Electron diffraction self-imaging of molecular fragmentation in two-step double ionization of water |
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Authors: | Sann H Jahnke T Havermeier T Kreidi K Stuck C Meckel M Schöffler M S Neumann N Wallauer R Voss S Czasch A Jagutzki O Weber Th Schmidt-Böcking H Miyabe S Haxton D J Orel A E Rescigno T N Dörner R |
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Institution: | Institut für Kernphysik, J.?W. Goethe Universit?t, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany. |
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Abstract: | We doubly ionize H(2)O by single photon absorption at 43 eV leading to H(+) + OH(+). A direct double ionization and a sequential process in which single ionization is followed by rapid dissociation into a proton and an autoionizing OH(*) are identified. The angular distribution of this delayed autoionization electron shows a preferred emission in the direction of the emitted proton. From this diffraction feature we obtain internuclear distances of 700 to 1100 a.u. at which the autoionization of the OH(*) occurs. The experimental findings are in line with calculations of the excited potential energy surfaces and their lifetimes. |
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