Ultrafast Imaging, Hamburg (Germany)
European X-ray Free-Electron Laser (XFEL), Schenefeld (Germany); Univ. Kassel (Germany). Inst. fur Physik und CINSaT
Univ. of Turku (Finland)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany). Center for Free-Electron Laser Science; Univ. Hamburg (Germany)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Univ. Hamburg (Germany)
SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
European X-ray Free-Electron Laser (XFEL), Schenefeld (Germany)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Hamburg Centre for Ultrafast Imaging (Germany); Univ. Hamburg (Germany)

In this work, we report on the nonlinear ionization of argon atoms in the short wavelength regime using ultraintense x rays from the European XFEL. After sequential multiphoton ionization, high charge states are obtained. For photon energies that are insufficient to directly ionize a 1s electron, a different mechanism is required to obtain ionization to Ar¹⁷⁺. We propose this occurs through a two-color process where the second harmonic of the FEL pulse resonantly excites the system via a 1s→2p transition followed by ionization by the fundamental FEL pulse, which is a type of x-ray resonance-enhanced multiphoton ionization (REMPI). This resonant phenomenon occurs not only for Ar¹⁶⁺, but also through lower charge states, where multiple ionization competes with decay lifetimes, making x-ray REMPI distinctive from conventional REMPI. With the aid of state-of-the-art theoretical calculations, we explain the effects of x-ray REMPI on the relevant ion yields and spectral profile.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); European Union Horizon 2020

Grant/Contract Number:: SC0012376; AC02-76SF00515; 730872

OSTI ID:: 1868364

Journal Information:: Physical Review Letters, Vol. 127, Issue 21; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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