Greetings,

# I am trying to run a spin-orbit coupling calculation. However, I am getting the following warning which I am not sure I can ignore or not. Based on a similar topic on Q-Chem Talk, I got the impression that I shouldn’t be getting the warning and instead should be getting something similar to this:

```
SPIN-ORBIT COUPLING BETWEEN THE SINGLET GROUND STATE AND EXCITED TRIPLET STATE
```

=======================================================================================

The warning I get:

**Q-Chem warning in module anlman/spin_orbit_couple.C, line 322:**

** Spin-orbit coupling calculations are only implemented for**

** restricted CIS/TDDFT at this time.**

Below is my $rem and thank you for your help.

$rem

BASIS = GENERAL

ECP = GENERAL

ECP_FIT = TRUE

MEM_STATIC = 2000

MEM_TOTAL = 80000

MOLDEN_FORMAT =1

SYMMETRY = FALSE

SYM_IGNORE = TRUE

CIS_N_ROOTS = 10

CIS_CONVERGENCE = 8

CIS_SINGLETS = TRUE

CIS_TRIPLETS = TRUE

EXCHANGE = B3LYP

GUI = 2

NBO = 2

NTO_PAIRS = 2

UNRESTRICTED = 1

CALC_SOC = true

SET_ITER = 300

THRESH = 14

POP_MULLIKEN = 2

MAXSCF = 1700

MAX_CIS_CYCLES = 1000

SCF_CONVERGENCE = 5

SCF_ALGORITHM = DIIS_GDM

$end