Rotational analysis of the B-X band system of the SbO molecule
Rotational analyses of the two 0-0 bands of theB2ΣX2Πreg system of SbO were carried out for the first time from spectrograms taken in the second order of a 21 ft. concave grating spectrograph having a dispersion of 1·25 Å/mm. The rotational constants of the ν=0 vibrational levels of the upper and lower states, and of the coupling constant A0 of the lower2Πreg state were deduced. These values are summarised below. v00=25 334·93 cm−1 B′0=0·3190 cm−1 B″0=0·3490 cm−1A0=2276 cm−1 r′0=1·933 Å r″0=1·848 Å.