Resonant scattering of positronium as a quasifree electron

Shipman, M.; Brawley, S. J.; Sarkadi, L.; Laricchia, G.

doi:10.1103/physreva.95.032704

Cited by 13 publications

(18 citation statements)

References 48 publications

(83 reference statements)

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“…A recent experimental paper [4] confirmed earlier predictions [3] of the resonant Ps−N 2 scattering and extended previous measurements towards the challenging region of low Ps energies. In interpreting their results, the authors [4] assumed that the electron, on the average, is closer to the target than the positron [20], and averaged the electron scattering cross section for N 2 over the momentum distribution of electron in Ps. The result of this convolution exhibits a resonance peak which is somewhat too broad as compared to the experimental data.…”

Section: Introductionsupporting

confidence: 82%

“…In Fig. 6 we present our theoretical elastic, ionization and total cross sections, and compare the latter with the experimental data [1,4]. The theoretical resonance peak's position (v = 0.34 a.u.)…”

Section: Resultsmentioning

confidence: 84%

“…and a peak in the Π u partial cross section which is mainly responsible for the maximum in the total cross section at v = 0.44 a.u. We should note though that the actual dependence of the cross section on Ps energy should be more complicated, since inclusion of vibrational motion of the target will create additional structure in the cross section (boomerang oscillations [13]) which is not resolved yet in measurements [1,4]. These differences from e − -N 2 scattering can be understood by looking at the spherically symmetric (λ=0) components of the potential and considering some of dominant potential matrix elements V M LL ′ .…”

Section: Resultsmentioning

confidence: 99%

“…The observed similarity between electron and Ps scattering by neutral targets [1][2][3] was recently extended to resonant scattering in Ps-N 2 [3,4] and Ps-CO 2 [2] collisions. In particular the very well-known resonance in e−N 2 scattering of the Π g symmetry [5] looks very similar to the observed resonance in the Ps-N 2 scattering if cross sections for both processes are plotted as functions of the projectile velocity.…”

Section: Introductionmentioning

confidence: 89%

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Positronium collisions with molecular nitrogen

Wilde

Fabrikant

2018

Phys. Rev. A

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For many atomic and molecular targets positronium (Ps) scattering looks very similar to electron scattering if total scattering cross sections are plotted as functions of the projectile velocity. Recently this similarity was observed for the resonant scattering by the N 2 molecule. For correct treatment of Ps-molecule scattering incorporation of the exchange interaction and short-range correlations is of paramount importance. In the present work we have used a free-electron-gas model to describe these interactions in collisions of Ps with the N 2 molecule. The results agree reasonably well with the experiment, but the position of the resonance is somewhat shifted towards lower energies, probably due to the fixed-nuclei approximation employed in the calculations. The partial-wave analysis of the resonant peak shows that its composition is more complex than in the case of e−N 2 scattering.

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Section: Introductionsupporting

confidence: 82%

Section: Resultsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 89%

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Positronium collisions with molecular nitrogen

Wilde

Fabrikant

2018

Phys. Rev. A

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“…In some of these experiments Ps beam energies comparable to or higher than the Ps binding energy (6.8 eV) are used, allowing the interactions to be reasonably well characterized by the impulse approximation [642,643]. For lower Ps beam energies [232] this approximation will not be valid and other effects must be taken into account [644]. It may be informative to perform similar measurements using Rydberg Ps atoms to verify the theory, and also to use atoms in different Stark-states at lower energies.…”

Section: Scatteringmentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

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Abstract. The field of experimental positronium physics has advanced significantly in the last few decades, with new areas of research driven by the development of techniques for trapping and manipulating positrons using Surko-type buffer gas traps. Large numbers of positrons (typically ≥10 6 ) accumulated in such a device may be ejected all at once, so as to generate an intense pulse. Standard bunching techniques can produce pulses with ns (mm) temporal (spatial) beam profiles. These pulses can be converted into a dilute Ps gas in vacuum with densities on the order of 10 7 cm −3 which can be probed by standard ns pulsed laser systems. This allows for the efficient production of excited Ps states, including long-lived Rydberg states, which in turn facilitates numerous experimental programs, such as precision optical and microwave spectroscopy of Ps, the application of Stark deceleration methods to guide, decelerate and focus Rydberg Ps beams, and studies of the interactions of such beams with other atomic and molecular species. These methods are also applicable to antihydrogen production and spectroscopic studies of energy levels and resonances in positronium ions and molecules. A summary of recent progress in this area will be given, with the objective of providing an overview of the field as it currently exists, and a brief discussion of some future directions.

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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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Resonant scattering of positronium as a quasifree electron

Cited by 13 publications

References 48 publications

Positronium collisions with molecular nitrogen

Positronium collisions with molecular nitrogen

Experimental progress in positronium laser physics

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

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