RESEARCH USE
Where ORCA fits
Specify geometry, charge, multiplicity, electronic-structure method, basis set, solvent, and convergence settings in an input file, then run energy, optimization, frequency, spectroscopy, or reaction-property calculations. Preserve complete inputs and outputs, program version, parallel environment, and intermediate files, and examine convergence, wavefunction stability, stationary-point character, and method and basis sensitivity.
Research tasks
- Calculate molecular electronic structures, energies, and geometries
- Predict vibrational, electronic, and magnetic-resonance properties
- Study reaction paths, excited states, and multireference problems
What to evaluate before use
- Numerical convergence does not establish model suitability. Charge, spin, basis, dispersion, solvent, and relativistic treatment can all change a conclusion, so consequential results need benchmarks or experimental comparison.
- ORCA is free for academic and personal use but is not open-source software. Commercial use requires licensing through FACCTs, and eligibility should be checked against the current official terms.
Verification note
This entry summarizes the resource's role without assessing scientific accuracy or endorsing its outputs. Features and terms can change; consult the official source before adopting it for consequential work.
quantum chemistryelectronic structure
Last verified: 2026-09-22
Source: official documentation ↗