The C → B(0-0) Band of Four Isotopes of Carbon Monoxide

The C 1 Σ + → B 1 Σ + ( v ′ = 0, v ″ = 0) band spectra of the four isotopes of carbon monoxide, 12 C 16 O, 13 C 16 O, 12 C 18 O, and 13 C 18 O have been recorded using a Fourier transform interferometer. The band origins of C - B (0-0) and the rotational constants B 0 and D 0 of the C (0) electronic excited state for the four isotopomers are derived.