Theoretical analysis of angular correlation between the photoelectron and subsequent polarized fluorescent photon in atomic photoionization

Кабачник, Н. М.; Ueda, K.

doi:10.1088/0953-4075/28/23/011

Cited by 18 publications

(23 citation statements)

References 15 publications

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“…A new type of complete photoionization experiments of this kind has only recently been reported based upon a coincidence analysis of photoelectrons and flourescence photons from the decay of exited 2 P 3͞2 -state ions [15,16]. Using a combination of linearly and circularly polarized synchrotron radiation for the ionization provided relative s-and d-wave amplitudes and their phase differences (including the sign) [17].The theoretical model in which the latter experiments may be regarded as complete is the validity of LS coupling which is a good approximation in the case of photoionization of light atoms. The necessity of subsequent Auger or flourescence decay, however, limits these methods to inner-shell photoionization.…”

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Magnetic Dichroism in the Angular Distribution of Atomic Oxygen2pPhotoelectrons

et al. 1996

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A substantial difference in the angular distributions of 2p photoelectrons from polarized oxygen atoms was found for two antiparallel atomic polarizations. This magnetic dichroism was studied as a function of photon energy from 25 to 52 eV. Our method extends traditional photoelectron angular distribution measurements of open shell atoms to "complete" experiments in similar to spin-resolved measurements. The observed dichroism allows a determination of the dipole matrix elements for the es and ed photoelectrons and their phase difference including the sign. [S0031-9007(96)01267-7] PACS numbers: 32.80.Fb Photoionization and atomic collision processes can be completely described quantum mechanically by a limited number of amplitudes and their phase differences and thus the experiment from which the relevant amplitudes and phases can be extracted has been referred to as a "complete" experiment [1,2]. This possibility was first realized in the early electron-atom collision experiments of Eminyan et al. [3] and Standage and Kleinpoppen [4]. The first complete experiment in photoionization of atoms in the dipole approximation was reported by Heinzmann and co-workers [5,6], who measured the angular distribution and the spin polarization of photoelectrons for Xe 5p photoionization. The complete information in the latter experiment is obtained from the spin polarization of the photoelectron (providing up to three further parameters of the photoionization process besides the cross section and angular distribution). The first experiment of this kind was followed by a series of further studies with a main emphasis on rare gas atoms. A complementary method for complete atomic photoionization experiments employs the polarization of the target atoms. The sensitivity of this method to additional photoionization parameters depends on the target preparation instead of the detection sensitivity to spin polarization. We refer for this class of experiments to the work of Klar and Kleinpoppen concerning the complete analysis of the relevant amplitudes and phases [7]. Successful experiments using polarized targets have first been reported [8-11] using laser excitation for the preparation of the initial state. However, these experiments focused predominantly on resonant photoionization processes where the information on matrix elements and phases is largely reduced. An alternative approach to such a complete analysis of nonresonant photoionization has been reported by Hausmann et al. [12] and Becker [13]; in their photoionization experiments on atomic magnesium and argon the angular distributions of the photoelectrons and Auger electrons provide the angular distribution asymmetry parameter b and the alignment parameter A 20 . These quantities together with the partial photoionization cross section s make it possible to derive matrix elements for continuum s and d electrons and the cosine of their relative phase. Related experiments employ the polarization of the fluorescence radiation instead of the angular distribution of the Auger ele...

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Magnetic Dichroism in the Angular Distribution of Atomic Oxygen2pPhotoelectrons

et al. 1996

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“…Gail et al [14] have calculated the anisotropy parameter of the angular distribution of E1 radiation emitted after resonant transfer and excitation of U 90þ with graphite target. In the case of the ionization of randomly oriented atoms, Kabachnik and Ueda [15] have accomplished theoretical analysis of angular correlation between photoelectron and subsequent polarized fluorescent photons. The dependence of the intensity of X-ray fluorescence radiation on the opposite orientations of the angular momentum of an atom was also investigated by a number of authors for the case of circularly (see [16]) and linearly [17] polarized radiation.…”

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Angular Distribution of Radiation Following Photoionization of Polarized Atoms

Kupliauskiene¹,

Tutlys²

2004

Phys. Scr.

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A method alternative to the density matrix formalism is applied to derive a general expression for the radiative decay probability following the photoionization of polarized atoms in two-step approximation. The graphical technique of the angular momentum theory is used for the integration over angular and spin variables. The general expression joining both steps of photoionization and fluorescence contains the possibility to investigate the polarization of all particles in the initial and final states and the angular distributions as well as angular correlations of photoelectrons and radiation. A simple way to get the expressions for special cases of the angular distribution and polarization of fluorescence radiation in the photoionization of randomly orientated and polarized atoms is given as an example of the practical application of the general formula.

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“…In this theory, the electron, both in continuum and bound states, is described by the relativistic Dirac wave functions and all higher (nondipole) terms in the expansion of the electronphoton interaction are taken into account. In comparison to the results of this theory in the nonrelativistic limit, where the electron-photon interaction is restricted to the electric dipole term and the electron wave functions are approximated by the Schrödinger solutions [36], one can derive…”

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Observation of Coherence in the Time-Reversed Relativistic Photoelectric Effect

et al. 2014

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The photoelectric effect has been studied in the regime of hard x rays and strong Coulomb fields via its time-reversed process of radiative recombination (RR). In the experiment, the relativistic electrons recombined into the 2p 3=2 excited state of hydrogenlike uranium ions, and both the RR x rays and the subsequently emitted characteristic x rays were detected in coincidence. This allowed us to observe the coherence between the magnetic substates in a highly charged ion and to identify the contribution of the spin-orbit interaction to the RR process.

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Theoretical analysis of angular correlation between the photoelectron and subsequent polarized fluorescent photon in atomic photoionization

Cited by 18 publications

References 15 publications

Magnetic Dichroism in the Angular Distribution of Atomic Oxygen2pPhotoelectrons

Magnetic Dichroism in the Angular Distribution of Atomic Oxygen2pPhotoelectrons

Angular Distribution of Radiation Following Photoionization of Polarized Atoms

Observation of Coherence in the Time-Reversed Relativistic Photoelectric Effect

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