[chrisso80b]

Hi Guys,
I have an exam coming up and still don't really understand how to use T-S diagrams.
I basically just had the one question.
http://en.wikipedia.org/wiki/File:D6_Tanabe-Sugano_diagram.png
Say I have a d6 metal complex, I would obviously use the d6 T-S diagram. I can work out the free ion term symbol which is ⁵D. But this is when I start having problems.
How do I find the allowed transitions that can occur?
Does an ''allowed transition'' mean the same as a ''spin allowed transition''
I have attached the T-S diagram for a d6 metal. I cant tell if the transitions are:
⁵T_2g ⁵T_2g and ⁵T_2g ⁵E_g   
or if I use the other transitions:
¹A_1g  ¹T_1g and ¹A_1g  ¹T_2g and ¹A_1g  ¹E_2g and ¹A_1g  ¹A_1g 
Which set of transitions are the correct ones?
I understand I may not have explained this well, so any questions feel free to ask?
Thanks
Chris

[vex]

I'm refreshing my memory on how to do this; the first thing you need to know, though, is whether you have a high-spin or a low-spin complex. Do you know that? Or the relative field strength? Or maybe even the ligand set? Any of those would be a good starting point.