期刊
MOLECULES
卷 26, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/molecules26123663
关键词
Miller-Urey experiment; prebiotic chemistry; plasma kinetics; electrons prebiotic molecules
The modeling of plasmas or ionized gases with compositions compatible with primordial atmospheres has seen recent progress. Plasma kinetics involve processes where free electrons activate weakly reactive molecules and exchange energy between molecules. Concepts such as the electron velocity distribution function and the vibrational distribution function can provide insights into prebiotic processes initiated by electron-molecule collisions.
We review the recent progress in the modeling of plasmas or ionized gases, with compositions compatible with that of primordial atmospheres. The plasma kinetics involves elementary processes by which free electrons ultimately activate weakly reactive molecules, such as carbon dioxide or methane, thereby potentially starting prebiotic reaction chains. These processes include electron-molecule reactions and energy exchanges between molecules. They are basic processes, for example, in the famous Miller-Urey experiment, and become relevant in any prebiotic scenario where the primordial atmosphere is significantly ionized by electrical activity, photoionization or meteor phenomena. The kinetics of plasma displays remarkable complexity due to the non-equilibrium features of the energy distributions involved. In particular, we argue that two concepts developed by the plasma modeling community, the electron velocity distribution function and the vibrational distribution function, may unlock much new information and provide insight into prebiotic processes initiated by electron-molecule collisions.
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