Precision spectroscopy of Mg atoms in a magneto-optical trap

We report the results of experimental investigations aimed at creation of the optical frequency standard based on magnesium atoms cooled and localised in a magneto-optical trap (MOT). An experimentally realised MOT for magnesium made it possible to obtain a cloud comprising atoms at a temperature of . The results of ultra-high resolution spectroscopy of intercombination transition for Mg atom are presented, the resonances in time-domain separated optical fields with the half-width of are recorded, which corresponds to the -factor of the reference line .