Accurate Wavelength Measurement of the $1 s 2 p {}^{3}P^{\circ} - 2 p^{2} {}^{3}P$ Transition in ${}^{4}{He}$ I

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16 August 1971

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

Vol. 27 (7) , 367-370
https://doi.org/10.1103/physrevlett.27.367

Abstract

An accurate spectroscopic measurement has yielded 320.2926 ± 0.0010 Å for the wavelength of the

1 s 2 p {}^{3}P^{\circ} - 2 p^{2} {}^{3}P

transition in

{}^{4}{He}

I. Combining this wavelength with the well-known position of the

1 s 2 p

term gives an experimental value of 481 301.5 ± 1.2

{cm}^{- 1}

for the position of the doubly excited

2 p^{2} {}^{3}P

term relative to the ground

1 s^{2} {}^{1}S

. The new measurement is in excellent agreement with Aashamar's theoretical calculation of 481 301.6

{cm}^{- 1}

for the energy of the term.

Keywords

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