Investigation of coherent emission in time-separated fields

An investigation was made of signals of coherent radiation generated by time-separated fields in an SF₆ gas at moments t =T+nT (n =1,2,3,4) under the action of two pulses of standing-wave CO₂ laser radiation. The amplitudes of such signals were investigated as a function of the detuning of the laser frequency relative to the center of the transition line of SF₆, as a function of the amplitude of the exciting radiation, and also as as a function of T. The rates of relaxation of the polarization, γ₁₂= (46 ± 5)×10⁶ sec^–1·Torr ^–1, and of the populations, γ = (42 ± 4)×10⁶ sec^–1·Torr ^–1, were found at pressures of 1–5 (mTorr). A comparison of γ₁₂ and γ gave information on the nature of collisions in the SF₆ gas.