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Atomic autoionization in the photo-dissociation of super-excited deuterated water molecules fragmenting into D+ + O+ + D.
Iskandar, W; Rescigno, T N; Orel, A E; Larsen, K A; Griffin, B; Call, D; Davis, V; Jochim, B; Severt, T; Williams, J B; Ben-Itzhak, I; Slaughter, D S; Weber, Th.
Afiliación
  • Iskandar W; Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA-94720, USA. TNRescigno@lbl.gov.
  • Rescigno TN; Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA-94720, USA. TNRescigno@lbl.gov.
  • Orel AE; Department of Chemical Engineering, University of California, Davis, CA-95616, USA.
  • Larsen KA; Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA-94720, USA. TNRescigno@lbl.gov.
  • Griffin B; Graduate Group in Applied Science and Technology, University of California, Berkeley, CA-94720, USA.
  • Call D; Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA-94720, USA. TNRescigno@lbl.gov.
  • Davis V; Department of Physics, University of Nevada, Reno, NV-89557, USA.
  • Jochim B; Department of Physics, University of Nevada, Reno, NV-89557, USA.
  • Severt T; Department of Physics, University of Nevada, Reno, NV-89557, USA.
  • Williams JB; J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS-66506, USA.
  • Ben-Itzhak I; J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS-66506, USA.
  • Slaughter DS; Department of Physics, University of Nevada, Reno, NV-89557, USA.
  • Weber T; J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS-66506, USA.
Phys Chem Chem Phys ; 25(32): 21562-21572, 2023 Aug 16.
Article en En | MEDLINE | ID: mdl-37545426
We present the relaxation dynamics of deuterated water molecules via autoionization, initiated by the absorption of a 61 eV photon, producing the very rare D+ + O+ + D breakup channel. We employ the COLd target recoil ion momentum spectroscopy method to measure the 3D momenta of the ionic fragments and emitted electrons from the dissociating molecule in coincidence. We interpret the results using the potential energy surfaces extracted from multi-reference configuration interaction calculations. The measured particle energy distributions can be related to a super-excited monocationic state located above the double ionization threshold of D2O. The autoionized electron energy shows a sharp distribution centered around 0.5 eV, which is a signature of the atomic oxygen autoionization occurring in the direct and sequential dissociation processes of D2O+* at a large internuclear distance. In this way, an O+ radical fragment and a low-energy electron are created, both of which can trigger secondary reactions in their environment.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Chem Chem Phys Asunto de la revista: BIOFISICA / QUIMICA Año: 2023 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Chem Chem Phys Asunto de la revista: BIOFISICA / QUIMICA Año: 2023 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido