Radiative and collisional relaxation of a single rovibrational quantum state of I 2:E(0 +g, v=8, J=56

Abstract

Dispersed fluorescence from a single quantum state in I 2 is studied. The E(0 + g), v=8, J=56 state is excited via two-colour absorption employing nanosecond lasers. Direct fluorescence in the range 390–455 nm is compared with Franck-Condon calculations for discrete transitions in the E(0 + g)-B 3Π(0 + u) system. A Franck-Condon diffraction pattern in the range 355-375 nm is attributed to the newly identified E(0 + g- 1Π(1 u) system. State-specific inelastic collision processes E(0 + g-D(0 + u) are observed and secondary fluorescence in the D(0 + u)-X(0 + g) system in the range 300–330 nm is analyzed.