Collision-induced I(52P1/2–52P3/2) radiative transition

An investigation was made of the dependences of the initial I(5²P_1/2)→I(5²P_3/2)+hν (λ = 1315 nm) luminescence signal on the pressure and nature of the buffer gases. Atoms of I in the 5²P_1/2 state were formed, in initial concentrations of (0.5–3)×10¹⁶cm^–3, as a result of photolysis of CF₃I (0.01 atm) by the fourth harmonic of a Q-switched neodymium laser (E~0.6 J,τ ~2×10^–3 sec). The I(5²P_1/2) luminescence was recorded by a germanium photodiode whose time constant was (3–4)×10^–7 sec. When CF₃I was diluted with Ar, Xe, and SF₆ buffer gases, the intensity of the luminescence of the I(5²P_1/2) atoms increased because of an increase in the probability of the 5²P_1/2→5²P_3/2 transition as a result of collisions of the iodine atoms with the atoms or molecules of the buffer gases. The dependence of the probability of the investigated transition on the nature and pressure of the buffer gases was determined in the pressure range ~0–1 atm. Estimates were obtained of the oscillator strengths corresponding to the matrix elements of the induced electric dipole moment due to the deformation of the electron shells of the iodine atoms in collisions.