Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2000-10-07
Phys. Rev. Lett. 86, 3356 (2001)
Physics
Condensed Matter
Statistical Mechanics
4 pages, 4 figures, all zipped in a sigle file. Submitted to Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.86.3356
We present the first systematic measurement of the binding energy $E_a$ of hydrogen atoms to the surface of saturated $^3$He-$^4$He mixture films. $E_a$ is found to decrease almost linearly from 1.14(1) K down to 0.39(1) K, when the population of the ground surface state of $^3$He grows from zero to $6\times10^{14}$ cm$^{-2}$, yielding the value $1.2(1)\times 10^{-15}$ K cm$^2$ for the mean-field parameter of H-$^3$He interaction in 2D. The experiments were carried out with overall $^3$He concentrations ranging from 0.1 ppm to 5 % as well as with commercial and isotopically purified $^4$He at temperatures 70...400 mK. Measuring by ESR the rate constants $K_{aa}$ and $K_{ab}$ for second-order recombination of hydrogen atoms in hyperfine states $a$ and $b$ we find the ratio $K_{ab}/K_{aa}$ to be independent of the $^3$He content and to grow with temperature.
Boldarev S. T.
Jaakkola Salla
Kharitonov A. A.
Lukashevich I. I.
Safonov A. I.
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