# 📐 L2 Spec — Pump-Probe Spectroscopy / Imaging Mismatch-Only Spec
**ID:** `L2-150-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-150`](/artifact/l1/L1-150)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.55 · **Delta tier:** 5
> **⛓ On-chain block:** 41554232
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| N delays | — | 32 – 2048 |
| Pulse fs | — | 10 – 500 |
| Photon count | — | 50 – 10000 |
| Pulse jitter | — | 0.0 – 50.0 |
| N wavelengths | — | 64 – 4096 |
| Thermal drift | — | 0.0 – 0.3 |
| Delay stage drift | — | 0.0 – 5.0 |
| Two color overlap | — | 0.3 – 1.0 |
## 2. Tolerance (ε)
**Type:** `fn`
```
16.0 + 2.0 * log10(photon_count / 50) + 6.0 * two_color_overlap - 0.1 * pulse_jitter - 0.5 * delay_stage_drift
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.55 |
| Delta tier | 5 |
## 4. Fingerprint
`f0d018b42bc044294957fca7812cbd75fd0ff9eb50664211769304d3c1f9e829`
## 5. On-chain Registration
- **Chain hash:** `0x7209f01beed863a604e6f10b5b1accae5fa26f5935974128ff496f5079e2098a`
- **Chain tx hash:** `0xade05cf14fb408fa59e7187cdcc07717ec9b16d92c6d479e97d70d0bd18b0a5b`
- **Chain block:** `41554232`
---
## File Mapping
This bundle consists of: `L2-150-001.md`, `L2-150-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-150-001.md` | Source of truth — edit this | Human or LLM |
| `L2-150-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-150-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._