1.
Phys Rev Lett
; 84(9): 1874-7, 2000 Feb 28.
Article
in English
| MEDLINE
| ID: mdl-21923212
ABSTRACT
We observe vibrational states by photoassociation spectroscopy of cold He(2 ^{3}S) atoms. Photoassociation resonances are detected as peaks in the Penning ionization rate over a frequency range of 20 GHz below the atomic 2 ^{3}S_{1}-2 ^{3}P_{2} transition frequency. We have observed three vibrational series, of which two can be identified. A possible mechanism to explain the observed increase of the Penning ionization rate is discussed.