Abstract
The effect of pressure has been measured on the absorption spectra of NiCl2, NiBr2, Ni(NH3)6Cl2, CoCl2, CoBr2, MnCl2, and MnBr2. The pressure shifts in every case correspond to increase in crystal field strength. To account for the shifts in a quantitative manner it is necessary to presume that the Racah parameter B decreases with increasing pressure. This can be interpreted as an increase in covalency at high pressure. From the data on MnCl2 and MnBr2 it is possible to establish limitations on the possible range of values of the parameter ε introduced by Koide and Pryce to describe covalency in transition metal complexes.
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