Ionic currents modulated by film flow in superfluid helium. Bianconi, A. & Maraviglia, B. Journal of Low Temperature Physics, 1(3):201–213, 1969.
Ionic currents modulated by film flow in superfluid helium [link]Paper  doi  abstract   bibtex   
The oscillations of two helium baths coupled by the saturated film have been studied with a new method employing positive ions. The sensitivity of such a method for the variation of liquid-level height is found to be of the order of 10-6 cm. The film current was observed to be modulated with a frequency double that of the level oscillations. This interesting new feature is discussed in the framework of the present theory of liquid helium.
@article{bianconi_ionic_1969,
	title = {Ionic currents modulated by film flow in superfluid helium},
	volume = {1},
	issn = {0022-2291},
	url = {http://dx.doi.org/10.1007/bf00628408},
	doi = {10.1007/bf00628408},
	abstract = {The oscillations of two helium baths coupled by the saturated film have been studied with a new method employing positive ions. The sensitivity of such a method for the variation of liquid-level height is found to be of the order of 10-6 cm. The film current was observed to be modulated with a frequency double that of the level oscillations. This interesting new feature is discussed in the framework of the present theory of liquid helium.},
	number = {3},
	journal = {Journal of Low Temperature Physics},
	author = {Bianconi, A. and Maraviglia, B.},
	year = {1969},
	keywords = {film, he, liquid, superfluid, vortex},
	pages = {201--213}
}

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