High-resolution laser spectroscopy on the D1and D2lines of39,40,441K using RF modulated laser light

Two natural polyisotopic potassium beams were illuminated respectively by a RF modulated and an unmodulated laser beam. The laser side band frequency is locked on an atomic frequency, while the unmodulated laser frequency is RF scanned. The RF accuracy of the frequency scale allows measurements to about 0.3 MHz of the hyperfine structures and the isotope shifts of the D 1 and D 2 lines of 39,40,41 K. The results obtained are reported and compared to the previous ones.