Abstract
We have implemented the technique of exterior complex scaling via inward numerical integration of the complex-eigenvalue Schrödinger equation for resonances. The method has been tested successfully on three physically meaningful model potentials, the (12, 6) Lennard-Jones, the cubic anharmonic oscillator and the exponential, and on the vibrational resonances of He 2 2+, 1Σ g +, whose potential goes asymptotically as 1/ R. Widths as small as 10 −15 au have been computed.
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