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WHEN helium at a pressure of about 25 mm. of mercury is excited in such a way as to produce the line spectrum and the band spectrum in comparable intensity, McCallum and Wills1 find that the band ...
Feynman has recently advanced physical arguments to deduce an approximate form for the wave function of an elementary excitation in helium. Qualitatively, his theory leads to an excitation spectrum ...
Letter Published: 01 August 1938 Band Spectrum of Helium S. P. MCCALLUM & M. S. WILLS Nature 142, 252–253 (1938) Cite this article ...
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