Phys. Rev. Lett. 71, 1690–1692 (1993)First laser excitation of the 4He 1 1S-2 1P resonance line at 58 nmReceived 15 June 1993; published in the issue dated 13 September 1993 We have observed the 1 1S-2 1P resonance line of 4He at 58.4 nm (linewidth 0.3 cm-1) in a laser-atomic-beam experiment. The coherent radiation is produced by fifth-harmonic generation of UV light from a frequency-doubled, pulsed dye laser at 584 nm in a pulsed expansion of acetylene gas. The frequency of the fundamental radiation is calibrated against the iodine absorption spectrum, resulting in a transition frequency of 171 134.89(3) cm-1. From this value a Lamb shift for the ground state of +1.38(3) cm-1 is extracted, in good agreement with the theoretical value of +1.3745 cm-1 © 1993 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.71.1690
DOI:
10.1103/PhysRevLett.71.1690
PACS:
32.30.Jc, 12.20.Fv, 42.65.Ky
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