Linewidth and lifetime of atomic levels and the time evolution of spectra and coincidence spectra

Abstract

The time-dependent theory of an atomic cascade decay process is discussed. We show that it is useful to measure the spectra of the emitted particles (electrons or photons) as a function of time and introduce time-dependent spectra and time-dependent coincidence spectra. The analysis reveals that there are several timescales involved in the atomic cascades and in the respective spectra. The work prepares the ground for the discussion of molecules, clusters, and solids, where the nuclear dynamics strongly participate in the cascade decay process making it much more complex.

Photoionization of hydrogen atoms by coherent intense high-frequency short laser pulses: Direct propagation of electron wave packets on large spatial grids

“…At very early times, when the pulse arrives, the part of the wave packet which will contribute to the pho- -6 fs -3 fs 0 fs 3 fs 6 fs Radial electron density (a.u.) -9 fs -6 fs -3 fs 0 fs 3 fs 6 fs 9 fs τ = 3 fs, I 0 = 7x10 16 …”

“…In order to solve the time-dependent Schrödinger equation for the hydrogen atom interacting with a pulse we have used in our recent work [10] a previously developed theoretical approach [16][17][18][19][20][21]. In this approach the total wave function is expanded in terms of the full set of the field-free stationary states of the system.…”

Strong field control of the interatomic Coulombic decay process in quantum dots

“…Now we consider a state-resolved ansatz that was originally developed for the description of the resonant Auger decay in atoms [70,71]. From this complementary viewing angle we consolidate our recent and previous results.…”

“…In a second approach we use a state-resolved representation of the system [70,71]. This approach is based on the two relevant two-electron eigenstates |L 0 R 0 , |L 1 R 0 and the continuum |L 0 ε (cf.…”

Theory and experiment on laser-enabled inner-valence Auger decay of rare-gas atoms

“…The magnitude and shape of these sidebands change as a function of the time delay between the attosecond XUV and laser pulses, encoding information about the XUV pulse duration and underlying electron dynamics. In recent years, laser-assisted photoemission [1,2] and laser-assisted Auger decay have been used to characterize ultrafast XUV pulses, to study electron-electron correlations in atoms and molecules [3], and to measure core-hole lifetimes of atoms [4][5][6][7][8][9][10] or of adsorbates on surfaces [11]. However, in all of those studies, laser-assisted Auger decay represented a means by which an existing Auger decay channel could be modified and exploited.…”