Isotopic shift, pressure shift, and pressure broadening of the7d′states of neon using Doppler-free two-photon absorption spectroscopy

Doppler-free two-photon transitions between the $3s$, $J=2\mathrm{}$ metastable state and the subconfiguration $7d^{\prime }$ of neon are studied with a pulsed-dye-laser oscillator-amplifier system which was synchronized with a chopped rf discharge in neon vapor. The isotopic shifts for these transitions are measured, and based on these measurements we have made a systematic study of Ne-Ne and Ne-He collisional broadening and shift of these very narrow Doppler-free two-photon resonances.