This article is cited in
5 papers
CONDENSED MATTER
Temperature dependence of the spectrum of electrons levitating above solid hydrogen
P. D. Grigor'evab,
A. M. Dyugaevab,
E. V. Lebedevac a Landau Institute of Theoretical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia
b Max-Plank-Institute for the Physics of Complex Systems, Dresden, D-01187, Germany
c Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia
Abstract:
A theory of photoresonance transitions for the electrons localized above the solid H
2 surface is proposed on the basis of the experimental data obtained by V. V. Zav’yalov and I. I. Smol’yaninov [Pis’ma Zh. Éksp. Teor. Fiz.
44, 142 (1986); Zh. Éksp. Teor. Fiz.
92, 339 (1987); Zh. Éksp. Teor. Fiz.
94, 307 (1988)] and a simple model of condensed hydrogen, H
2. A new explanation is offered for the strong dependence of the transition frequency v on the hydrogen vapor pressure revealed in the above-cited works. In contrast to the notions that were proposed by V. V. Zav’yalov and I. I. Smol’yaninov [Zh. Éksp. Teor. Fiz.
92, 339 (1987); Zh. Éksp. Teor. Fiz.
94, 307 (1988)]; and V. B. Shikin and S. N. Nazin [Pis’ma Zh. Éksp. Teor. Fiz.
82, 752 (2005)] and based on the effects of the quantum refraction of electrons by hydrogen vapor atoms, the temperature dependence of the frequency ν = ν (
T) is attributed here to the H
2 vapor inhomogeneity. The nonanalytic dependence of ν on the vapor density
n ν , ν(
n ν ) − ν(0) ~
n ν γ ~ e
−Δ/T , γ ≅ 0.56 has been revealed from the experimental data. The activation energy Δ corresponds to the “incomplete evaporation” of solid hydrogen [see J. I. Frenkel, Z. Phys.
26, 37 (1924);
Kinetic Theory of Liquids (Nauka, Leningrad, 1945; Clarendon, Oxford, 1946)]. The parameter Δ is lower than the energy of the “complete evaporation” of solid H
2 equal to 92.6 K.
PACS:
67.55.Ig
Received: 06.12.2007
Revised: 13.12.2007