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Visual evidence companion

See Hydrogen Bromide Spectral Control Architecture — Exact Projector, Exploratory Encoding for a plate-by-plate separation of verified HBr constants, exact $E_{47}$ projector algebra, exploratory residue routing, and the physical coupling still required.

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Canonical research boundary

Hydrogen bromide, HBr, is used here as a compact model system for quantum molecular physics: electronic structure, the Born–Oppenheimer approximation, rovibrational spectroscopy, the Morse oscillator, variational ground-state computation, open-system relaxation, and quantum algorithms.

The Drive corpus also proposes connections among HBr, entropy reduction, $E_{47}$, the ratio $47/125$, and trapped-ion experiments. Those connections are separated into established molecular physics, reproducible computation, candidate mathematical analogies, and unsupported experimental interpretations.

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Parent: Quantum Information Theory — States, Channels, Entropy, Error Correction, and Simulation

Audit date: July 17, 2026

Status key: ✅ established or directly reproducible · ◇ structural model · △ open bridge · ○ unsupported or speculative

Executive finding

HBr is an unusually useful teaching and benchmark molecule because it is simple enough to reduce to one dominant bond coordinate but rich enough to require serious quantum chemistry. It combines:

• a heteronuclear polar bond;
• a nondegenerate electronic ground state;
• quantized vibration and rotation;