THE REFRACTIVE INDICES OF LIQUID HELIUM I AND HELIUM II
- 1 July 1938
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Research
- Vol. 16a (7) , 131-132
- https://doi.org/10.1139/cjr38a-014
Abstract
The refractive indices of liquid Helium I and Helium II were measured by means of a Wollaston cell. The value obtained with λ5461 Å for He I at 4.2° K was 1.0206 ± 0.0012; for He I at 2.26° K, 1.0269 ± 0.0004; and for He II at 2.18° K, 1.0269 ± 0.0004. It was also shown that the index changed by less than ± 0.00007 in passing from a point in He I to a point with the same density in He II. It was concluded, therefore, that there is no change in the molecular refractivity in passing from He I to He II.Keywords
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