A STUDY OF 7667-A BAND SYSTEM OF CS2 - MAGNETIC ROTATION SPECTRA OF 7667 AND 6250-A SYSTEMS

A vibrational analysis of the 7667-Å system is reported. A detailed rotational analysis cannot be made but it is possible to find (B″ - B′) = 0.104 × 10-2 cm-1 for v″ = 0, v′ = 1, from partially resolved rotational structure. By use of both magnetic rotation and absorption data, the vibrational analysis is extended to v″ = 100, v′ = 83. For high vibrational quantum number (B″ - B′) changes sign and large displacements of the band heads from the band origins occur. With a small extrapolation it is found that De″ = 3197 ± 80 cm-1 (0.396 ± 0.010 eV) and De′ = 2139 ± 80 cm-1 (0.265 ± 0.010 eV), where De′ is the energy interval between the minimum of the potential curve and the upper bound of the region of stability of the upper state. It is found that the potential curve of the excited state has an activation lip with a height of 254 ± 45 cm-1 above the 62P 3 2 + 62S 1 2 atomic state into which the molecule dissociates. Predissociation occurs to repulsive levels that dissociate into each of the 2P 1 2 + 2S 1 2 and 2P 3 2 + 2S 1 2 atomic configurations. Previously unobserved magnetic rotation for the 6250-Å system has been observed which supports the previous analysis and is consistent with Serber's analysis of the magnetic rotation spectra of Π-Σ transitions. © 1969.