First observation of the 4d10 5s 2S{1/2} #x2192; 4d2 5s2 2D{3/2} transition by Doppler-free two-photon spectroscopy in a silver atomic beam

摘要

We have measured the frequencies of the hyperfine components of the transition 4d10 5s 2S1/2 → 4d9 5s2 2D3/2 in 107Ag and 109Ag, by Doppler-free two-photon laser spectroscopy of a thermal atomic beam and heterodyne calibration with respect to a molecular iodine line near 520THz. We deduce the value of 1 040 706 327 (3) MHz for the centre of gravity of a mixture of natural abundance. For the isotope shift, we obtain v109Ag)-v(107Ag)=+599.6 (2) MHz. We find the magnetic hyperfine splitting constants of the excited state to be A(107Ag(2D3/2))=−315.9 (1) MHz and A(109Ag(2D3/2)=−363.3 (1) MHz, an order of magnitude improvement over previous authors.