Ashley, P;
Moxom, J;
Laricchia, G;
(1996)
Near-threshold ionization of He and H-2 by positron impact.
Physical Review Letters
, 77
(7)
1250 - 1253.
10.1103/PhysRevLett.77.1250.
![[thumbnail of 1339278.pdf]](https://discovery.ucl.ac.uk/style/images/fileicons/application_pdf.png) Preview |
PDF
1339278.pdf Available under License : See the attached licence file. Download (141kB) |
Abstract
The single ionization cross sections for He and H-2 by positron impact have been measured in the first few eV above threshold and found to exhibit a different energy dependence from the corresponding electron results. If the data, between 1 and 3 eV above threshold, are fitted by a power law, exponents of 1.99 +/- 0.19 and 1.70 +/- 0.11 are obtained for He and H-2, respectively. This agrees qualitatively with extensions of the Wannier theory in that the exponent is larger than for electron impact. The quantitative disagreement with the predicted value of 2.65 might indicate that the range of validity of this theory is smaller than expected.
| Type: | Article |
|---|---|
| Title: | Near-threshold ionization of He and H-2 by positron impact |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.77.1250 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.77.1250 |
| Language: | English |
| Additional information: | © 1996 The American Physical Society |
| Keywords: | ELECTRON-ATOM IONIZATION, SINGLE IONIZATION, CROSS-SECTIONS, LAW, AR, HYDROGEN, HELIUM, FRAGMENTATION, BEHAVIOR |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1339278 |
Archive Staff Only
 |
View Item |
