ALDAX
ALDAX = [real]
Default: ALDAX = 1.0-AEXX if LHFCALC=.TRUE. or 1.0 if LHFCALC=.FALSE.
Description: ALDAX is a parameter that multiplies the LDA exchange functional or the LDA part of a GGA exchange functional.
ALDAX can be used as the fraction of LDA exchange in a Hartree-Fock/LDA or Hartree-Fock/GGA hybrid functional.
The sum of the fraction of the exact exchange and LDA exchange is always 1.0, and it is not possible to set the amount of LDA exchange independently. Examples: if AEXX=0.25, 1/4 of the exact exchange is used, and 3/4 of the LDA exchange is added. For AEXX=0.5, half of the exact exchange is used, and one half of the LDA exchange is added.
Related tags and articles
AEXX, ALDAC, AGGAX, AGGAC, AMGGAX, AMGGAC, LHFCALC, List of hybrid functionals