Identification of a Previously Unobserved Dissociative Ionization Pathway in Time-Resolved Photospectroscopy of the Deuterium Molecule

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dc.contributor.author Cao, W.
dc.contributor.author Laurent, G.
dc.contributor.author Ben-Itzhak, Itzik
dc.contributor.author Cocke, C. L.
dc.date.accessioned 2016-04-06T15:11:05Z
dc.date.available 2016-04-06T15:11:05Z
dc.identifier.uri http://hdl.handle.net/2097/32349
dc.description Citation: Cao, W., Laurent, G., Ben-Itzhak, I., & Cocke, C. L. (2015). Identification of a Previously Unobserved Dissociative Ionization Pathway in Time-Resolved Photospectroscopy of the Deuterium Molecule. Physical Review Letters, 114(11), 5. doi:10.1103/PhysRevLett.114.113001
dc.description A femtosecond vacuum ultraviolet (VUV) pulse with high spectral resolution (< 200 meV) is selected from the laser-driven high order harmonics. This ultrafast VUV pulse is synchronized with an infrared (IR) laser pulse to study dissociative ionization in deuterium molecules. At a VUV photon energy of 16.95 eV, a previously unobserved bond-breaking pathway is found in which the dissociation direction does not follow the IR polarization. We interpret it as corresponding to molecules predissociating into two separated atoms, one of which is photoionized by the following IR pulse. A time resolved study allows us to determine the lifetime of the intermediate predissociation process to be about 1 ps. Additionally, the dissociative ionization pathways show high sensitivity to the VUV photon energy. As the VUV photon energy is blueshifted to 17.45 eV, the more familiar bond-softening channel is opened to compete with the newly discovered pathway. The interpretation of different pathways is supported by the energy sharing between the electron and nuclei.
dc.relation.uri https://doi.org/10.1103/PhysRevLett.114.113001
dc.rights.uri http://www.sherpa.ac.uk/romeo/issn/0031-9007/
dc.subject Intense Laser Fields
dc.subject Momentum Spectroscopy
dc.subject Electron Localization
dc.subject Recoil-Ion
dc.subject Dynamics
dc.subject Bond
dc.title Identification of a Previously Unobserved Dissociative Ionization Pathway in Time-Resolved Photospectroscopy of the Deuterium Molecule
dc.type Article
dc.date.published 2015
dc.citation.doi 10.1103/PhysRevLett.114.113001
dc.citation.issn 0031-9007
dc.citation.issue 11
dc.citation.jtitle Physical Review Letters
dc.citation.spage 5
dc.citation.volume 114
dc.contributor.authoreid itzik


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