The interference effects in the alignment and orientation of the Kr II 4p⁴5p states following Kr I 3d⁹np resonance excitation

Abstract

The energy dependence of the alignment parameter A20 for the Kr II 4p45p(E 1J1) states following excitation in the Raman regime with the exciting-photon energy passing through the Kr I 3dJ̄9npj̄ resonances was investigated theoretically and experimentally. Interference between the resonance and direct photoionization channels explains the dependence of A20 on the excitation energy. Experimentally, A20 was determined after the analysis of 5p–5s fluorescence decay of the 4p45p(E 1J1) states excited with monochromatized synchrotron radiation. The band pass of the synchrotron radiation was set to 10 meV which is smaller than the natural width of the 3d9np resonances (∼83 meV). Additionally, a strong energy dependence was predicted for the orientation parameter O10 as well as for the angular distribution parameter of photoelectrons, βe, for several 4p45p(E 1J1) ionic states.

Coherence and correlations in photoinduced Auger and fluorescence cascades in atoms

“…Angular distribution Demekhin et al, 2005) and polarization Meyer et al, 2001aMeyer et al, , b, 2002O'Keeffe et al, 2003O'Keeffe et al, , 2004Schill et al, 2003;Lagutin et al, 2003a, b;Schartner et al, 2005) of the ion fluorescence after the Auger decay was extensively studied during the last years for noble gas atoms. In order to illustrate the polarization analysis we take the resonant Auger process in Xe, when the 4d −1 5/2 6p J = 1 state is photoexcited at h = 65.1 eV.…”

“…Although the experimental observation of the effect is not straightforward due to the small cross section between the resonances, the appearance of such phenomena can be revealed in combination with theoretical calculations. Such an example is provided by Lagutin et al (2003a, b) and Schartner et al (2005Schartner et al ( , 2007 for alignment and orientation of the Kr II 4p 4 5p states following Kr 3d −1 5p/6p resonance excitation.…”

“…Dependence of the alignment and orientation parameters on the excitation energy in the region of the Kr (J =1) Auger states: 4d −1 5/2 5p 3/2 (R1), 4d −1 5/2 6p 3/2 (R4), and perceptible mixtures of the 4d −1 5/2 5p 1/2,3/2 states (R2, R3). Open circles, experimental data from Lagutin et al (2003a) and Schartner et al (2005). Horizontal bars with lengths equal to the natural widths (the resonance R3 is negligible) indicate parameters computed within the two-step model for isolated resonance.…”

Strong interference effects in the angularly resolved Auger decay and fluorescence emission spectra of the core-excited NO molecule

“…The photon-induced fluorescence spectroscopy (PIFS) has already been applied for polarization analysis of atomic fluorescence [4,23] and for studying core-excited molecules [8,18]. The present experimental setup is similar to experiments of [18,23].…”

“…Alignment and orientation of the residual ion are usually obtained from angular distribution or polarization analysis of fluorescence emitted by a subsequent relaxation of the ion [2,3,4]. On the other hand, fluorescence experiments only allow a partial wave analysis of the emitted photoelectron waves [5,6].…”