Journal
JOVE-JOURNAL OF VISUALIZED EXPERIMENTS
Volume -, Issue 140, Pages -Publisher
JOURNAL OF VISUALIZED EXPERIMENTS
DOI: 10.3791/57055
Keywords
Chemistry; Issue 140; Pump-probe experiments; Femtosecond lasers; Free-electron lasers; Jitter correction; Temporal and spatial overlap; Gas-phase molecules; Atomic and molecular physics; Photochemistry
Categories
Funding
- Chemical Sciences, Geosciences, and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy [DE-FG02-86ER13491]
- Helmholtz Gemeinschaft through the Helmholtz Young Investigator Program
- Max Planck Society
- BMBF [05K10KT2, 05K13KT2, 05K16KT3, 05K10KTB, FSP-302]
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This protocol describes key steps in performing and analyzing femtosecond pump-probe experiments that combine a femtosecond optical laser with a free-electron laser. This includes methods to establish the spatial and temporal overlap between the optical and free-electron laser pulses during the experiment, as well as important aspects of the data analysis, such as corrections for arrival time jitter, which are necessary to obtain high-quality pump-probe data sets with the best possible temporal resolution. These methods are demonstrated for an exemplary experiment performed at the FLASH (Free-electron LASer Hamburg) free-electron laser in order to study ultrafast photochemistry in gas-phase molecules by means of velocity map ion imaging. However, most of the strategies are also applicable to similar pump-probe experiments using other targets or other experimental techniques.
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