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

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.

References in corpus (2)

• Cosmological Implications of the Uncertainty in H- Destruction Rate Coefficients
• Detection of OH${}^{+}$ and H${}_2$O${}^{+}$ towards Orion~KL

Cited by in corpus (4)

• Formation of anions and cations via a binary-encounter process in OH${}^{+}$ + Ar collisions: the role of dissociative excitation and statistical aspects
• Anion emission from water molecules colliding with positive ions: Identification of binary and many-body processes
• Thermodynamic model for electron emission and negative- and positive-ion formation in keV molecular collisions
• Anion and cation emission from water molecules after collisions with 6.6-keV ${}^{16}$O${}^{+}$ ions