Q-Chem Talk

Topic	Replies	Views	Activity
Report SCF (HF/DFT) Convergence Issues Questions Dear Q-Chem Community, If you have any SCF (HF/DFT) jobs that are time-consuming or are facing convergence difficulties with Q-Chem, please send them to support@q-chem.com with the subject line “SCF Convergence Issue” t…	3	1526	November 22, 2024
Unexpected Energy Ordering in TDDFT Nonequilibrium PCM Questions	1	26	June 24, 2026
Amber force field generation Questions	3	40	June 23, 2026
What sort of SCF calculations are supported with external fields? Questions	5	88	June 16, 2026
CDFT-CI Coupling convergence issue Questions	5	117	June 15, 2026
ALMO-EDA/COVP SCF Convergence Failure for Open-Shell Anion Radical System Questions	6	160	June 13, 2026
Lowering amplitude threshold when doing eom CCSD job Questions	0	61	June 11, 2026
Error in RI-EA-CC2 calculation Questions	4	319	June 7, 2026
FCIDUMP support Questions	1	85	June 5, 2026
Upgrade to DFT-D4 in QChem 6.4 Questions	1	105	June 4, 2026
Electronic structures of TDDFT-1D states Questions	0	111	June 2, 2026
Challenges in CDFT Geometry Optimization Using aug-cc-pVDZ Questions	1	112	May 29, 2026
Simulating Vibronic and Resonance Raman Spectroscopy Using the VIBRONIC module of Q-Chem How To	18	4247	May 25, 2026
QM/EFP Setup in Q-Chem with Ghost Atoms Only (Excess Electron in Cavity) Questions	1	137	May 22, 2026
Restarting finite difference frequency jobs Questions	4	1664	May 18, 2026
“ADC(3) singlet and triplet excited states with PCM – input and disk quota issues” Questions	4	596	May 18, 2026
aug-cc-pV5Z with external charges Questions	3	222	May 13, 2026
CDFT block set up How To	1	187	May 7, 2026
New basis set - excited states of Argon Questions	3	238	May 5, 2026
PES scan not respecting mem_total Questions	6	209	May 4, 2026
How to use SGM method to calculate triplet excited states with ROKS? Questions	3	255	May 3, 2026
Improving the accuracy of CPHF Questions	1	191	May 1, 2026
TDDFT SOC results Questions	3	307	April 28, 2026
Failure in Frequency job Questions	3	226	April 24, 2026
Webinar 87: Improvements in the OO-DFT user interface Webinars	0	211	April 23, 2026
Facing convergence issue with CDFT geometry optimization Questions	1	210	April 22, 2026
Loading basis set from file? Questions	1	211	April 22, 2026
Non-adiabatic bimolecular reaction dynamics Questions	5	314	April 18, 2026
Energy inconsistency with PySCF / adcc Questions	3	304	April 17, 2026
Facing Imaginary frequency in excited state Questions	1	239	April 17, 2026

Report SCF (HF/DFT) Convergence Issues

Dear Q-Chem Community, If you have any SCF (HF/DFT) jobs that are time-consuming or are facing convergence difficulties with Q-Chem, please send them to support@q-chem.com with the subject line “SCF Convergence Issue” t…