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Updated: Jun 7, 2026

An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
Published on: October 23, 2018
Femtosecond spectroscopy with vacuum ultraviolet pulse pairs
T K Allison1, T W Wright, A M Stooke
1Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA. tka3@jila.colorado.edu
Abstract:
We combine different wavelengths from an intense high-order harmonics source with variable delay at the focus of a split-mirror interferometer to conduct pump-probe experiments on gas-phase molecules. We report measurements of the time resolution (<44 fs) and spatial profiles (4 μm × 12 μm) at the focus of the apparatus. We demonstrate the utility of this two-color, high-order-harmonic technique by time resolving molecular hydrogen elimination from C(2)H(4) excited into its absorption band at 161 nm.
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