Recombination of spin polarized atomic hydrogen adsorbed on a dilute super(3)He- super(4)He mixture

• Published in: Journal of low temperature physics Vol. 121; no. 5-6; pp. 737 - 742
• Main Authors: Fukuda, Akira, Takenaka, Hirokazu, Mizusaki, Takao
• Format: Journal Article
• Language: English
• Published: 01.12.2000
• ISSN: 0022-2291

We have been searching for two-dimensional (2-D) superfluidity of spin-polarized atomic hydrogen (H arrow down ) adsorbed on liquid helium surface. We have investigated H arrow down adsorbed on super(3)He- super(4)He mixtures instead of pure super(4)He because the thermal coupling of H arrow down to the mixtures is stronger than super(4)He. ESR at 129 GHz was carried out to detect H arrow down at 4.5 T by using the Fabri-Perot confocal cavity with the cold spot located at the confocal point and thus the 2-D H arrow down signal was effectively detected. We investigated the two-body bulk and surface recombination processes of H arrow down on a 3% super(3)He super(3)He- super(4)He mixture film. From the analysis of the surface recombination process, we found the adsorption energy of H arrow down was a 0.6 K for the mixture film in the temperature range between 120 mK and 250 mK, greater than the 0.3-0.4 K found previously for pure super(3)He and a 67% super(3)He super(3)He- super(4)He mixture.