The method uses a series of parametrized energies calculated from atomic ionisation potentials or theoretical methods to fill the diagonal of the Fock matrix.
2.
Because ionisation potential of argon atoms is lower than that of the hydrogen molecule, in contrast to that of helium or neon ) the argon ion reacts with molecular hydrogen.
3.
The first ionisation potential of thorium was measured to be ( 6.08 ?0.12 ) eV in 1974; more recent measurements have refined this to 6.3067 eV.
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