Laser induced amplified spontaneous emission (ASE) from the |$f\;0_g^ +$| (3P0) (vf = 1-7) ion-pair state of I2 was directly observed using an optical-optical double resonance technique with the B |$0_u^ +$| (vB = 21) valence state as the intermediate state. The emission detected at ∼1660 nm was assigned to transitions from the |$f\;0_g^ +$| state to the D |$0_u^ +$| (3P2) ion-pair state. The transitions observed in the dispersed IR emission spectra were found to be between vibrational levels having the same vibrational quantum numbers in both electronic states, vf = vD. This is due to the almost parallel nature of the potential energy functions of the |$f\;0_g^ +$| and D |$0_u^ +$| states, leading to almost unit values for the Franck-Condon factors for vf = vD. That the observed infrared emission is due to ASE is shown by the facts that it propagated in a limited range of solid angles, exhibited a clear threshold against the input-laser power, and had different polarization to that of laser induced fluorescence.
Laser induced amplified spontaneous emission from the |$f\;0_g^ +$| (3P) ion-pair state of I2
Shoma Hoshino, Mitsunori Araki, Hiroki Furukawa, Stephen C. Ross, Koichi Tsukiyama; Laser induced amplified spontaneous emission from the |$f\;0_g^ +$| (3P) ion-pair state of I2. J. Chem. Phys. 14 March 2013; 138 (10): 104316. https://doi.org/10.1063/1.4794159
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