In the 1960s, Clementi and Raimondi calculated these quantities used self consistent field wave functions instead of the usual Slater-type orbitals, allowing them to better account for penetration at the core.
In the 1960s, Clementi and Raimondi calculated these quantities used self consistent field wave functions instead of the usual Slater-type orbitals, allowing them to better account for penetration at the core. This quantity is often used as a tunable parameter when doing calculations using variational methods; for instance, the ground state of the helium atom is minimized when this quantity is 27/16. This quantity can be calculated using (*) Slater's rules, an example of which is that 1s electrons decrease the value of this quantity by 0.30, and this quantity is taken over the covalent radius squared in the Allred-Rochow scale of electronegativity. This quantity is different from the number of protons times the proton's charge due to electron shielding. For 10 points, name this measure of how much positive charge an electron feels from the nucleus.
In the 1960s, Clementi and Raimondi calculated these quantities used self consistent field wave functions instead of the usual Slater-type orbitals, allowing them to better account for penetration at the core.
effective nuclear charge (accept Z-effective; accept shielding constants until "electronegativity"; prompt on "Z" or "core charge")