Gaseous Reactions involving Positronium

Massey, H. S. W.; Mohr, C. B. O.

doi:10.1088/0370-1298/67/8/306

Cited by 163 publications

(80 citation statements)

References 5 publications

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“…These values are in agreement with the theoretical value of 12 cm 2/volt-sec obtained using a quantum mechanical evaluation of the interaction between atomic helium ions and neutral helium atoms (3). This agreement provides further indirect evidence in favor of the proposal (4) that the molecular helium ion was responsible for the large mobility value of 22 cm2/volt-sec obtained from previous measurements (5) of the drift velocity of helium ions.…”

Section: Introductionsupporting

confidence: 90%

Positive Ions in the Afterglow of a Low Pressure Helium Discharge

1952

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Section: Introductionsupporting

confidence: 90%

Positive Ions in the Afterglow of a Low Pressure Helium Discharge

1952

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“…The triple differential cross-section (TDCS) in electron hydrogen atom ionization collision has become increasingly interesting over the last four to five decades both theoretically and experimentally for relativistic [2]- [9] as well as for non-relativistic energies [10]- [21]. Triple differential cross-section (TDCS), measured in (e, 2e) coincidence experiment investigated first by Ehrhardt et al [22] and Amaldi et al [23].…”

Section: Introductionmentioning

confidence: 99%

The Triple Differential Cross Sections for Electron Impact Ionization of Metastable 3s State Hydrogen Atoms with Exchange Effect

Noor¹,

Dhar²

2017

OJM

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A final state wave function of multiple scattering theory developed by Das and seal is utilized in the present study to calculate the triple differential cross sections (TDCS) for the ionization of metastable 3S state hydrogen atoms at incident electron energy of 250 eV with the exchange effects in the asymmetric coplanar geometry for various kinematic conditions. Our present calculation results are compared with the available hydrogenic ground state experimental data and other existing theoretical results. A good qualitative agreement is shown with those of compared results of the present study specifically with hydrogenic ground state experimental data and metastable 2S and 2P state with exchange effect results. These new results offer an extensive scope for experimental verification in such ionization process.

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“…p-Ps mixing caused by the spin-orbit interaction has also been invoked to explain anomalies in the magnetic field dependence of the positron lifetime spectrum for mylar [4]. The possibility of spin-orbit quenching in Ps-atom (molecule) collisions has been largely ignored since early estimates deemed the effect to be very small [5,6].…”

mentioning

confidence: 99%

Spin-Orbit Quenching of Positronium during Atomic Collisions

Mitroy

Novikov

2003

Phys. Rev. Lett.

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When positrons are injected into a gas, 75% of the positronium (Ps) is likely to be formed as longlived ortho-Ps. The main decay mechanisms for the ortho-Ps have been assumed to be natural decay of ortho-Ps and pickoff annihilation of the positron during Ps-atom collisions. A third possibility for annihilation is ortho-Ps ! para-Ps conversion due to the spin-orbit interaction between the atom and colliding Ps. This extra quenching mechanism may explain a number of phenomena observed in the annihilation spectrum of Kr and Xe, including the very small Ps fraction of 3% seen for Xe.

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Gaseous Reactions involving Positronium

Cited by 163 publications

References 5 publications

Positive Ions in the Afterglow of a Low Pressure Helium Discharge

Positive Ions in the Afterglow of a Low Pressure Helium Discharge

The Triple Differential Cross Sections for Electron Impact Ionization of Metastable 3s State Hydrogen Atoms with Exchange Effect

Spin-Orbit Quenching of Positronium during Atomic Collisions

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