In this work the sustained enhancement and control of the dissociative ionization (DI) / nondissociative ionization (NDI) ratio in the simplest of all molecules, H2 was demonstrated experimentally for the first time. This increase by about 2 orders of magnitude results in DI probabilities even larger than those for NDI at certain excitation energies, which is a remarkable finding for single photoionization of small molecules. Electron and ion velocity map imaging (VMI) allows for the identification of the DI and NDI mechanisms, and a comparison with ab initio calculations enlightens the dynamics at play within the 100-fs pulse duration.
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Holzmeier Fabian, Bello R Y, Herve Marius, Achner Alexander, Baumann Thomas, Meyer Michael, Finetti Paola, Di Fraia Michele, Gauthier David, Roussel Eleonore Lucie, Plekan Oksana, Richter Robert, Prince Kevin Charles, Callegari Carlo, Bachau H, Palacios A, Martin F, Dowek Danielle
Physical Review Letters 121, 103002 (2018)
doi: 10.1103/PhysRevLett.121.103002
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