Spectroscopic Study of Liquid Helium in the Vacuum Ultraviolet

13 October 1969

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 23 (15), 842-846
https://doi.org/10.1103/PhysRevLett.23.842

Abstract

The absolute reflectance of liquid helium was measured as a function of wavelength between 1000 and 518 Å. The main feature of the data is a large peak in reflectance located at 574 Å and having a width (at half-maximum) of 15.5 Å. The absolute reflectance at the maximum is 0.12±0.01. The peak appears to correspond to the

1 {}^{1}S_{0} \to 2 {}^{1}P_{1}

atomic transition. Very small structure near 597 Å may correspond to a forbidden atomic transition.

Keywords

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