Extending HHG Spectroscopy to New Molecular Species
2014
We present technical and experimental advances for performing HHG experiments in a range of substituted benzene molecules
starting in the liquid phase. We demonstrate sub 3% fluctutaions in the harmonic signal generated in a benzene vapour backed
continuous flow gas jet using a mid-IR laser source. The longer drive wavelength is necessary as the target molecules have low
ionization potential and exhibit femtosecond timescale dynamics. We present the acquisition of stable and reproducible harmonic spectra from a range of substituted benzene molecules and the dependence of HHG upon the ellipticity of the laser beam was measured for a number of molecules.
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