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	1533	November 22, 2024
Unexpected Energy Ordering in TDDFT Nonequilibrium PCM Questions	1	47	June 24, 2026
Amber force field generation Questions	3	75	June 23, 2026
What sort of SCF calculations are supported with external fields? Questions	5	114	June 16, 2026
CDFT-CI Coupling convergence issue Questions	5	143	June 15, 2026
ALMO-EDA/COVP SCF Convergence Failure for Open-Shell Anion Radical System Questions	6	192	June 13, 2026
Lowering amplitude threshold when doing eom CCSD job Questions	0	78	June 11, 2026
Error in RI-EA-CC2 calculation Questions	4	337	June 7, 2026
FCIDUMP support Questions	1	104	June 5, 2026
Upgrade to DFT-D4 in QChem 6.4 Questions	1	128	June 4, 2026
Electronic structures of TDDFT-1D states Questions	0	126	June 2, 2026
Challenges in CDFT Geometry Optimization Using aug-cc-pVDZ Questions	1	135	May 29, 2026
Simulating Vibronic and Resonance Raman Spectroscopy Using the VIBRONIC module of Q-Chem How To	18	4310	May 25, 2026
QM/EFP Setup in Q-Chem with Ghost Atoms Only (Excess Electron in Cavity) Questions	1	816	May 22, 2026
Restarting finite difference frequency jobs Questions	4	1677	May 18, 2026
“ADC(3) singlet and triplet excited states with PCM – input and disk quota issues” Questions	4	603	May 18, 2026
aug-cc-pV5Z with external charges Questions	3	241	May 13, 2026
CDFT block set up How To	1	209	May 7, 2026
New basis set - excited states of Argon Questions	3	261	May 5, 2026
PES scan not respecting mem_total Questions	6	233	May 4, 2026
How to use SGM method to calculate triplet excited states with ROKS? Questions	3	314	May 3, 2026
Improving the accuracy of CPHF Questions	1	205	May 1, 2026
TDDFT SOC results Questions	3	326	April 28, 2026
Failure in Frequency job Questions	3	242	April 24, 2026
Webinar 87: Improvements in the OO-DFT user interface Webinars	0	225	April 23, 2026
Facing convergence issue with CDFT geometry optimization Questions	1	227	April 22, 2026
Loading basis set from file? Questions	1	222	April 22, 2026
Non-adiabatic bimolecular reaction dynamics Questions	5	328	April 18, 2026
Energy inconsistency with PySCF / adcc Questions	3	328	April 17, 2026
Facing Imaginary frequency in excited state Questions	1	254	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…