Electron Diffraction of Superfluid Helium Droplets Public Deposited

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  • We present experimental results of electron diffraction of super fluid helium droplets and droplets doped with phthalocyanine gallium chloride, and discuss the possibility of performing the same experiment with a laser aligned sample. The diffraction profile of pure droplets demonstrates dependence on the nozzle temperature, i. e., on the average size of the droplets. Larger clusters demonstrate faster decay with increasing momentum transfer, while smaller clusters converge to isolated gas phase molecules at source temperatures of 18 K and higher. Electron diffraction of doped droplets shows similar modified molecular scattering intensity as that of the corresponding gas phase molecules. Based on fittings of the scattering profile, the number of remaining helium atoms of the doped droplets is estimated to be on the order of hundreds. This result offers guidance in assessing the possibility of electron diffraction from laser aligned molecules doped in superfluid helium droplets.
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  • Zhang, J., He, Y., Freund, W. M., & Kong, W. (2014). Electron Diffraction of Superfluid Helium Droplets. The Journal of Physical Chemistry Letters, 5(11), 1801-1805. doi:10.1021/jz5006829
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