{
  "annotation_id": "0df4f7ce-7750-465c-a755-76c1c7d33088",
  "date_created": "2026-03-02T18:00:49.909000Z",
  "date_modified": "2026-03-02T18:00:49.909000Z",
  "file_hash": "a78dfd9422477d98b7e26ea6fb79bb41c3eb87e49401f338c44bdd8893df33b5",
  "private": false,
  "record": {
    "abstract": "In order to discern aggregation in solutions, we present a quantum mechanical\nanalog of the photon statistics from fluorescent molecules diffusing through a\nfocused beam. A generating functional is developed to fully describe the\nexperimental physical system as well as the statistics. Histograms of the\nmeasured time delay between photon counts are fit by an analytical solution\ndescribing the static as well as diffusing regimes. To determine empirical\nfitting parameters, fluorescence correlation spectroscopy is used in parallel\nto the photon counting. For expedient analysis, we find that the distribution\u0027s\ndeviation from a single Poisson shows a difference between two single fluor\nmoments or a double fluor aggregate of the same total intensities. Initial\nstudies were performed on fixed-state aggregates limited to dimerization.\nHowever preliminary results on reactive species suggest that the method can be\nused to characterize any aggregating system.",
    "arxiv_id": "physics/0404093",
    "authors": [
      "Hai-cang Ren",
      "Noel L. Goddard",
      "Gregoire Altan-Bonnet",
      "Albert Libchaber"
    ],
    "categories": [
      "physics.bio-ph",
      "cond-mat.soft"
    ],
    "doi": "10.1103/PhysRevE.69.051916",
    "title": "Discerning Aggregation in Homogeneous Ensembles: A General Description   of Photon Counting Spectroscopy in Diffusing Systems",
    "url": "https://arxiv.org/abs/physics/0404093"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "360a4272-2cdf-49f2-87f7-67f9fa542598",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}