Luminescence spectrum in far wings of the resonance line of cesium atoms approaching a sapphire surface

The shape of the luminescence spectrum of Cs atoms flying near a sapphire surface is described phenomenologically for the detuning from the D2 line ranging within 5–50 cm^?1. The numerical fitting of one theoretical parameter and a small variation of another parameter ensures a satisfactory agreement with the experimental spectrum. The experimentally determined abnormally high intensity of the antistatic wing is explained by the effect of phase relaxation of the atomic transition, caused by fluctuations of the electric field of oscillating ions of the sapphire crystal lattice.