Direct observation of collision induced transitions between the a 1Πg (v=0) and a’ 1∑−u (v=0) levels of N2 via double resonance enhanced multiphoton ionization spectroscopy

Electric-field-induced g/u mixing of the E0g+(3P2) and D0u+(3P2) ion-pair states of jet-cooled I2 observed using optical triple resonance

Electric-field-induced electronic state g/u mixing of nearly isoenergetic rovibrational levels of the E0g+(3P2) and D0u+(3P2) ion-pair states of I2 has been observed using optical triple resonance combined with resonance ionization. Detectable mixing with applied fields of 1 kV/cm occurs over a range of energy level separations of < or = 0.3 cm(-1).

STATE-RESOLVED COLLISION-INDUCED ELECTRONIC TRANSITIONS

▪ Abstract  Laser and molecular beam techniques have enabled researchers to determine the rovibrational levels populated in collision-induced electronic transitions from specified initial levels of several diatomic molecules. As exemplified by the N2+– and CN–rare-gas systems, such measurements, in combination with theoretical calculations of cross sections for these state-to-state collisional processes, provide a means to understand in detail the dynamics of these electronic quenching and energy transfer processes. The present article reviews state-to-state studies of collision-induced electronic transitions. The various collision systems studied provide examples of both perturbation-assisted “gateways” between the initial and final electronic states and perturbation-independent transitions enabled by nonadiabatic mixing induced by the collision partner.