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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).
|Number of pages||6|
|Journal||Physical Review Letters|
|Publication status||Published - 19 Jan 2023|
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R6997TCP: Many-body Theory of Antimatter Interactions with Atoms, Molecules and Condensed Matter
29/10/2018 → …
Positron cooling in CF4 and N2 gas: videos
Green, D. (Creator) & Swann, A. (Owner), Queen's University Belfast, 29 Jan 2021