期刊
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
卷 48, 期 20, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-4075/48/20/204002
关键词
molecular physics; controlled molecules; alignment; free-electron laser; imaging; coherent diffractive imaging; laser control
资金
- Helmholtz Virtual Institute 'Dynamic Pathways in Multidimensional Landscapes'
- Helmholtz Association 'Initiative and Networking Fund'
- excellence cluster 'The Hamburg Center for Ultrafast Imaging-Structure, Dynamics and Control of Matter at the Atomic Scale' of the Deutsche Forschungsgemeinschaft (CUI) [DFG-EXC1074]
- European Research Council [614507-COMOTION]
- Volkswagen Stiftung
- Office of Basic Energy Sciences, US Department of Energy
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
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 < cos(2) theta(2D)>=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.
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