Electron attachment to atomic hydrogen on the surface of liquid He4

T. Arai, Hideki Yayama, K. Kono

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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
Volume34
Issue number4
DOIs
Publication statusPublished - Jun 2 2008

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electron attachment
reaction kinetics
hydrogen
liquids
collisions
cryogenic temperature
hydrogen ions
liquid helium
electron spin
negative ions
attachment
gas mixtures
hydrogen atoms
electrons
helium
electron energy
temperature dependence
coefficients
magnetic fields
atoms

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Electron attachment to atomic hydrogen on the surface of liquid He4. / Arai, T.; Yayama, Hideki; Kono, K.

In: Low Temperature Physics, Vol. 34, No. 4, 02.06.2008, p. 397-403.

Research output: Contribution to journalArticle

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