A critical review of the available spectroscopic information about diatomic indium halides has been performed. The literature was surveyed till early 2002 and the data on the molecular constants for the ground state, as well as excited states of these molecules has been presented. A brief discussion on the dissociation energies, ionization potentials, and the nature of the bonding in the ground state is given. The energy level diagram and Rydberg–Klein–Rees potential curves for the different electronic states of these molecules are also presented. Mechanism of laser emission/fluorescence due to atomic indium in the ultraviolet photodissociation of indium monohalides has also been discussed.

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