Examples: H2 potential curve (RHF/UHF/CCSD, Morse fit) and chirality (enantiomers, diastereomers)

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Start by exploring the existing example calculations opened through File > Open Example Calculations and the scan panel. The issue describes H₂ potential curves with RHF, UHF and CCSD, a Morse fit, and chirality comparisons for alanine and other stereoisomers. Done means adding both example sets with the specified calculations and comparisons; the payload does not identify relevant files or tests.

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描述

enhancement

New example calculations (File > Open Example Calculations); SN1/E1/E2 are under #447.

  • H₂ potential curve. Rigid scan of H–H from 4.0 Å inwards in 37 steps of −0.1 Å, with RHF, UHF (broken-symmetry guess) and CCSD (full CI for two electrons) on the same grid. RHF goes to the wrong ionic+covalent limit. UHF goes to the right limit with spin contamination beyond the Coulson–Fischer point (about 1.2 Å). An outward scan beside the inward one shows the SCF solution following. A "fit Morse" option in the scan panel (Dₑ, a, rₑ, ωₑ), compared with experiment (rₑ 0.741 Å, ωₑ about 4401 cm⁻¹, D₀ 4.48 eV).
  • Chirality. R- and S-alanine side by side, with identical energies, frequencies and IR, differing only in chiroptical properties (ECD from TD-DFT, VCD, optical rotation). L-alanine is S but L-cysteine is R. Threonine or isoleucine (two stereocentres) show that diastereomers, unlike enantiomers, differ in energy.
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