{"artifact_id":"L1-931","layer":"L1","title":"Atomically Precise Manufacturing — Mechanosynthesis","domain":"Nanotechnology","sub_domain":"Molecular Manufacturing","physics_fingerprint":{"title":"Atomically Precise Manufacturing — Mechanosynthesis","domain":"Nanotechnology","chapter":"Ch.15 Materials & Nanotechnology","sub_domain":"Molecular Manufacturing","forward_model":"Mechanosynthesis: a tip-bound reactive moiety is positioned over a substrate; reaction outcome from the DFT energy landscape E(r) and barrier ΔE‡ along the approach coordinate, with thermal/positional noise setting placement yield.","challenge_blurb":"Build matter atom by atom — place reactive groups with positional control to assemble structures no bulk chemistry can reach.","challenge_group":"nano","challenge_short":"Atomically Precise Manufacturing","grand_challenge":true,"governing_equation":"rate ∝ exp(−ΔE‡/k_BT);   yield = P(correct site | σ_position, E(r))"},"observable_profile":{"unit":"correct-placement yield (higher better)","floor":0.9,"metric":"placement_yield","sota_reference":"STM atom manipulation + DFT mechanosynthesis tooltip studies"},"size_tiers":{"tip_paths":[10,100,1000],"atoms_placed":[1,100,10000]},"hardness_fn":{"type":"grand_challenge","metric":"placement_yield","baseline":"Fixed straight-line approach","delta_tier":50},"initiator_dataset":[{"name":"DFT mechanosynthesis reaction-path corpus","weight":0.6,"ipfs_cid":null,"license_hash":null},{"name":"STM atom-manipulation trajectory set","weight":0.4,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":5000.0,"chain_hash":null,"chain_tx_hash":null,"chain_block":null}