IMPROVED RADIATIVE LIFETIMES OF HE-I 3S-3(1) AND 3D-3(J) BY BEAM-GAS-DYE-LASER SPECTROSCOPY

Citation
U. Volz et al., IMPROVED RADIATIVE LIFETIMES OF HE-I 3S-3(1) AND 3D-3(J) BY BEAM-GAS-DYE-LASER SPECTROSCOPY, Journal of physics. B, Atomic molecular and optical physics, 28(4), 1995, pp. 579-589
Citations number
18
Categorie Soggetti
Physics, Atomic, Molecular & Chemical",Optics
ISSN journal
09534075
Volume
28
Issue
4
Year of publication
1995
Pages
579 - 589
Database
ISI
SICI code
0953-4075(1995)28:4<579:IRLOH3>2.0.ZU;2-X
Abstract
The lifetimes of the 3(3)S(1) and 3(3)D(J) levels of the helium atom w ere determined at improved precision by means of the cascade-free beam -gas-dye-laser spectroscopy method. The influence of the divergence of the helium-atom beam on the lifetime measurement was investigated in detail and led to some substantial corrections. The resulting lifetime s (including a correction for beam divergence) are 35.94 +/- 0.20 ns a nd 14.12 +/- 0.06 ns, respectively, where the uncertainties quoted cor respond to one standard deviation. The results are discussed in compar ison with other experimental and theoretical work. The agreement betwe en the present experiment and the results of the most refined theoreti cal calculations is found to be excellent.