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19 April 2024

» arxiv » 1506.3650

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Strongly aligned gas-phase molecules at Free-Electron Lasers
Thomas Kierspel ; Joss Wiese ; Terry Mullins ; Joseph Robinson ; Andy Aquila ; Anton Barty ; Richard Bean ; Rebecca Boll ; Sébastien Boutet ; Philip Bucksbaum ; Henry N. Chapman ; Lauge Christensen ; Alan Fry ; Mark Hunter ; Jason E. Koglin ; Mengning Liang ; Valerio Mariani ; Andrew Morgan ; Adi Natan ; Vladimir Petrovic ; Daniel Rolles ; Artem Rudenko ; Kirsten Schnorr ; Henrik Stapelfeldt ; Stephan Stern ; Jan Thøgersen ; Chun Hong Yoon ; Fenglin Wang ; Sebastian Trippel ; Jochen Küpper ;
Date:	11 Jun 2015
Abstract:	We demonstrate a novel experimental implementation to strongly align molecules at full repetition rates of free-electron lasers. We utilized the available in-house laser system at the coherent x-ray imaging beamline at the Linac Coherent Light Source. Chirped laser pulses, i. e., the direct output from the regenerative amplifier of the Ti:Sa chirped pulse amplification laser system, were used to strongly align 2,5-diiodothiophene molecules in a molecular beam. The alignment laser pulses had pulse energies of a few mJ and a pulse duration of 94 ps. A degree of alignment of $left<cos^2! heta_{2D} ight>$ = 0.85 was measured, limited by the intrinsic temperature of the molecular beam rather than by the available laser system. With the general availability of synchronized chirped-pulse-amplified near-infrared laser systems at short-wavelength laser facilities, our approach allows for the universal preparation of molecules tightly fixed in space for experiments with x-ray pulses.
Source:	arXiv, 1506.3650
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