Research & Teaching Faculty

Hot model of muonium formation in liquids

TitleHot model of muonium formation in liquids
Publication TypeJournal Article
Year of Publication2003
AuthorsWalker, DC, Karolczak, S, Gillis, HA, Porter, GB
JournalCanadian Journal of Chemistry-Revue Canadienne De Chimie
Date PublishedMar
Type of ArticleArticle
ISBN Number0008-4042
Keywordsdelayed-muonium-formation model, diamagnetic yields, FIELD, formation mechanism, GASES, hot model, muonium atoms, RESONANCE, spur model

The mechanism of formation of muonium atoms from positive muons was studied here through measurements of the yield of diamagnetic muon states in dipolar aprotic solvents and for scavenger solutions in hexane and methanol. The results are compared with published data on common solvents covering a full range of the physicochemical properties of liquids that affect an ionic formation mechanism, namely their static dielectric constants, electron mobilities, and radiolysis yields of electrons. It is concluded that muonium is not formed by a thermal charge-neutralization reaction in these chemically-active media, though that mechanism does contribute to muonium formation in inert media like liquefied noble gases. It is clear that muonium materializes on a much shorter timescale than the recently proposed "delayed" mechanism (microseconds) and the earlier "spur" model (nanoseconds). In contrast, the data referring to all these liquids are consistent with the intra-track "hot" model. This is the only Mu-formation model proposed so far in which the immediate precursors of Mu (Mu((hot))) are neither scavengable nor ionic.

URL<Go to ISI>://000182011200002