On the basis of the approximation of harmonic oscillation between SC and S for the symmetric stretching vibration of the CS
2+ ions, the Franck-Condon factors for the
transitions of CS
+2 ions have been calculated using the potential curves and wavefunctions of the harmonic oscillator. The calculation results have been used for comparison with the photodissociation spectra
via the
transition, and for estimating the validity of the rotation constants and the bond length of
state given in the previous studies. The photodissociation mechanism
via the
transitions of CS
+2 ions has also been discussed.