Formation of negative hydrogen ions in 7-keV OH++Ar and OH++acetone collisions: A general process for H-bearing molecular species

Juhász, Zoltán and Sulik, Béla and Rangama, Jimmy and Bene, Erika and Sorgunlu-Frankland, Burcu and Frémont, Franc¸ois and Chesnel, Jean-Yves (2013) Formation of negative hydrogen ions in 7-keV OH++Ar and OH++acetone collisions: A general process for H-bearing molecular species. Physical Review A, 87 (3). pp. 1-9. ISSN 1050-2947

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Abstract

We demonstrate that the formation of negative hydrogen ions (H−) occurs in a wide class of atomic and molecular collisions. In our experiments,H− emission from hydroxyl cations and acetone molecules was observed in keV-energy collisions. We show that hydride (H−) anions are formed via direct collisional fragmentation of molecules, followed by electron grabbing by fast hydrogen fragments. Such general mechanism in hydrogen-containing molecules may significantly influence reaction networks in planetary atmospheres and astrophysical media and new reaction pathways may have to be added in radiolysis studies.

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