Bestimmung desg J -Faktors im 4s4p 3 P 1-Term des CaI-Spektrums mit optischer Doppelresonanz

The³ P ₁ state of Ca (τ≈0,5 msec) was populated by resonance-absorption of the intercombination line (λ=6572,8 Å). The radio-frequency-transitions between the Zeeman-sublevels of the excited state were observed by means of optical double-resonance. Because of the oscillator-strength of the intercombination line being extremely small, a second excitation method, namely with electron impact, was tried. Both methods yielded equivalent results. In order to determine theg _J -value of the³ P ₁-state the static magnetic field was calibrated by Zeeman-transitions in the ground state of Na, the transitions being detected by optical pumping,g _J was found to be 1,50105(7) in agreement with the theoretical value 1,50108.