Effective doping of low energy ions into superfluid helium droplets

Journal Article · Fri Aug 21 04:00:00 EDT 2015 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4928689· OSTI ID:22493539

Zhang, Jie; Chen, Lei; Freund, William M.; Kong, Wei ^[1]

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1. Department of Chemistry, Oregon State University, Corvallis, Oregon 97331 (United States)

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 10{sup 4} 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 10{sup 5}/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.

• OSTI ID: 22493539
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 7 Vol. 143; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CATIONS
DIFFRACTION
DOPED MATERIALS
DROPLETS
EFFICIENCY
HELIUM
IONIZATION
RESERPINE
SUPERFLUIDITY
TRAPS