Continuous-wave Doppler-free two-photon spectroscopy of the 4d(10)5s S-2(1/2)-> 4d(9)5s(2) D-2(3/2) transition in atomic silver

摘要

The frequencies of the hyperfine components of the transition 4d(10) 5s S-2(1/2) --> 4d(9) 5s(2) D-2(3/2) in Ag-107 and Ag-109 have been determined using Doppler- free two- photon laser spectroscopy of a thermal atomic beam and heterodyne calibration with respect to a molecular iodine line 111R(18-1) near 520 THz. For the centre of gravity of a mixture of natural abundance, we deduce the value 1 040 706 327( 3) MHz. For the isotope shift, we obtain nu(Ag-109) - nu(Ag-107) = + 599.6(2) MHz. We find the magnetic hyperfine splitting constants of the excited state to be A(Ag-107 (D-2(3/2))) = - 315.9(2) MHz and A(Ag-109 (D-2(3/2))) = - 363.3(2) MHz, an order of magnitude improvement over previous authors [ W. Fischer et al., Z. Phys. 238, 249 ( 1970)].