Phys. Rev. Lett. 98, 143601 (2007) [4 pages]Quantum State-Resolved Probing of Strong-Field-Ionized Xenon Atoms Using Femtosecond High-Order Harmonic Transient Absorption SpectroscopyReceived 19 January 2007; published 5 April 2007 Femtosecond high-order harmonic transient absorption spectroscopy is used to resolve the complete |j,m⟩ quantum state distribution of Xe+ produced by optical strong-field ionization of Xe atoms at 800 nm. Probing at the Xe N4/5 edge yields a population distribution ρj,|m| of ρ3/2,1/2∶ρ1/2,1/2∶ρ3/2,3/2=75±6 :12±3 :13±6%. The result is compared to a tunnel ionization calculation with the inclusion of spin-orbit coupling, revealing nonadiabatic ionization behavior. The sub-50-fs time resolution paves the way for tabletop extreme ultraviolet absorption probing of ultrafast dynamics. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.143601
DOI:
10.1103/PhysRevLett.98.143601
PACS:
42.50.Hz, 32.80.Rm, 42.65.Ky, 82.53.−k
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