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Author He, Yunteng ♦ Zhang, Jie ♦ Kong, Wei
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ♦ CLUSTER BEAMS ♦ DOPED MATERIALS ♦ DROPLETS ♦ ELECTRON DIFFRACTION ♦ EXPERIMENTAL DATA ♦ HELIUM ♦ MOLECULES ♦ SUPERFLUIDITY
Abstract We demonstrate the practicality of electron diffraction of single molecules inside superfluid helium droplets using CBr{sub 4} as a testing case. By reducing the background from pure undoped droplets via multiple doping, with small corrections for dimers and trimers, clearly resolved diffraction rings of CBr{sub 4} similar to those of gas phase molecules can be observed. The experimental data from CBr{sub 4} doped droplets are in agreement with both theoretical calculations and with experimental results of gaseous species. The abundance of monomers and clusters in the droplet beam also qualitatively agrees with the Poisson statistics. Possible extensions of this approach to macromolecular ions will also be discussed. This result marks the first step in building a molecular goniometer using superfluid helium droplet cooling and field induced orientation. The superior cooling effect of helium droplets is ideal for field induced orientation, but the diffraction background from helium is a concern. This work addresses this background issue and identifies a possible solution. Accumulation of diffraction images only becomes meaningful when all images are produced from molecules oriented in the same direction, and hence a molecular goniometer is a crucial technology for serial diffraction of single molecules.
ISSN 00219606
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-07-21
Publisher Place United States
Journal Journal of Chemical Physics
Volume Number 145
Issue Number 3


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