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 ( $<44\mathrm{fs}$ ) and spatial profiles ( $4\mathrm{\mu m}\times 12\mathrm{\mu m}$ ) 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 ${\mathrm{C}}_2{\mathrm{H}}_4$ excited into its absorption band at $161\mathrm{nm}$ .

© 2010 Optical Society of America

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