Effective doping of low energy ions into superfluid helium droplets Public Deposited

http://ir.library.oregonstate.edu/concern/articles/12579t782

Article Copyright 2015 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

The following article appeared in Journal of Chemical Physics and may be found at  http://scitation.aip.org/content/aip/journal/jcp

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  • We report a facile method of doping cations from an electrospray ionization (ESI) source into superfluid helium droplets. By decelerating and stopping the ion pulse of reserpine and substance P from an ESI source in the path of the droplet beam, about 10⁴ ion-doped droplets (one ion per droplet) can be recorded, corresponding to a pickup efficiency of nearly 1 out of 1000 ions. We attribute the success of this simple approach to the long residence time of the cations in the droplet beam. The resulting size of the doped droplets, on the order of 10⁵/droplet, is measured using deflection and retardation methods. Our method does not require an ion trap in the doping region, which significantly simplifies the experimental setup and procedure for future spectroscopic and diffraction studies.
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  • Zhang, J., Chen, L., Freund, W. M., & Kong, W. (2015). Effective doping of low energy ions into superfluid helium droplets. The Journal of Chemical Physics, 143 (7), 074201. doi:10.1063/1.4928689
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