# Evidence for population inversion in excited electron states of a double barrier resonant

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We have devised a semiclassical procedure based on the Makriâ€“Miller [J. Chem. Phys. 91, 4026 (1989)] model for calculating the eigenvalue splitting in many-atom systems and have used it to calculate the ground-state splitting in several isotopomers of malonaldehyde. A potential-energy...

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