Effect of Relativistic Many-Electron Interactions on Photoelectron Partial Wave Probabilities

The alignment of Au + ions following L 3 photoionization has been studied using a high-resolution x-ray spectrometer. We observed a small anisotropy for the angular dependence of Au L ι and Lα emissions. The alignment parameter A 20 derived from the experimental results is compared with theoretical calculations by Hartree-Fock approximation and random phase approximation with exchange. The contribution to the alignment of quadrupole interaction is discussed.

Section: Introductionsupporting

confidence: 62%

Alignment following Au L₃photoionization by synchrotron radiation

Yamaoka

Oura

Kondo

et al. 2003

“…Downstream from the interaction region, its intensity was monitored by a calibrated photodiode (IRD AXUV100). The collision chamber and fl uorescence detection apparatus have been described previously [20], but both were modifi ed from the original set-up as described below.…”

Section: Methodsmentioning

confidence: 99%

Production of excited atomic hydrogen and deuterium from H2 and D2 photodissociation

Bozek¹,

Furst²,

Gould³

et al. 2008

We have measured the production of both Lyα and Hα fl uorescence from atomic H and D for the photodissociation of H 2 and D 2 by linearly polarized photons with energies between 24 and 60 eV. In this energy range, excited photofragments result primarily from the production of doubly excited molecular species which promptly autoionize or dissociate into two neutrals. Our data are compared with ab initio calculations of the dissociation process, in which both doubly excited state production and prompt ionization (non resonant) channels are considered. Agreement between our experimental data and that of earlier work, and with our theoretical calculations, is qualitative at best.

“…As third generation synchrotrons have come on line, the possibility of making such measurements in this energy range with resolution of a few meV-comparable to absorption measurements [1,2]-has been realized. More recently, polarization analysis of the fluorescence has been shown to have the ability to yield even finer detail about the final state of the photoionization reaction by identifying outgoing electron partial waves and/or the alignment and orientation of the residual ion [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Use of partial-wave decomposition to identify resonant interference effects in the photoionization–excitation of argon

Greene

Machacek

McLaughlin

et al. 2009

We have studied simultaneous photoionization and excitation of Ar in the range of incident photon energies between 36.00 and 36.36 eV, where the resonant production of doubly excited neutral Ar states imbedded in the ionization continuum is dominant. By measuring the relative Stokes parameters of the fluorescence from residual Ar + * (3p 4 [ 3 P] 4p) ions (2 P 1/2 , 465.8 nm transition; 2 P 3/2 , 476.5 nm; 2 D 3/2 , 472.7 nm; 2 D 5/2 , 488.0 nm; 4 P 5/2 , 480.6 nm; 4 D 5/2 , 514.5 nm) we demonstrate a technique for determining individual partial-wave cross sections in photoionizing collisions. This procedure is shown to be important in sorting out competing dynamical ionization mechanisms, particularly with regard to resonant production of intermediate doubly excited autoionizing states. Comparison with theoretical photoionization cross sections demonstrates that spin-orbit coupling between different states of Ar II needs to be accounted for in the calculations.