We have studied the time-resolved spectra, the energy-resolved spectra, and the total intensity of light emission induced by near-resonance two-photon excitation to the 4²D3/2 and 4²D5/2 levels of Na over the detuning range -7 cm^-1<~Δ<~7 cm^-1. The time-resolved spectra of Na perturbed by Ar exhibit a fast adiabatic component and a slow resonance-fluorescence component. The cross section for phase-shifting, T₂-type collisions in this atomic system is σ=110±20 ².
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Liran et al. (1977) studied this question.
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