The vibrational infrared spectrum of the group IV transition metal nitride gaseous molecules

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Abstract
The infrared spectrum of TiN, ZrN, and HfN has been observed in absorption by using a microwave discharge through MCl4/N2 mixtures as the molecular source. The molecular constants determined for each molecule are as follows: The agreement between the values of the rotational constants reported previously for TiN and ZrN establishes that each molecule has a 2Σ ground state. The appearance of the infrared spectrum indicates that HfN also has a 2Σ ground state.