Strong nondipole effect created by multielectron correlation in5sphotoionization of xenon

Abstract

The angular distribution of the Xe 5s photoelectrons was measured in the 90-225 eV photon energy range using linearly polarized synchrotron radiation. The experimentally determined angular distribution parameters were compared with theoretical values obtained from calculations based on the random-phase approximation and the time-dependent density-functional theory. Experiment shows that the dipole ͑␤͒ and nondipole ͑␥͒ parameters vary strongly as a function of the photon energy, in accordance with calculations that account for the interchannel coupling. Nondipole effects observed clearly in experiment confirm the role of multielectron correlation in describing the 5s photoionization of Xe far from the ionization threshold.

Dramatic Nondipole Effects in Low-Energy Photoionization: Experimental and Theoretical Study of Xe5s

“…We emphasize further refinements in theory are required to achieve quantitative agreement with experiment. Finally, P H Y S I C A L R E V I E W L E T T E R S week ending 1 AUGUST 2003 note that a very recent measurement of the Xe 5s nondipole parameter in the 150 eV region [35] shows qualitatively similar effects to the present results, but there are significant quantitative differences which we do not, as yet, understand.…”

Low-Energy Nondipole Effects in Molecular Nitrogen Valence-Shell Photoionization

“…Considerable recent evidence indicates, however, that this approximation can be inadequate for interpretations of atomic photoelectron angular distributions at surprisingly low photon energies. Specifically, nondipole effects firstorder in photon momentum have been observed in the 1-3 keV photon energy region in Ar and Kr [17,18], in the hundreds-of-eV range and below in Ne and Xe [19][20][21], and as low as 13 eV in the case of Cd [22], behaviors largely confirmed by theory [23][24][25][26][27][28][29]. The measured and calculated angular distributions exhibit considerable sensitivity to the presence of Cooper minima, to the nature of the potential more generally, and to electronic channel coupling in certain cases, effects which all give rise to prominent features in the angular asymmetry parameters at relatively low photon energies.…”

Nondipole effects in soft X-ray photoemission

“…In this case, P x ¼ P transf and P z ¼ P long : Copyright r 2001 IOP Publishing Ltd. (Kr. assig et al, 2002;Kanter et al, 2003), for Ne 2s and 2p in the 150-1200 eV range (Hemmers et al, , 1997aLindle et al, 1997;Hemmers et al, 2002), and for Xe 5s in the 26-200 eV range Ricz et al, 2003). The nondipole parameter g for Xe 5s is shown in Fig.…”

“…Adapted from Fig. 1 from Hemmers et al (2003) showing Xe 5s nondipole asymmetry parameters g measured at SRC (open circles) and ALS (closed circles) compared with data from Ricz et al (2003) (open triangles) and with Hartree-Fock (HF), random-phase approximation with exchange (RPAE), and relativistic random-phase approximation (RRPA) calculations.…”

“…Because the electrons are detected in the ðx; zÞ plane, dipole and nondipole contributions cannot be separated directly in the measurement; a fitting procedure for the measured angle-resolved intensities has to be used to determine the angular-distribution parameters b; d; and g; as shown in Fig. 7 (Ricz et al, 2003). Guillemin et al (2002) used a double-toroidal analyzer (DTA) originally designed for Auger-electron/ ion coincidence experiments (Miron et al, 1997;Guillemin et al, 2000) to conduct the first, and, so far, only experimental study on nondipole effects from fixedin-space molecules.…”