XVIth International Workshop on
Quantum Systems in
Chemistry and Physics
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Experimental investigations of single photon multiple ionization
two examples : formation of HBr3+ and of double core holes
P Lablanquie
LCP-MR, CNRS and University Paris-VI
75231 Paris Cedex 05
FRANCE
Our current research focuses on the experimental investigation of multiple ionization process as induced by single photon interaction. Its first interest is that it results from electron correlations, and can be used to probe them, the second interest is that it gives access to multiply charged species whose properties can be explored in fine detail. We will present two examples from our recent investigations:
-1) HBr3+ species have been formed by double Auger decay of the Br 3d hole [1] Direct and cascade emission of the 2 Auger electrons are used to probe the lower HBr3+ potential curves. They are purely dissociative to H+ + Br2+ limits, but present a peculiar topology due to the residual H + Br3+ binding, as confirmed in our ab initio calculations. [1]
-2) Double core holes have been produced by single photon double ionization. The two K-shell holes can be produced either on the same atom [2] or on neighboring atoms inside the molecule. We will discuss the probabilities for these double ionization paths, and the properties (spectroscopy, Auger decays) of the resulting double core hole states.

[1]. F. Penent et al., Phys. Rev. Lett. 106, 103002 (2011).
[2]. P. Lablanquie et al., Phys. Rev. Lett. 106, 063003 (2011).


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