I recognise that schrodinger equation for hydrogen atom ( http://hyperphysics.phy-astr.gsu.edu/hbase.../hydsch.html#c2 ) is Laplace operator in spherical coordinates ( http://en.wikipedia.org/wiki/Laplace_opera...hree_dimensions ). Laplace operator in decard coordinates is divgrada . I am not very sure what it is grad and almost don't know that is div, but whatsoever, where I can see schrodinger equation for He atom? Do internet is so poor that don't have it? Also I doubt do it have advanced books.