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Abstract
Positron cooling in CF4 and N2 gases via inelastic vibrational and rotational (de)excitations is simulated, importantly including elastic positron-positron collisions. For CF4, it is shown that rotational (de)excitations play no role on the experimental timescale, and further, that in the absence of positron-positron collisions, cooling via excitation of the dipole-active ν3 and ν4 modes alone would lead to a non-Maxwellian positron momentum distribution, in contrast to the observations of experiment. It is shown that the observed Maxwellianization of the distribution may be effected by positron-positron collisions and/or cooling involving the combination of the dipole-inactive ν1 mode with the dipole-active modes. For N2, rotational excitations alone are sufficient to Maxwellianize the distribution (vibrational effects are negligible).
Original language | English |
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Article number | 033001 |
Number of pages | 6 |
Journal | Physical Review Letters |
Volume | 130 |
Issue number | 3 |
DOIs | |
Publication status | Published - 19 Jan 2023 |
Keywords
- Positron
- cooling
- collisions
- atomic
- molecular
- maxwellianization
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Dive into the research topics of 'Maxwellianization of positrons cooling in CF4 and N2 gases'. Together they form a unique fingerprint.Projects
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R6997TCP: Many-body Theory of Antimatter Interactions with Atoms, Molecules and Condensed Matter
29/10/2018 → …
Project: Research
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Positron cooling in CF4 and N2 gas: videos
Green, D. (Creator) & Swann, A. (Owner), Queen's University Belfast, 29 Jan 2021
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