Pith Number

pith:ECDWMWWF

pith:2019:ECDWMWWFPQ3SQDETS25GLB5TSW

not attested not anchored not stored refs pending

Precision measurement of the ionization energy and quantum defects of 39K I

Felix Helmrich, Fr\'ed\'eric Merkt, Hansj\"urg Schmutz, Johannes Deiglmayr, Jonas Butscher, Josef Anton Agner, Michael Peper

arxiv:1907.02776 v1 · 2019-07-05 · physics.atom-ph · quant-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ECDWMWWFPQ3SQDETS25GLB5TSW}

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	2026-05-17T23:41:23.152947Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2087665ac57c37280c9396ba6587b395b0bf11411a02f98b8109233cf594bd0b

Aliases

arxiv: 1907.02776 · arxiv_version: 1907.02776v1 · doi: 10.48550/arxiv.1907.02776 · pith_short_12: ECDWMWWFPQ3S · pith_short_16: ECDWMWWFPQ3SQDET · pith_short_8: ECDWMWWF

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/ECDWMWWFPQ3SQDETS25GLB5TSW \
  | 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: 2087665ac57c37280c9396ba6587b395b0bf11411a02f98b8109233cf594bd0b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a1c8c6f151b617642a1bb085a0a566963beaae7ddcbc1bc1881f550441dcb6d7",
    "cross_cats_sorted": [
      "quant-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.atom-ph",
    "submitted_at": "2019-07-05T11:29:34Z",
    "title_canon_sha256": "2f39b04975af720c5f52ea534b997e5fb8d90bb23ed106ceea730c12dbc323d9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1907.02776",
    "kind": "arxiv",
    "version": 1
  }
}