Evidence for unnatural-parity contributions to electron-impact ionization of laser-aligned atoms

Armstrong, Gregory; Colgan, J.; Pindzola, M. S.; Amami, Sadek; Madison, Don H.; Pursehouse, James; Nixon, Kate; Murray, Andrew

doi:10.1103/physreva.92.032706

Cited by 5 publications

(8 citation statements)

References 32 publications

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“…Also, when alignment of the quantization axis was perpendicular to the scattering plane, theory predicted zero cross section, while experiment did not [1]. In follow-up work, Armstrong et al [2] found that the non-zero cross section comes from unnatural parity contributions. However, no study of the partial wave contributions to the cross sections has been performed until now.…”

Section: Introductionmentioning

confidence: 98%

“…They also provide information about the structure of the target atoms, and represent a stringent test of current theoretical models. In most cases, the initial state orientation is determined [1][2][3][4], however, a recent study has examined a collision process in which the final state ion is oriented [5]. In the case of oriented targets in the initial state, most of the work has been focused on oriented molecules.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of oriented targets in the initial state, most of the work has been focused on oriented molecules. However, recently fully differential cross sections (FDCSs) have been measured for oriented magnesium atoms [2,3,6]. In this case, a linearly polarized laser was used to excite the atom to an oriented 3p state, and subsequently FDCSs for ionization were measured.…”

Section: Introductionmentioning

confidence: 99%

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Partial wave analysis of oriented collisions

Harris¹,

Amami²,

Saxton³

et al. 2017

J. Phys. B: At. Mol. Opt. Phys.

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We present fully differential cross sections (FDCSs) for two collision processes with oriented atoms. The first collision is electron-impact ionization of oriented Mg (3p), and the second collision is electron-impact excitation-ionization (EI) of helium with an oriented final state He + (2p0) ion. Surprisingly, the theoretical functional form of the FDCS is the same for both processes, despite the fact that the only physical similarity is an oriented excited state in both processes. We present FDCS as a function of orientation angle and ejected electron angle for both ionization of oriented Mg(3p) and EI of helium in order to explore possible physical similarities between the two processes. We examine the contributions to the FDCS of individual partial waves of the ionized electron and projectile. For the ionization of oriented Mg, we show that the FDCS are dominated by larger partial waves of the ejected electron, with the dominant partial waves having a dependence on scattering angle and outgoing electron energy sharing. For the EI process, the FDCS is dominated by the L=2 partial wave, independent of scattering angle or energy sharing. Also, for EI it is possible to have angular momentum transferred from either the target helium atom or the incident projectile.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Partial wave analysis of oriented collisions

Harris¹,

Amami²,

Saxton³

et al. 2017

J. Phys. B: At. Mol. Opt. Phys.

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“…Their laser-excited P-states can then be aligned in different directions with respect to the collision frame (see figure 5), thereby producing a four-fold cross section (QDCS) that depends on the incident electron momentum k 0 , the scattered and ejected electron momenta (k 1 , k 2 ), and the alignment of the excited atom k B . Comparison of the measured QDCS to theoretical calculations can then be made [21][22][23][24].…”

Section: University Of Manchester United Kingdommentioning

confidence: 99%

Roadmap on photonic, electronic and atomic collision physics: II. Electron and antimatter interactions

Schippers

Sokell

Aumayr

et al. 2019

J. Phys. B: At. Mol. Opt. Phys.

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We publish three Roadmaps on photonic, electronic and atomic collision physics in order to celebrate the 60th anniversary of the ICPEAC conference. In Roadmap II we focus on electron and antimatter interactions. Modern theoretical and experimental approaches provide detailed insight into the many body quantum dynamics of leptonic collisions with targets of varying complexity ranging from neutral and charged atoms to large biomolecules and clusters. These developments have been driven by technological progress and by the needs of adjacent areas of science such as astrophysics, plasma physics and radiation biophysics. This Roadmap aims at looking back along the road, explaining the evolution of the field, and looking forward, collecting contributions from eighteen leading groups from the field.

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“…The study of ionizing collisions involving oriented targets has become more prevalent in recent years with improvements in experimental technology and computational power [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Anisotropy in excitation-ionization double-differential cross sections

Harris

Saxton

2018

Phys. Rev. A

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Simultaneous ionization and excitation of helium by electron impact is studied through ejected electron angle integrated double differential cross sections (DDCS) as a function of ionized electron energy using the 4-Body Distorted Wave model. Results are presented for different alignments of the 2p0 magnetic substate of the He + ion, and alignment effects observed in fully differential cross sections are shown to persist in the DDCS. Examination of the DDCS for different orientations leads to a determination of anisotropy parameters and phase angles between substate amplitudes as a function of ejected electron energy.

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Evidence for unnatural-parity contributions to electron-impact ionization of laser-aligned atoms

Cited by 5 publications

References 32 publications

Partial wave analysis of oriented collisions

Partial wave analysis of oriented collisions

Roadmap on photonic, electronic and atomic collision physics: II. Electron and antimatter interactions

Anisotropy in excitation-ionization double-differential cross sections

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