# https://doi.org/10.1080/1478643031000091454
    # https://doi.org/10.1557/opl.2012.520
    # https://doi.org/10.1103/PhysRevB.85.184103
    &FORCEFIELD
      ZBL_SCATTERING off
      &CHARGE
        ATOM U
        CHARGE +3.227252
      &END CHARGE
      &CHARGE
        ATOM O
        CHARGE -1.613626
      &END CHARGE
      &NONBONDED
        &BUCK4RANGES
          ATOMS O O
          A [eV] 11272.6
          B [Angstrom^-1] 1/0.1363
          C [eV*Angstrom^6] 134.0
          R1 [Angstrom] 1.2
          R2 [Angstrom] 2.1
          R3 [Angstrom] 2.6
          # POLY1 [eV] 479.955320080974 -726.31182326300658189600 437.46708714153984869883 -130.69424768757823118006 19.32441467525360647073 -1.13054550680921504060
          # POLY2 [eV] 42.891690970163 -29.36749918557121222274 6.46231710894909716023 -0.46402483936962076198
          RCUT [Angstrom] 10.4
        &END BUCK4RANGES
        &WILLIAMS
          ATOMS O U
          A [eV] 566.498
          B [Angstrom^-1] 1/0.42056
          C [eV*Angstrom^6] 0.0
          RCUT [Angstrom] 10.4
        &END WILLIAMS
        &WILLIAMS
          ATOMS U U
          A [eV] 0.0
          B [Angstrom^-1] 0.0
          C [eV*Angstrom^6] 0.0
          RCUT [Angstrom] 10.4
        &END WILLIAMS
      &END NONBONDED
      &SPLINE
        EMAX_ACCURACY [hartree] 0.02
        EMAX_SPLINE [hartree] 1.0E4
        EPS_SPLINE [hartree] 1.0E-7
        R0_NB [Angstrom] 0.1
      &END SPLINE
    &END FORCEFIELD