Theory of ultrafast autoionization dynamics of Fano resonances

Journal Article · Mon Nov 15 04:00:00 EST 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.053415· OSTI ID:21528675

Chu, W -C; Lin, C D ^[1]

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1. J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506 (United States)

We study atomic autoionization processes in the time domain. With the emerging attosecond extreme vacuum ultraviolet and soft x-ray pulses, we first address how to characterize the time evolution of the decay of a discrete state into a degenerate continuum. A short pump beam generates a number of resonance states in a series and the nearby background continuum, and the resultant wave packet evolves with time until the full decay of the bound states. Taking the 2pns({sup 1}P{sup o}) resonance series embedded in the 2s{epsilon}p({sup 1}P{sup o}) continuum in a beryllium atom as an example, the time evolution of the autoionizing wave packet in the energy domain and in coordinate space is calculated and analyzed, where Fano profiles build up in the photoelectron energy during the process. A proposed pump-probe scheme assumes that the probe beam ionizes the 2s inner electron in the wave packet. The lifetimes of the resonances and the photoelectron energy distribution can be obtained from the ionization yield vs. the time delay of the probe.

• OSTI ID: 21528675
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 82; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ALKALINE EARTH METALS
AUTOIONIZATION
BEAMS
BERYLLIUM
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
ENERGY SPECTRA
FERMIONS
IONIZATION
IONIZING RADIATIONS
LEPTONS
LIFETIME
METALS
PULSES
RADIATIONS
RESONANCE
S STATES
SOFT X RADIATION
SPECTRA
TIME DELAY
ULTRAVIOLET RADIATION
WAVE PACKETS
X RADIATION