{
  "abstract": "We study gas-phase dissociation of the formic acid dimer dication as a model for DNA base-pair interactions after inner-valence 56 eV extreme ultraviolet (EUV) ionization. Employing reaction microscopy, we measure the 3D momenta of electrons and fragment-ions in coincidence to reconstruct channel-resolved electron kinetic energies, fragment kinetic energy release, and angular distributions. This work focuses on the symmetric 2-body (HCOOH+ + HCOOH+) and asymmetric 3-body (HCOOH+ + HCOO+ + H) breakup channels, reporting their relative yields and dynamics. Electron-energy signatures and angular correlations distinguish direct double ionization (DDI) from sequential ionization (SI) with a ratio of ∼9:5. In SI, low-energy electrons and their near-isotropic angular distributions indicate a competition between local intramolecular autoionization (AI) and nonlocal intermolecular Coulombic decay (ICD). Real-time simulations of the electron dynamics support AI/ICD-driven secondary ionization on sub-20 fs time scales. The SI process depends on whether the initially ionized orbital has carbonyl- or hydroxyl-oxygen character, with charge and energy transfer occurring between diagonally adjacent oxygen atoms rather than along hydrogen bonds.",
  "abstract_shown": true,
  "affiliations": [
    "School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia30332, United States.",
    "Department of Chemistry, Tamkang University, Tamsui, New Taipei City251301, Taiwan.",
    "Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California94720, United States.",
    "Institut für Kernphysik, Goethe-Universität, 60438Frankfurt am Main, Germany.",
    "J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas66506, United States.",
    "Department of Physics, University of Nevada, Reno, Nevada89557, United States.",
    "School of Physics, Georgia Institute of Technology, Atlanta, Georgia30332, United States."
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 20,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "J X Zhong Manis",
      "orcid": "0000-0002-0186-2468"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Y S Wang"
    },
    {
      "affs": [
        0
      ],
      "name": "M C Rohan",
      "orcid": "0009-0001-3582-5948"
    },
    {
      "affs": [
        2
      ],
      "name": "S Kumar",
      "orcid": "0000-0002-1996-9925"
    },
    {
      "affs": [
        2
      ],
      "name": "M Shaikh"
    },
    {
      "affs": [
        3
      ],
      "name": "J Stindl",
      "orcid": "0000-0002-5041-2404"
    },
    {
      "affs": [
        3
      ],
      "name": "G Kastirke"
    },
    {
      "affs": [
        3
      ],
      "name": "O D McGinnis"
    },
    {
      "affs": [
        3
      ],
      "name": "M Kircher"
    },
    {
      "affs": [
        4
      ],
      "name": "C Bagdia"
    },
    {
      "affs": [
        4
      ],
      "name": "N Iwamoto"
    },
    {
      "affs": [
        5
      ],
      "name": "R Enoki",
      "orcid": "0009-0009-4824-5852"
    },
    {
      "affs": [
        5
      ],
      "name": "V Davis"
    },
    {
      "affs": [
        5
      ],
      "name": "J B Williams"
    },
    {
      "affs": [
        3
      ],
      "name": "R Dörner"
    },
    {
      "affs": [
        4
      ],
      "name": "I Ben-Itzhak",
      "orcid": "0000-0002-6214-3520"
    },
    {
      "affs": [
        2
      ],
      "name": "D S Slaughter",
      "orcid": "0000-0002-4621-4552"
    },
    {
      "affs": [
        2
      ],
      "name": "T Weber"
    },
    {
      "affs": [
        0
      ],
      "name": "J S Kretchmer",
      "orcid": "0000-0003-3468-0481"
    },
    {
      "affs": [
        0,
        6
      ],
      "name": "T M Orlando",
      "orcid": "0000-0002-2422-4506"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1q2179yv6z7g7.bib",
  "cited_by": 0,
  "doi": "10.1021/acs.jpclett.6c03064",
  "fulltext_url": "https://europepmc.org/articles/PMC13679088",
  "id": "1q2179yv6z7g7",
  "issns": [
    "1948-7185"
  ],
  "landing_url": "https://europepmc.org/article/MED/42918232",
  "language": "eng",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3107|Atomic and Molecular Physics"
    ]
  ],
  "openalex": "W7220425556",
  "pdf_url": "https://europepmc.org/articles/PMC13679088?pdf=render",
  "pmcid": "PMC13679088",
  "pmid": "42918232",
  "published": "2026-10-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/1q2179yv6z7g7.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:20:36Z",
      "native_id": "MED:42918232",
      "source": "europepmc",
      "url": "https://europepmc.org/article/MED/42918232"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "openalex:3107|Atomic and Molecular Physics",
      "subfield": "amo"
    }
  ],
  "title": "Dynamics and Energy Relaxation of Formic Acid Dimers Following Inner Valence Ionization.",
  "title_text": "Dynamics and Energy Relaxation of Formic Acid Dimers Following Inner Valence Ionization.",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:20:36Z",
  "url": "https://research.draconitic.com/paper/1q2179yv6z7g7",
  "venue": "The journal of physical chemistry letters",
  "versions": []
}