Strong suppression of the positronium channel in double                ionization of noble gases by positron impact

H. Bluhme; H. Knudsen; J.P. Merrison; Mogens Rysholt Poulsen

doi:10.1103/PhysRevLett.81.73

Strong suppression of the positronium channel in double ionization of noble gases by positron impact

H. Bluhme, H. Knudsen, J.P. Merrison, Mogens Rysholt Poulsen

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

Positron-induced double ionization of helium and neon has been studied at energies from threshold to 900 eV. A remarkable difference between the near-threshold behavior of the single and double ionization cross sections is found: Single ionization is dominated by positronium (Ps) formation, while for double ionization the Ps channel is absent or strongly suppressed. Absolute cross sections for the two targets have been derived and are compared to a modified Rost-Pattard parametrization. Good agreement is found, showing that this type of model can be extended from single to double ionization.

Original language	English
Journal	Physical Review Letters
Volume	81
Issue number	1
Pages (from-to)	73-77
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.81.73
Publication status	Published - 1998

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10.1103/PhysRevLett.81.73

Cite this

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title = "Strong suppression of the positronium channel in double ionization of noble gases by positron impact",

abstract = "Positron-induced double ionization of helium and neon has been studied at energies from threshold to 900 eV. A remarkable difference between the near-threshold behavior of the single and double ionization cross sections is found: Single ionization is dominated by positronium (Ps) formation, while for double ionization the Ps channel is absent or strongly suppressed. Absolute cross sections for the two targets have been derived and are compared to a modified Rost-Pattard parametrization. Good agreement is found, showing that this type of model can be extended from single to double ionization.",

author = "H. Bluhme and H. Knudsen and J.P. Merrison and Poulsen, {Mogens Rysholt}",

year = "1998",

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language = "English",

volume = "81",

pages = "73--77",

journal = "Physical Review Letters",

issn = "0031-9007",

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T1 - Strong suppression of the positronium channel in double ionization of noble gases by positron impact

AU - Bluhme, H.

AU - Knudsen, H.

AU - Merrison, J.P.

AU - Poulsen, Mogens Rysholt

PY - 1998

Y1 - 1998

N2 - Positron-induced double ionization of helium and neon has been studied at energies from threshold to 900 eV. A remarkable difference between the near-threshold behavior of the single and double ionization cross sections is found: Single ionization is dominated by positronium (Ps) formation, while for double ionization the Ps channel is absent or strongly suppressed. Absolute cross sections for the two targets have been derived and are compared to a modified Rost-Pattard parametrization. Good agreement is found, showing that this type of model can be extended from single to double ionization.

AB - Positron-induced double ionization of helium and neon has been studied at energies from threshold to 900 eV. A remarkable difference between the near-threshold behavior of the single and double ionization cross sections is found: Single ionization is dominated by positronium (Ps) formation, while for double ionization the Ps channel is absent or strongly suppressed. Absolute cross sections for the two targets have been derived and are compared to a modified Rost-Pattard parametrization. Good agreement is found, showing that this type of model can be extended from single to double ionization.

U2 - 10.1103/PhysRevLett.81.73

DO - 10.1103/PhysRevLett.81.73

M3 - Journal article

VL - 81

SP - 73

EP - 77

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 1

ER -