Nuclear Model
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   NuclearModel [PointCharge | Gaussian | Uniform]

"NuclearModel"
   Type:
      Multiple Choice

   Default value:
      PointCharge

   Options:
      [PointCharge, Gaussian, Uniform]

   Description:
      Specify what model to use for the nucleus.                   For
      the Gaussian model the nuclear radius is calculated according to
      the work of Visscher and Dyall (L. Visscher, and K.G. Dyall,
      Dirac-Fock atomic electronic structure calculations using
      different nuclear charge distributions, Atomic Data and Nuclear
      Data Tables 67, 207 (1997))
