MO diagram: on-the-fly fragment orbitals with ECCE-QM for casual diagrams
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评估
- 难度
- 5/5
- 预计耗时
- 一周以上
- 新手友好度
- 35/100
- Issue 类型
- 功能
- 描述清晰度
- 基本清楚
- 活跃度
- 活跃
- 技术栈
- c
调研方向
Start by reading the related issues #201 and #252 to understand existing fragment calculations and fragment definitions. Then trace how the MO correlation diagram is built and how ECCE-QM exposes single-point calculations, basis selection, and integrals for orbital overlaps. Done means the diagram can show projected ligand group orbitals using the parent basis and identify the fragment-orbital method it used.
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描述
The correlation diagram needs fragment orbitals to show ligand group orbitals properly; today that means fragment calculations made by hand (#201). For a casual diagram, ECCE can make them itself:
- Split the molecule into the metal and its ligands (fragment definitions, #252).
- Run a quick ECCE-QM single point on each ligand at the parent geometry, in the parent calculation's own basis set (ECCE-QM accepts an explicit basis), so fragment and parent orbitals are expanded in the same atomic functions, whatever code ran the parent.
- Project the parent MOs onto the ligand orbitals (overlaps from ECCE-QM's integrals) to get the ligand group orbitals and the correlation lines.
Small ligands (CO, NH3, Cl-, PH3) take seconds each. A Hückel or semi-empirical variant would be faster but uses a different basis, so projections are approximate; ECCE-QM in the parent basis is the default. Quantitative work keeps real fragment calculations (#201). The diagram states which kind of fragment orbitals it shows. Related: #132, #201, #252. Suggested by the maintainer, 2026-10-12.
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