[Dolphinsiu]

For Strong field Oh d7 complex, tanabe Sugano diagram shows the expected spin allowed transitions are

2Eg --> 2T1g
2Eg --> 2T2g
2Eg --> 2T1g

Do my professor write them wrongly? Why 2Eg --> 2 T1g is repeated??Is there another meaning (or different ground term)? Thank you!

[Alpha-Omega]

This is a link to an interactive d⁷ Tanabe-Sugano Diagram.  It should clear up any questions/issues you are having:

http://wwwchem.uwimona.edu.jm/courses/Tanabe-Sugano/TanSugd7hs.html

This link exemplifies the use of a Tanabe-Sugano Diagram:

http://chemprof.tripod.com/tanabe.htm

This link takes you to the explanation of a d7 Tanabe Sugano Diagram for a Strong Field Ligand

http://wwwchem.uwimona.edu.jm:1104/courses/Tanabe-Sugano/TScalcs.html

[Dolphinsiu]

It seems there are only 2 spin-allowed transitions if I haven't determined wrongly! (The repeated one written by my professor is a sulphus)