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Proceedings Paper

Serial single molecule electron diffraction imaging: diffraction background of superfluid helium droplets
Author(s): Jie Zhang; Yunteng He; Lei Lei; Maha Alghamdi; Andrew Oswalt; Wei Kong
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Paper Abstract

In an effort to solve the crystallization problem in crystallography, we have been engaged in developing a method termed “serial single molecule electron diffraction imaging” (SS-EDI). The unique features of SS-EDI are superfluid helium droplet cooling and field-induced orientation: together the two features constitute a molecular goniometer. Unfortunately, the helium atoms surrounding the sample molecule also contribute to a diffraction background. In this report, we analyze the properties of a superfluid helium droplet beam and its doping statistics, and demonstrate the feasibility of overcoming the background issue by using the velocity slip phenomenon of a pulsed droplet beam. Electron diffraction profiles and pair correlation functions of ferrocene-monomer-doped droplets and iodine-nanocluster-doped droplets are presented. The timing of the pulsed electron gun and the effective doping efficiency under different dopant pressures can both be controlled for size selection. This work clears any doubt of the effectiveness of superfluid helium droplets in SS-EDI, thereby advancing the effort in demonstrating the “proof-of-concept” one step further.

Paper Details

Date Published: 7 September 2017
PDF: 10 pages
Proc. SPIE 10380, Ultrafast Nonlinear Imaging and Spectroscopy V, 103800F (7 September 2017); doi: 10.1117/12.2273575
Show Author Affiliations
Jie Zhang, Oregon State Univ. (United States)
Yunteng He, Oregon State Univ. (United States)
Lei Lei, Oregon State Univ. (United States)
Maha Alghamdi, Oregon State Univ. (United States)
Andrew Oswalt, Oregon State Univ. (United States)
Wei Kong, Oregon State Univ. (United States)

Published in SPIE Proceedings Vol. 10380:
Ultrafast Nonlinear Imaging and Spectroscopy V
Zhiwen Liu, Editor(s)

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