Electron attachment to atomic hydrogen on the surface of liquid He4

T. Arai, H. Yayama, K. Kono

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We demonstrate a possibility that helium surface electrons at cryogenic temperatures can be used as a new source of very low energy electrons. Since both electrons (e-) and hydrogen atoms (H) are bound on liquid helium surface, two-dimensional mixture gas of these two species is available on the surface. We found that low energy collision of e- and H drives electron attachment to form a negative hydrogen ion (H-) in the mixture. From our temperature dependence measurement of the reaction rate, it was found that another H atom participate in the reaction. Namely, the reaction is expressed as H+H+ e- → H- +H. Possible reaction mechanisms are discussed in terms of direct three-body process and dissociative attachment process. Measurements in applied magnetic field (B) show that the reaction rate coefficient is suppressed as ∼ B-2. This implies that electron spin singlet collision is relevant for electron attachment.

Original languageEnglish
Pages (from-to)397-403
Number of pages7
JournalLow Temperature Physics
Issue number4
Publication statusPublished - 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'Electron attachment to atomic hydrogen on the surface of liquid He4'. Together they form a unique fingerprint.

Cite this