Diode laser spectroscopy of C3: The ν2+ν3−ν2, 2ν2+ν3− 2ν2, and 2ν2+ν3 bands

The ν3 hot bands (011)–(010), (021)–(020), and the combination band (021)–(000) of C3 were observed by a diode laser spectroscopic method. The C3 molecule was produced by the photolysis of allene or by the discharge in cyclopropane or furan. Analysis gave molecular constants in each vibrational state and also the energy difference between (020) and (000). The derived vibrational frequencies were compared with the result of a Morse oscillator‐rigid bender internal dynamics (MORBID) calculation by Jensen.