Pith Number

pith:B5CEHBLD

pith:2009:B5CEHBLDQI63KLGVYH3JHRC6CM

not attested not anchored not stored refs pending

Two-photon decay of excited levels in hydrogen: the ambiguity of the separation of cascades and pure two-photon emission

D. Solovyev, G. Plunien, L. Labzowsky

arxiv:0904.2346 v2 · 2009-04-15 · physics.atom-ph · astro-ph.CO

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{B5CEHBLDQI63KLGVYH3JHRC6CM}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-18T04:07:40.927197Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0f44438563823db52cd5c1f693c45e132c12bad5e99c6ce7fcb7069b54d2a5b3

Aliases

arxiv: 0904.2346 · arxiv_version: 0904.2346v2 · doi: 10.48550/arxiv.0904.2346 · pith_short_12: B5CEHBLDQI63 · pith_short_16: B5CEHBLDQI63KLGV · pith_short_8: B5CEHBLD

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/B5CEHBLDQI63KLGVYH3JHRC6CM \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 0f44438563823db52cd5c1f693c45e132c12bad5e99c6ce7fcb7069b54d2a5b3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "02c5cbfc7bb1ac2584269f851c33cb123101cd4c95384edd33fc5ebb506ebfcd",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.atom-ph",
    "submitted_at": "2009-04-15T16:01:59Z",
    "title_canon_sha256": "01b392610f580f1f3f1771122fb0394283ea45dde171fd3c53fb1d80c4a068c4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.2346",
    "kind": "arxiv",
    "version": 2
  }
}