Using Lebedev and Popov spherical grids in a discrete variable representation makes hydrogen-in-crossed-fields energies converge faster than with a product of Gaussians, and Popov is fastest.
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2D Nondirect Product Discrete Variable Representation for Schr\"odinger Equation with Nonseparable Angular Variables
Using Lebedev and Popov spherical grids in a discrete variable representation makes hydrogen-in-crossed-fields energies converge faster than with a product of Gaussians, and Popov is fastest.