Frequency metrology on the Mg3s2S1→3s4pP1 line for comparison with quasar data

Details Frequency metrology on the Mg3s2S1→3s4pP1 line for comparison with quasar data Frequency metrology on the Mg3s2S1→3s4pP1 line for comparison with quasar data

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phrva..74a2505h&link_type=abstract

Physical Review A, vol. 74, Issue 1, id. 012505

Other

17

Atomic Spectra, Laser Spectroscopy, Spectroscopic Techniques, Intergalactic Matter, Quasar Absorption And Emission-Line Systems, Lyman Forest

Scientific paper

We report a frequency metrology study on the Mg3s2S1→3s4pP1 transition near 202.5nm . For this purpose, the fourth harmonic of the output from an injection-seeded Ti:sapphire pulsed laser is employed in a Mg atomic beam experiment with laser-induced fluorescence detection. Absolute frequency calibration with a frequency comb laser is performed on the cw seeding radiation, while the chirp-induced frequency shift between the pulsed output and the seed light is monitored on line. The resulting transition frequency for the main isotope Mg24 is determined at 49346.756809(35)m-1 . This value is three orders of magnitude more precise than the best value in the literature. The line positions of the other isotopes Mg25 and Mg26 are also measured at comparable accuracy, giving rise to very exact values for the isotopic shifts. The achieved precision for the transition frequency at the 7×10-10 level makes this second resonance line of MgI an additional candidate for inclusion in many-multiplet methods, aimed at detecting a possible temporal variation of the fine-structure constant α from comparison with quasar spectra. The isotopic shifts obtained are also important to correct for possible systematic shifts due to evolution of isotopic abundances, which may mimic α -variation effects.

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