Hello, I want to compute excitation energies of an organic compound (52 atoms). Unfortunately the calculation stopped due to the wall time limit. Thus I was wondering if it is possible to restart it. Or do you have any tips to decrease the time necessary for the calculation to be complete ? ( Changing the basis set will be the last resort option…)
I am using QChem 6.0.
I displayed below the input and the end of the output file
Have a nice day ! 
Input :
$rem
ADC_DAVIDSON_MAXITER 200
ADC_DAVIDSON_CONV 4
METHOD adc(2)
BASIS cc-pVDZ
aux_basis rimp2-vdz
EE_SINGLETS 5
EE_TRIPLETS 5
STS_MOM true
STATE_ANALYSIS TRUE
ADC_PROP_ES2ES TRUE
ADC_PROP_ES TRUE
solvent_method PCM
MEM_TOTAL 500000
MEM_STATIC 2000
$end
$pcm
theory IEFPCM
ChargeSeparation Marcus
StateSpecific Perturb
$end
$solvent
Dielectric 2.38
OpticalDielectric 1.9599999999999997
$end
$molecule
0 1
End of the output :
Starting Davidson for singlet states of irrep A …
It NVec Conv Avg. Norm Max. Norm Conv. states Remark
5 0 2.939e-01 6.856e-01 0.3544 n n n n n Guess.
1 10 0 1.694e-01 5.813e-01 0.1379 n n n n n
2 15 0 4.170e-02 1.564e-01 0.1077 n n n n n
3 20 0 2.047e-02 5.602e-02 0.1042 n n n n n