			15min:

THEORY OF r_m^(2) STRUCTURAL PARAMETERS.

JAMES K. G. WATSON, Steacie Institute for Molecular Sciences, National Research Council, Ottawa, Ontario, Canada K1A OR6.

The r_m^(2) method described in the previous paper is discussed on the assumption that the isotopic changes in epsilon ₀ are adequately represented by the equation Delta epsilon ₀=\sum_i(\partial epsilon ₀/\partial m_i) Delta m_i. A formula is calculated for \partial epsilon ₀/\partial m_i in terms of the basic potential constants and coupling parameters of the molecule. Use of this formula then gives an approximate expression for the [r_m^(2)-r_e] differences in the structural parameters. Numerical tests of this expression are in progress.