Erlangen 2018 – scientific programme

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A: Fachverband Atomphysik

A 25: Poster Session I

A 25.45: Poster

Tuesday, March 6, 2018, 16:15–18:15, Redoutensaal

Two photon double ionization in Neon — •Severin Meister¹, Kirsten Schnorr¹, Sven Augustin¹, Georg Schmid¹, Hannes Lindenblatt¹, Florian Trost¹, Markus Braune², Robert Moshammer¹, and Thomas Pfeifer2¹ — ¹MPIK Heidelberg — ²DESY

The presented experiment unveils the angular correlation of emitted electrons in sequential two-photon double ionization of neon (in a time-resolved manner). In sequential ionization electrons are removed via intermediate ionic states. Even though the atom is first singly ionized and in the following, independent step further ionized by absorbing a second photon, measurements and theory find both electrons to be correlated. The angular distribution of the "first" electron is predicted to depend on the detection angle of the "second" one, which stands in contrast to the simple picture of sequential ionization. This can be quantified by the β₄ anisotropy-parameter which is non-zero for the first electron, under the condition that the second electron was emitted.