(HP-65) Thermochemical Radii (kapustinskii equation)

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An extract from A Thermodynamic Investigation of Some Alkali-Metal Polyhalide Compounds, Stuart John Peake (PhD thesis), University of London, January 1976 (194 pages)

… although it is necessary to make several assumptions, the Kapustinskii equation provides a useful method to obtain approximate lattice energies, especially when the experimental data necessary for more precise calculation is lacking.
A computer programme … was employed to calculate the 'thermochemical radii' contained in Table 3 of this Appendix … an identical programme {pages 177-179} was written for use with a Hewlett Packard HP-65 programmable calculator.

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