Hi,
For calculations on nanoparticles of TiC I have observed in certain cases what appears to be a problem with D4 and I'm not sure if this is a problem with my input, the implementation of D4 in Turbomole or D4 itself. Specifically, for the particles in question, at least for certain "reasonable" geometries the DFT-D4 Energy contribution and nuclear repulsion + dispersion correction both return NaN. For example:
-------------------------------------------------
| Calculation Setup |
-------------------------------------------------
charge : 0
non-additivity corr. : ATM
charge model : EEQ
damping parameters
s6 : 1.0000
s8 : 2.0293
a1 : 0.4087
a2 : 4.5381
q(ref) CN(ref) cov. CN(ref) alpha(AIM,ref)
0.0000000 0.0000000 0.0000000 **********
0.3225917 1.8299290 1.6227897 37.1327072
0.5350595 3.8675444 3.4328125 32.3550068
q(ref) CN(ref) cov. CN(ref) alpha(AIM,ref)
0.0000000 0.0000000 0.0000000 12.3555336
-0.1712371 0.9867893 0.9189476 12.8040100
-0.1421000 1.9984766 1.9078606 9.6347083
-0.2225085 2.9987259 2.8312240 9.6866280
-0.2565392 3.9843988 3.7487004 7.6947605
-0.1044135 3.1417713 2.9183271 9.3751067
0.2103031 0.9999501 0.8556099 7.7402501
========================================================================
Edisp /kcal,au: NaN NaN
========================================================================
nuclear repulsion energy = 349145.092258260
DFT-D4 Energy contribution = NaN
nuclear repulsion + dispersion correction = NaN
This seems to occur both for version 7.5 and 7.5.1 (we don't yet have access to 7.6) and as a result the DFT total energies are also NaN and SCF calculations on these particular particles will never converge. I have tried different point group symmetries, including C1, but in all cases the same thing happens.
This problem does not happen in the case of D3 and sometimes even happens when restarting from a geometry previously optimised using D3. I attach an example below for the geometry of Ti108C108 previously optimised using B3LYP+D3/def2-SVP and which looks fine visualy, but gives NaN when restarting with B3LYP+D4/def2-SVP.
It would be great if someone knows what might be the problem.
Thanks,
Martijn
$coord
9.73712098157667 9.73712098157667 -9.73712098157667 ti
9.90325188464045 6.03416447504547 -9.90325188464045 c
5.94800077728955 5.94800077728955 -9.92087207484975 ti
9.92087207484975 5.94800077728955 -5.94800077728955 ti
5.94800077728955 9.92087207484975 -5.94800077728955 ti
9.90325188464045 9.90325188464045 -6.03416447504547 c
6.03416447504547 9.90325188464045 -9.90325188464045 c
5.97996447657782 5.97996447657782 -5.97996447657782 c
9.83922643983892 1.99744658630539 -9.83922643983892 ti
9.89830884166651 -1.95400739347906 -9.89830884166651 c
5.96319856407849 -1.98809833358298 -9.92698489070667 ti
9.92698489070667 -1.98809833358298 -5.96319856407849 ti
5.94889999985359 1.99313552650397 -5.94889999985359 ti
10.12446198367273 1.98388490988329 -6.04373742264148 c
6.04373742264148 1.98388490988329 -10.12446198367273 c
6.00949902529930 -2.00917512762406 -6.00949902529930 c
9.84314754003054 -5.91749395302955 -9.84314754003054 ti
9.70727933947391 -9.70727933947391 -9.70727933947391 c
5.91749395302955 -9.84314754003054 -9.84314754003054 ti
9.84314754003054 -9.84314754003054 -5.91749395302955 ti
5.93083994261668 -5.93083994261668 -5.93083994261668 ti
10.09894362824467 -5.99445296233209 -5.99445296233209 c
5.99445296233209 -5.99445296233209 -10.09894362824467 c
5.99445296233209 -10.09894362824467 -5.99445296233209 c
1.99744658630539 9.83922643983892 -9.83922643983892 ti
1.98388490988329 6.04373742264148 -10.12446198367273 c
-1.98809833358298 5.96319856407849 -9.92698489070667 ti
1.99313552650397 5.94889999985359 -5.94889999985359 ti
-1.98809833358298 9.92698489070667 -5.96319856407849 ti
1.98388490988329 10.12446198367273 -6.04373742264148 c
-1.95400739347906 9.89830884166651 -9.89830884166651 c
-2.00917512762406 6.00949902529930 -6.00949902529930 c
1.98726973672475 1.98726973672475 -9.94787422427563 ti
1.97530458274131 -1.97530458274131 -10.16754390547762 c
-1.98726973672475 -1.98726973672475 -9.94787422427563 ti
1.98198934562531 -1.98198934562531 -5.96364020410723 ti
-1.98198934562531 1.98198934562531 -5.96364020410723 ti
2.01066710984676 2.01066710984676 -6.05241685892999 c
-1.97530458274131 1.97530458274131 -10.16754390547762 c
-2.01066710984676 -2.01066710984676 -6.05241685892999 c
1.98809833358298 -5.96319856407849 -9.92698489070667 ti
1.95400739347906 -9.89830884166651 -9.89830884166651 c
-1.99744658630539 -9.83922643983892 -9.83922643983892 ti
1.98809833358298 -9.92698489070667 -5.96319856407849 ti
-1.99313552650397 -5.94889999985359 -5.94889999985359 ti
2.00917512762406 -6.00949902529930 -6.00949902529930 c
-1.98388490988329 -6.04373742264148 -10.12446198367273 c
-1.98388490988329 -10.12446198367273 -6.04373742264148 c
-5.91749395302955 9.84314754003054 -9.84314754003054 ti
-5.99445296233209 5.99445296233209 -10.09894362824467 c
-9.84314754003054 5.91749395302955 -9.84314754003054 ti
-5.93083994261668 5.93083994261668 -5.93083994261668 ti
-9.84314754003054 9.84314754003054 -5.91749395302955 ti
-5.99445296233209 10.09894362824467 -5.99445296233209 c
-9.70727933947391 9.70727933947391 -9.70727933947391 c
-10.09894362824467 5.99445296233209 -5.99445296233209 c
-5.96319856407849 1.98809833358298 -9.92698489070667 ti
-6.04373742264148 -1.98388490988329 -10.12446198367273 c
-9.83922643983892 -1.99744658630539 -9.83922643983892 ti
-5.94889999985359 -1.99313552650397 -5.94889999985359 ti
-9.92698489070667 1.98809833358298 -5.96319856407849 ti
-6.00949902529930 2.00917512762406 -6.00949902529930 c
-9.89830884166651 1.95400739347906 -9.89830884166651 c
-10.12446198367273 -1.98388490988329 -6.04373742264148 c
-5.94800077728955 -5.94800077728955 -9.92087207484975 ti
-6.03416447504547 -9.90325188464045 -9.90325188464045 c
-9.73712098157667 -9.73712098157667 -9.73712098157667 ti
-5.94800077728955 -9.92087207484975 -5.94800077728955 ti
-9.92087207484975 -5.94800077728955 -5.94800077728955 ti
-5.97996447657782 -5.97996447657782 -5.97996447657782 c
-9.90325188464045 -6.03416447504547 -9.90325188464045 c
-9.90325188464045 -9.90325188464045 -6.03416447504547 c
9.83922643983892 9.83922643983892 -1.99744658630539 ti
10.12446198367273 6.04373742264148 -1.98388490988329 c
5.94889999985359 5.94889999985359 -1.99313552650397 ti
9.92698489070667 5.96319856407849 1.98809833358298 ti
5.96319856407849 9.92698489070667 1.98809833358298 ti
9.89830884166651 9.89830884166651 1.95400739347906 c
6.04373742264148 10.12446198367273 -1.98388490988329 c
6.00949902529930 6.00949902529930 2.00917512762406 c
9.94787422427563 1.98726973672475 -1.98726973672475 ti
10.16754390547762 -1.97530458274131 -1.97530458274131 c
5.96364020410723 -1.98198934562531 -1.98198934562531 ti
9.94787422427563 -1.98726973672475 1.98726973672475 ti
5.96364020410723 1.98198934562531 1.98198934562531 ti
10.16754390547762 1.97530458274131 1.97530458274131 c
6.05241685892999 2.01066710984676 -2.01066710984676 c
6.05241685892999 -2.01066710984676 2.01066710984676 c
9.92698489070667 -5.96319856407849 -1.98809833358298 ti
9.89830884166651 -9.89830884166651 -1.95400739347906 c
5.96319856407849 -9.92698489070667 -1.98809833358298 ti
9.83922643983892 -9.83922643983892 1.99744658630539 ti
5.94889999985359 -5.94889999985359 1.99313552650397 ti
10.12446198367273 -6.04373742264148 1.98388490988329 c
6.00949902529930 -6.00949902529930 -2.00917512762406 c
6.04373742264148 -10.12446198367273 1.98388490988329 c
1.98726973672475 9.94787422427563 -1.98726973672475 ti
2.01066710984676 6.05241685892999 -2.01066710984676 c
-1.98198934562531 5.96364020410723 -1.98198934562531 ti
1.98198934562531 5.96364020410723 1.98198934562531 ti
-1.98726973672475 9.94787422427563 1.98726973672475 ti
1.97530458274131 10.16754390547762 1.97530458274131 c
-1.97530458274131 10.16754390547762 -1.97530458274131 c
-2.01066710984676 6.05241685892999 2.01066710984676 c
1.97734941906956 1.97734941906956 -1.97734941906956 ti
2.01582191326355 -2.01582191326355 -2.01582191326355 c
-1.97734941906956 -1.97734941906956 -1.97734941906956 ti
1.97734941906956 -1.97734941906956 1.97734941906956 ti
-1.97734941906956 1.97734941906956 1.97734941906956 ti
2.01582191326355 2.01582191326355 2.01582191326355 c
-2.01582191326355 2.01582191326355 -2.01582191326355 c
-2.01582191326355 -2.01582191326355 2.01582191326355 c
1.98198934562531 -5.96364020410723 -1.98198934562531 ti
1.97530458274131 -10.16754390547762 -1.97530458274131 c
-1.98726973672475 -9.94787422427563 -1.98726973672475 ti
1.98726973672475 -9.94787422427563 1.98726973672475 ti
-1.98198934562531 -5.96364020410723 1.98198934562531 ti
2.01066710984676 -6.05241685892999 2.01066710984676 c
-2.01066710984676 -6.05241685892999 -2.01066710984676 c
-1.97530458274131 -10.16754390547762 1.97530458274131 c
-5.96319856407849 9.92698489070667 -1.98809833358298 ti
-6.00949902529930 6.00949902529930 -2.00917512762406 c
-9.92698489070667 5.96319856407849 -1.98809833358298 ti
-5.94889999985359 5.94889999985359 1.99313552650397 ti
-9.83922643983892 9.83922643983892 1.99744658630539 ti
-6.04373742264148 10.12446198367273 1.98388490988329 c
-9.89830884166651 9.89830884166651 -1.95400739347906 c
-10.12446198367273 6.04373742264148 1.98388490988329 c
-5.96364020410723 1.98198934562531 -1.98198934562531 ti
-6.05241685892999 -2.01066710984676 -2.01066710984676 c
-9.94787422427563 -1.98726973672475 -1.98726973672475 ti
-5.96364020410723 -1.98198934562531 1.98198934562531 ti
-9.94787422427563 1.98726973672475 1.98726973672475 ti
-6.05241685892999 2.01066710984676 2.01066710984676 c
-10.16754390547762 1.97530458274131 -1.97530458274131 c
-10.16754390547762 -1.97530458274131 1.97530458274131 c
-5.94889999985359 -5.94889999985359 -1.99313552650397 ti
-6.04373742264148 -10.12446198367273 -1.98388490988329 c
-9.83922643983892 -9.83922643983892 -1.99744658630539 ti
-5.96319856407849 -9.92698489070667 1.98809833358298 ti
-9.92698489070667 -5.96319856407849 1.98809833358298 ti
-6.00949902529930 -6.00949902529930 2.00917512762406 c
-10.12446198367273 -6.04373742264148 -1.98388490988329 c
-9.89830884166651 -9.89830884166651 1.95400739347906 c
9.84314754003054 9.84314754003054 5.91749395302955 ti
10.09894362824467 5.99445296233209 5.99445296233209 c
5.93083994261668 5.93083994261668 5.93083994261668 ti
9.84314754003054 5.91749395302955 9.84314754003054 ti
5.91749395302955 9.84314754003054 9.84314754003054 ti
9.70727933947391 9.70727933947391 9.70727933947391 c
5.99445296233209 10.09894362824467 5.99445296233209 c
5.99445296233209 5.99445296233209 10.09894362824467 c
9.92698489070667 1.98809833358298 5.96319856407849 ti
10.12446198367273 -1.98388490988329 6.04373742264148 c
5.94889999985359 -1.99313552650397 5.94889999985359 ti
9.83922643983892 -1.99744658630539 9.83922643983892 ti
5.96319856407849 1.98809833358298 9.92698489070667 ti
9.89830884166651 1.95400739347906 9.89830884166651 c
6.00949902529930 2.00917512762406 6.00949902529930 c
6.04373742264148 -1.98388490988329 10.12446198367273 c
9.92087207484975 -5.94800077728955 5.94800077728955 ti
9.90325188464045 -9.90325188464045 6.03416447504547 c
5.94800077728955 -9.92087207484975 5.94800077728955 ti
9.73712098157667 -9.73712098157667 9.73712098157667 ti
5.94800077728955 -5.94800077728955 9.92087207484975 ti
9.90325188464045 -6.03416447504547 9.90325188464045 c
5.97996447657782 -5.97996447657782 5.97996447657782 c
6.03416447504547 -9.90325188464045 9.90325188464045 c
1.98809833358298 9.92698489070667 5.96319856407849 ti
2.00917512762406 6.00949902529930 6.00949902529930 c
-1.99313552650397 5.94889999985359 5.94889999985359 ti
1.98809833358298 5.96319856407849 9.92698489070667 ti
-1.99744658630539 9.83922643983892 9.83922643983892 ti
1.95400739347906 9.89830884166651 9.89830884166651 c
-1.98388490988329 10.12446198367273 6.04373742264148 c
-1.98388490988329 6.04373742264148 10.12446198367273 c
1.98198934562531 1.98198934562531 5.96364020410723 ti
2.01066710984676 -2.01066710984676 6.05241685892999 c
-1.98198934562531 -1.98198934562531 5.96364020410723 ti
1.98726973672475 -1.98726973672475 9.94787422427563 ti
-1.98726973672475 1.98726973672475 9.94787422427563 ti
1.97530458274131 1.97530458274131 10.16754390547762 c
-2.01066710984676 2.01066710984676 6.05241685892999 c
-1.97530458274131 -1.97530458274131 10.16754390547762 c
1.99313552650397 -5.94889999985359 5.94889999985359 ti
1.98388490988329 -10.12446198367273 6.04373742264148 c
-1.98809833358298 -9.92698489070667 5.96319856407849 ti
1.99744658630539 -9.83922643983892 9.83922643983892 ti
-1.98809833358298 -5.96319856407849 9.92698489070667 ti
1.98388490988329 -6.04373742264148 10.12446198367273 c
-2.00917512762406 -6.00949902529930 6.00949902529930 c
-1.95400739347906 -9.89830884166651 9.89830884166651 c
-5.94800077728955 9.92087207484975 5.94800077728955 ti
-5.97996447657782 5.97996447657782 5.97996447657782 c
-9.92087207484975 5.94800077728955 5.94800077728955 ti
-5.94800077728955 5.94800077728955 9.92087207484975 ti
-9.73712098157667 9.73712098157667 9.73712098157667 ti
-6.03416447504547 9.90325188464045 9.90325188464045 c
-9.90325188464045 9.90325188464045 6.03416447504547 c
-9.90325188464045 6.03416447504547 9.90325188464045 c
-5.94889999985359 1.99313552650397 5.94889999985359 ti
-6.00949902529930 -2.00917512762406 6.00949902529930 c
-9.92698489070667 -1.98809833358298 5.96319856407849 ti
-5.96319856407849 -1.98809833358298 9.92698489070667 ti
-9.83922643983892 1.99744658630539 9.83922643983892 ti
-6.04373742264148 1.98388490988329 10.12446198367273 c
-10.12446198367273 1.98388490988329 6.04373742264148 c
-9.89830884166651 -1.95400739347906 9.89830884166651 c
-5.93083994261668 -5.93083994261668 5.93083994261668 ti
-5.99445296233209 -10.09894362824467 5.99445296233209 c
-9.84314754003054 -9.84314754003054 5.91749395302955 ti
-5.91749395302955 -9.84314754003054 9.84314754003054 ti
-9.84314754003054 -5.91749395302955 9.84314754003054 ti
-5.99445296233209 -5.99445296233209 10.09894362824467 c
-10.09894362824467 -5.99445296233209 5.99445296233209 c
-9.70727933947391 -9.70727933947391 9.70727933947391 c