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Relativistic 2e integrals#399

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kshitij-05 wants to merge 8 commits intomasterfrom
kshitij/feature/2e_rkb_ints
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Relativistic 2e integrals#399
kshitij-05 wants to merge 8 commits intomasterfrom
kshitij/feature/2e_rkb_ints

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@kshitij-05
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@kshitij-05 kshitij-05 commented Feb 9, 2026

  • Implement 2-electron 4-center relativistic integrals with restricted kinetic balance condition (RKB).

    • (LL|SS)
    • (SS|SS)
  • Implement 2e 3-center relativistic integrals with RKB.

    • (X|SS)
    • (X|LS)
  • erf attenuated σpVσp 1-e integrals

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@loriab loriab left a comment

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I just noticed this and saw some tweaks to propose. You might want to add the new class to INSTALL.md, too.

message(VERBOSE "setting components ${_amlist}")

foreach(_cls ONEBODY;ERI;ERI3;ERI2;G12;G12DKH)
foreach(_cls ONEBODY;ERI;RKB_ERI;ERI3;ERI2;G12;G12DKH)
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there's a slight disadv to the underscore if ppl are splitting the integral codes (e.g., rkb_eri_ffff_d1) on underscore, but I think RKB_ERI is fine.

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