A positron trap and beam apparatus for atomic and molecular scattering experiments

Sullivan, James P.; Jones, Adric; Caradonna, Peter; Makochekanwa, Casten; Buckman, Stephen

doi:10.1063/1.3030774

Cited by 88 publications

(76 citation statements)

References 17 publications

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“…This apparatus is based on a "Surko" trap and beam system 38 and has already been described in detail in Ref. 37, so that only an overview of its operation will be presented here. Positrons are obtained from a 22 Na radioactive isotope, which had an activity of approximately 40 mCi for the present measurements.…”

Section: Methodsmentioning

confidence: 99%

Total, elastic, and inelastic cross sections for positron and electron collisions with tetrahydrofuran

Chiari

Anderson

Tattersall

et al. 2013

The Journal of Chemical Physics

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We present total, elastic, and inelastic cross sections for positron and electron scattering from tetrahydrofuran (THF) in the energy range between 1 and 5000 eV. Total cross sections (TCS), positronium formation cross sections, the summed inelastic integral cross sections (ICS) for electronic excitations and direct ionization, as well as elastic differential cross sections (DCS) at selected incident energies, have been measured for positron collisions with THF. The positron beam used to carry out these experiments had an energy resolution in the range 40-100 meV (full-width at half-maximum). We also present TCS results for positron and electron scattering from THF computed within the independent atom model using the screening corrected additivity rule approach. In addition, we calculated positron-impact elastic DCS and the sum over all inelastic ICS (except rotations and vibrations). While our integral and differential positron cross sections are the first of their kind, we compare our TCS with previous literature values for this species. We also provide a comparison between positron and electron-impact cross sections, in order to uncover any differences or similarities in the scattering dynamics with these two different projectiles.

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Section: Methodsmentioning

confidence: 99%

Total, elastic, and inelastic cross sections for positron and electron collisions with tetrahydrofuran

Chiari

Anderson

Tattersall

et al. 2013

The Journal of Chemical Physics

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“…18 This apparatus is based on a positron trap and pulsed beam system, 22 and details of its operation can be found in a recent paper. 9 We simply recall here that low-energy positrons are obtained from a 22 Na radioactive source (activity of ∼40 mCi) in conjunction with a solid neon moderator.…”

Section: Methodsmentioning

confidence: 99%

“…18 We also present the first theoretical results for positron scattering from 3H-THF including the TCS, the elastic ICS, the summed inelastic ICS (excluding rotations and vibrations) and some elastic DCS calculated using the IAM-SCAR method at selected energies in the energy range from 1 to 1000 eV. We compare our measured and calculated results for 3H-THF with those from our recent investigation on THF, 9 in order to observe how small changes in the molecular structure (which may lead to quite different molecular properties) can affect the scattering process for those systems.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical cross sections for positron collisions with 3-hydroxy-tetrahydrofuran

Chiari

Palihawadana

Machacek

et al. 2013

The Journal of Chemical Physics

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Cross section results from a joint experimental and theoretical investigation into positron scattering from 3-hydroxy-tetrahydrofuran (3H-THF) are presented. Total and positronium (Ps) formation cross sections have been measured from 1 to 190 eV using the positron beamline at the Australian National University, which has an energy resolution between 60 and 100 meV. The total cross section (TCS) and the elastic and total inelastic integral cross sections in the energy range between 1 and 1000 eV have been computed within the Independent Atom Model using the Screening Corrected Additivity Rule approach. In addition, we have calculated elastic differential cross sections at selected incident energies. Our computations represent the first theoretical results reported for this target species, while our measured Ps formation cross sections are also novel. Comparison of the present TCS with the previous results from the University of Trento shows a good level of agreement at the lowest energies. We also provide a comparison between the present cross sections for 3H-THF and those from our earlier study on the parent molecule tetrahydrofuran.

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“…The experimental apparatus is based on the "Surko" trap system, developed at University of California San Diego (UCSD) [14,15], and has been comprehensively described elsewhere [16], so only a brief overview of the operation will be presented here. Positrons are obtained from a radioactive source of 22 Na that had an activity of approximately 40 mCi for the measurements presented in this paper.…”

Section: Methodsmentioning

confidence: 99%

“…The path length through the target gas was taken as the geometrical length of the scattering cell. It was experimentally established to be so by measurement of the benchmark total cross sections for He [16,19].…”

Section: A Total Cross Sectionsmentioning

confidence: 99%

Low-energy positron interactions with krypton

et al. 2011

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A positron trap and beam apparatus for atomic and molecular scattering experiments

Cited by 88 publications

References 17 publications

Total, elastic, and inelastic cross sections for positron and electron collisions with tetrahydrofuran

Total, elastic, and inelastic cross sections for positron and electron collisions with tetrahydrofuran

Experimental and theoretical cross sections for positron collisions with 3-hydroxy-tetrahydrofuran

Low-energy positron interactions with krypton

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