{
  "annotation_id": "e2a64914-e03e-4c47-b3c7-be7d5795bfc3",
  "date_created": "2026-03-02T18:01:24.817000Z",
  "date_modified": "2026-03-02T18:01:24.817000Z",
  "file_hash": "2ae7542aad7fa0aa4320446732302d51cea5d80b00157778b7cd9ac5e8c5873f",
  "private": false,
  "record": {
    "abstract": "Second-order [O(k^2), k=omega/c] nondipole effects in soft-x-ray\nphotoemission are demonstrated via an experimental and theoretical study of\nangular distributions of neon valence photoelectrons in the 100--1200 eV\nphoton-energy range. A newly derived theoretical expression for nondipolar\nangular distributions characterizes the second-order effects using four new\nparameters with primary contributions from pure-quadrupole and octupole-dipole\ninterference terms. Independent-particle calculations of these parameters\naccount for a significant portion of the existing discrepancy between\nexperiment and theory for Ne 2p first-order nondipole parameters.",
    "arxiv_id": "physics/9908033",
    "authors": [
      "A. Derevianko",
      "O. Hemmers",
      "S. Oblad",
      "P. Glans",
      "H. Wang",
      "S. B. Whitfield",
      "R. Wehlitz",
      "I. A. Sellin",
      "W. R. Johnson",
      "D. W. Lindle"
    ],
    "categories": [
      "physics.atom-ph"
    ],
    "doi": "10.1103/PhysRevLett.84.2116",
    "title": "Electric-octupole and pure-electric-quadrupole effects in soft-x-ray   photoemission",
    "url": "https://arxiv.org/abs/physics/9908033"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "7ce67001-1656-4f8a-bcd3-3ffc4202fa93",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}