Tanabe-Sugano diagrams via spreadsheets
A set of spreadsheets has been developed to aid in spectral
Alternatively a single ZIP file
containing all of the above spreadsheets can be downloaded.
See the instructions for more
Originally only the spin-allowed transition energies were calculated.
Since then Horst Stratemeier generously provided info on how
the data points used to create the diagrams in the Ligand Field Theory
text by Figgis and Hitchman were generated. A set of runs was then done
using CAMMAG and a small script was written to manipulate the output data
into spreadsheets to give the Tanabe-Sugano diagrams
that now contain both spin-allowed and spin-forbidden lines.
Procedure for a Cr(III) system using the d3 diagram
A laboratory experiment based on this is described in more
detail in the
CHEM2110 lab manual. An interactive web page can be
used to do this more easily since a TS applet has been created
to display the d3 diagram and this is fed information from
- Print the appropriate Tanabe-Sugano diagram and locate where
the ratio of the second to first peak matches that found
- Tabulate the values of v1 / B, v2 / B, v3 / B from the
Y-intercepts and Δ/B from the
1. Ligand Field Theory and its applications, B.N. Figgis and
M.A. Hitchman, Wiley-VCH, New York, 2000.
2. Cruse, D. A., Davies, J. E., Harding, J. H., Gerloch, M., Mackey, D. J.,
McMeeking, R. F., CAMMAG, a Fortran Program (1980), Cambridge.
Copyright © 2019 by Robert John
Lancashire, all rights reserved.
Created and maintained by Prof. Robert J.
The Department of Chemistry, University of the West Indies,
Mona Campus, Kingston 7, Jamaica.
Created Feb 1999. Links checked and/or last
modified 2nd April 2019.