d7 Tanabe-Sugano diagram
A Tanabe-Sugano diagram of the spin-allowed and low-lying spin-forbidden transitions for high spin octahedral d7 and tetrahedral d3 complexes is given below.
<img src="tsd7.jpg">

Select the region of interest then click on the curve to get values. See the instructions for more information.

For the high spin d7 case, the ground term is 4T1g which is plotted along the X-axis. The first spin-allowed transition is to the 4T2g level which is the red line. The other spin-allowed transitions are to the 4A2g level (drawn in green) and the 4T1g(P) level (drawn in blue).

The low-energy spin-forbidden transitions arising from the 2G term are shown as well.

For the tetrahedral d3 case, the transitions are expected at somewhat smaller values of D/B since Dtet ~ 4/9 Doct. (The subscript g's should be dropped as well.)
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Copyright © 2003 by Robert John Lancashire, all rights reserved.

Created and maintained by Prof. Robert J. Lancashire,
The Department of Chemistry, University of the West Indies,
Mona Campus, Kingston 7, Jamaica.
Created Dec 2003. Links checked and/or last modified 9th December 2003.
URL http://wwwchem.uwimona.edu.jm/courses/Tanabe-Sugano/TanSugd7.html