CFOUR_GAMMA_ABCD

Used to control the handling and storage of two-particle density matrix elements with four virtual indices \(\Gamma(abcd)\). DISK (=0) directs the program to calculate and store all elements of \(\Gamma(abcd)\), while DIRECT (=1) tells the program to use alternative algorithms in which \(\Gamma(abcd)\) is calculated and used “on the fly”. Note that this option might be not available for all type of calculations.

• Type: string

• Possible Values: DISK, DIRECT

• Default: DISK