Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 9: Interaction with VUV and X-ray light (FEL) II
A 9.1: Hauptvortrag
Dienstag, 15. März 2011, 10:30–11:00, BAR 205
Ultraintense X-Ray Induced Multiple Ionization and Double Core-Hole Production in Molecules — •Nora Berrah1, Mats Larsson2, Raymond Feifel3, Kiyoshi Ueda4, and Kevin Prince5 — 1Western Michigan University — 2Stokholm University — 3Uppsala University — 4Tohoku University — 5Sincrotron Trieste
We used the world first hard X-ray FEL, the Linac Coherent Light Source (LCLS), to investigate the response of molecular systems to the ultraintense, femtosecond X-ray radiation. We report sequential multiphoton ionization, frustrated absorption and double core hole production mechanisms.
We observed intense X-ray induced ionization and dissociation dynamics leading to various charge states up to fully-stripped fragment ions. By measuring partial ion yields from nitrogen molecules as a function of laser pulse duration (∼ 4 fs - 280 fs), a molecular mechanism of frustrated absorption that suppresses the formation of high charge states at short pulse durations is revealed. Our work will also report on multiple X-ray ionization of molecules and the observation of DCH produced via sequential two-photon absorption on diatomic and triatomic molecules. The production and decay of these states was characterized by using photoelectron spectroscopy and Auger electron spectroscopy.