Saturation of the Ca intercombination line and its application to spectroscopy and frequency standards
Experiments were carried out using a Ca atomic beam and a tunable dye laser. Lamb dips were obtained in the fluorescence line of various Ca isotopes. It is shown that the narrow signals associated with saturation of the 4s2 1S0–4s4p 3P1, intercombination transition are potentially useful for frequency standards and highresolution spectroscopy. Measurements were made of the nuclear charge radii of six stable Ca isotopes. Radiofrequency transitions between excited state sublevels were studied. The nuclear quadrupole moment of the rarely encountered isotope 43Ca was determined.