“…An "approach-induced" model was then proposed to interpret the large cross section for collision partners with permanent or transition electrostatic moments under the quasi-resonant condition, i.e., that the energy gap between the initial and final states does not exceed 25 cm −1 . Recently, Alekseev et al 18 reported evidence for amplified spontaneous emission ͑ASE͒ between the E0 g + and D0 u + states when the E0 g + state is populated by optical-optical double resonance. 16 At the same time, with an increase in the I 2 pressure, they observed the occurrence of an extraordinary strong D0 u + -X 1 ⌺ g + emission whose vibrational distribution was very different from that observed in collision-induced relaxation, but the generation mechanism of strong D0 u + -X 1 ⌺ g + emission was unsettled.…”