In this paper, we describe amplified spontaneous emission (ASE) from the f′ 0g + (1D2) ion-pair state of I2 populated through a two-step laser excitation technique via the B 3 (0u+) valence state. The intense infrared emission propagating in the direction of the incident laser beam is assigned to the ASE transition from the f′ 0g + (1D2) state to the F′ 0u+ (1D2) ion-pair state. The subsequent ultraviolet fluorescence transition from the F′ 0u+ (1D2) state to the 0g + (bb) state as well as the 0g + (ab) state is also reported. By Franck-Condon simulation of the cascading F′ 0u+ (1D2) → 0g + (bb) band, we determine the population distributions in the F′ 0u+ (1D2) state generated by ASE, which are consistent with the intensity profile of the mid-infrared ASE spectrum. Finally, employing these vibrational distributions for the F′ 0u+ (1D2) state, spectral parameters for the shallow 0g + (ab) state are derived.