{
  "id": "1111.6477",
  "version": "v1",
  "published": "2011-11-28T15:38:17.000Z",
  "updated": "2011-11-28T15:38:17.000Z",
  "title": "Production of interstellar hydrogen peroxide (H2O2) on the surface of dust grains",
  "authors": [
    "Fujun Du",
    "Berengere Parise",
    "Per Bergman"
  ],
  "comment": "Accepted for publication in A&A",
  "categories": [
    "astro-ph.GA",
    "physics.chem-ph"
  ],
  "abstract": "Context. The formation of water on the dust grains in the interstellar medium may proceed with hydrogen peroxide (H2O2) as an intermediate. Recently gas-phase H2O2 has been detected in {\\rho} Oph A with an abundance of ~1E-10 relative to H2. Aims. We aim to reproduce the observed abundance of H2O2 and other species detected in {\\rho} Oph A quantitatively. Methods. We make use of a chemical network which includes gas phase reactions as well as processes on the grains; desorption from the grain surface through chemical reaction is also included. We run the model for a range of physical parameters. Results. The abundance of H2O2 can be best reproduced at ~6E5 yr, which is close to the dynamical age of {\\rho} Oph A. The abundances of other species such as H2CO, CH3OH, and O2 can be reasonably reproduced also at this time. In the early time the gas-phase abundance of H2O2 can be much higher than the current detected value. We predict a gas phase abundance of O2H at the same order of magnitude as H2O2, and an abundance of the order 1E-8 for gas phase water in {\\rho} Oph A. A few other species of interest are also discussed. Conclusions. We demonstrate that H2O2 can be produced on the dust grains and released into the gas phase through non-thermal desorption via surface exothermic reactions. The H2O2 molecule on the grain is an important intermediate in the formation of water. The fact that H2O2 is over-produced in the gas phase for a range of physical conditions suggests that its destruction channel in the current gas phase network may be incomplete.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-11-28T15:38:17.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "dust grains",
      "interstellar hydrogen peroxide",
      "current gas phase network",
      "production",
      "gas phase reactions"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1051/0004-6361/201118013",
      "journal": "Astronomy and Astrophysics",
      "year": 2012,
      "month": "Feb",
      "volume": 538
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 963438,
      "adsabs": "2012A&A...538A..91D"
    }
  }
}