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

Abstract

An investigation was made of the dependences of the initial I(52P1/2)→I(52P3/2)+hν (λ = 1315nm) luminescence signal on the pressure and nature of the buffer gases. Atoms of I in the 52P1/2 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(52P1/2) 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(52P1/2) atoms increased because of an increase in the probability of the 52P1/2→52P3/2 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.