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Basic characteristics of a free-jet supersonic expansion beam are presented along with an estimation of a number of expanding CdAr and ZnAr molecules that are excited in the free-jet in the optical–optical double resonance process. The estimation is demonstrated for laser excitation from the ground,  via  respective A 3 0 + (5 3 P 1 ) or C 1 1(4 1 P 1 ) intermediate, to the E 3 1(6 3 S 1 ) or  1 1(4 1 D 2 ) Rydberg state of CdAr or ZnAr, respectively. A number of subsequently emitted and collected photons is also predicted.

molecular physics

Optical–optical double resonance process in free-jet supersonic expansion of van der Waals molecules: characteristics of the expansion, number of excited molecules and emitted photons