@inproceedings{947e7572461644fb8c69735520c04d9d,
title = "Positive ion extraction across the superfluid-vapor helium interface",
abstract = "The extraction efficiency of positive (219)Rn ions across the superfluid-vapor helium interface above similar to 1.3 K indicates that extraction results from thermal activation across a barrier of about 20 K. Below similar to 1.3 K, the extraction efficiency is constant at about 0.7%. The evaporation of the superfluid surface by second sound pulses has a negative impact on the ion extraction, but not on the ions themselves. It takes 3.2( 6) s at 1.60 K and 15( 6) s at 1.15 K for the extraction process to recover from a disturbed state of yet unknown nature.",
author = "S. Purushothaman and K. Perajarvi and M. Ranjan and A. Saastamoinen and K. Gloos and N. Takahashi and P. Dendooven",
year = "2009",
doi = "10.1088/1742-6596/150/3/032086",
language = "English",
series = "Journal of Physics Conference Series",
publisher = "IoP Publishing",
editor = "P Kes and R Jochemsen",
booktitle = "Journal of Physics: Conference Series 150, 032086 (2009)",
note = "25th International Conference on Low Temperature Physics (LT25) ; Conference date: 06-08-2008 Through 13-08-2008",
}