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Frequency calculation speedup
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1
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314
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February 19, 2026
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What is the correct input for the GEOM_OPT_MODE
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2
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193
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February 19, 2026
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Large number of imaginary frequencies with ROKS and delta SCF
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1
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159
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February 19, 2026
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Ehrenfest Molecular Dynamics
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2
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170
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February 19, 2026
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S1 Geom optimization based on TDDFT and delta SCF approach
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11
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289
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February 18, 2026
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Q-Chem license on new MacOS
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0
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179
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February 17, 2026
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Stuck CCSD frequency calculation
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2
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196
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February 16, 2026
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Issue with designing functionals
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4
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164
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February 15, 2026
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COSMO input file
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2
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172
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February 13, 2026
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VQCCD single point calculation issue
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0
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156
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February 13, 2026
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RIXS with TDDFT
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0
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144
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February 12, 2026
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Wrong multiplicity for large multiplicity element when using projection based embedding
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3
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150
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February 12, 2026
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Ground state out of equilibrium calculation
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3
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245
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February 11, 2026
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Is it possible to use the NTO-rotated orbitals (for a specific TDDFT state) as the MO set in a subsequent Q-Chem job?
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8
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458
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February 9, 2026
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CASSCF with Nonadiabatic Coupling
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1
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155
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February 6, 2026
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Complex Scaling on Q-Chem
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3
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332
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February 6, 2026
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SOC for Diabatic-State-Based Methods
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3
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231
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February 2, 2026
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Visualization/export of SF-TDDFT orbitals
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5
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356
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January 27, 2026
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Error while running frequency calculation
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4
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263
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January 27, 2026
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Frozen atoms move during optimization
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2
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332
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January 27, 2026
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Truncation of non-bonded interactions in QM/MM
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1
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206
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January 26, 2026
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Webinar 85: XCIS-CVS: Core-level Spectroscopy in Q-Chem
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0
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244
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January 23, 2026
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How to read saved scratch file for hessian
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1
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237
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January 22, 2026
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Issue with FRAGMO Optimization: Structural Distortion
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1
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223
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January 20, 2026
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MRSF Transition dipole moment
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2
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252
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January 20, 2026
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Single Na ion calculation using MP2
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2
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245
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January 16, 2026
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Using SF-TDDFT single-point energies for TS optimized at DFT level
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1
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238
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January 13, 2026
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Which value to choose when calculating SOC?
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3
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280
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January 13, 2026
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Energy conservation problems during dynamics , bond breaking and forming for collision reaction
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1
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241
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January 11, 2026
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Trouble using EOM-CCSD, with frozen core
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9
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379
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January 9, 2026
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