Abstract
The ionization of calcium atoms resonantly excited to the 4s4p 3P1 metastable state is investigated. In particular, the influence of various experimental parameters on the total ionization yield and the rate of its growth are reported. Maximum ionization yield was obtained with the buffer gas (Ar) pressure in the range 100-650 mbar. Furthermore, the time history of depopulation of the metastable state 4s4p 3P1 monitored in a 'pump' and 'probe' experiment using a second dye laser tuned to the 4s4p 3P1-4s5s 3S1 transition is presented. The effective lifetime of the 4s4p 3P1 state is shortened to 31+or-2 mu s at 850 degrees C and 800 mbar Ar pressure from the known value of about 350 mu s.
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