Internal conversion and the crossing of molecular potential energy surfaces

摘要: A re-examination is made of the Landau-Zener formula relating to probability an electronic jump near crossing-point two potential energy curves (or surfaces). Three cases are distinguished: discrete-discrete, discrete-continuum and continuum-continuum transitions. Different formulae obtained for each these cases. These involve certain matrix elements interaction between curves. careful analysis order magnitude terms that appear, some corrections previous work. It appears limits within which original valid seldom found in actual practice. new (50) greater validity presented.