Physics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrva..71d0501l&link_type=abstract
Physical Review A, vol. 71, Issue 4, id. 040501
Physics
9
Properties Of Atoms, Vacuum Ultraviolet Spectra, Quasars
Scientific paper
With the use of an ultra-narrow-band extreme ultraviolet laser source, tunable near 94 nm, transition wavelengths are determined for lines connecting the 1s22s22p2 P0,1,23 ground-term levels to the 1s22s2p3 S13 excited level in neutral carbon at an absolute accuracy of 4×10-8 . With the determination of the zero-velocity rest-frame wavelengths these lines can be included in an analysis of a possible temporal variation of the fine-structure constant α from a comparison with quasar data. A value for the C12 / C13 transition isotope shift was also obtained yielding 0.5107(13)cm-1 , in average over the three fine-structure lines. The latter measurement will allow to study isotopic evolution in the universe and test models of nuclear processes in stars.
Flambaum Victor V.
Labazan Irena
Reinhold Elmar
Ubachs Wim
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