19.1.20 MK00B: Exchange Functional for Accurate Virtual Orbital Energies

F. R. Manby and P. J. Knowles, J. Chem. Phys. 112, 7002 (2000)

MK00 with gradient correction of the form of B88X.

$$K= \sum_s -{\frac {3\pi \,\rho_{s}^{3}}{\tau_{s}- \upsilon_{... ...i_{s}^{2}}{1+6\,\beta\,\chi_{s}{\,\text{arcsinh}}(\chi_{s})}} ,$$ (93)

where

$$\beta= 0.0016 .$$ (94)