Spin-polarized MS - and self-consistent charge extended Hückel calculations on as a function of the Cr - distance R have been carried out in order to clarify the origin of the bands detected in the vacuum ultraviolet excitation spectrum of associated with charge-transfer (CT) transitions as well as what electronic orbitals are involved in the jump. With the help of results on other 3d impurities it is explained that the two first transitions peaked at 8.0 and 8.7 eV are the and CT transitions while other transitions involving at least one-orbital without bonding would display a smaller oscillator strength. It is shown that the two referred transitions both exhibit a strong dependence on R ( being about ) whose microscopic origin is explained. Using this R dependence an explanation of the experimental band width W of a CT transition is attempted for the first time. The present analysis indicates that W can be understood simply considering the coupling with the mode, leading to a Huang - Rhys factor S = 20. Also it is pointed out that CT transitions involving the orbital would give rise to a significant decrement in S. The present results together with experimental data on other 3d complexes indicate that the transitions (where is and ) are probably contained in the broad third band peaked at 12 eV. Also they shed some light on the experimental results of other systems such as and which are briefly discussed.