We can estimate the value of Δ and B from Tanabe Sugano diagram. For example Ni2+ which is has the electronic configuration of d8. So, by referring the d8 Tanabe Sugano diagram, we can can noticed that there are 3 types of transition. The transitions are observed as V1=8500cm-1, V2=13800cm-1 and v3=25300cm-1. We can take the ratio V2/V1=1.624. But the problem is, from the ratio ,how can we determine value of the vertical axis, that is Δ /B? Due to this problem, I find the difficulty to estimate the value of Δ and B. In addition, how can we explain the further splitting of the spectrum? Thanks.