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Rev Sci Instrum. 2015 Dec;86(12):125104. doi: 10.1063/1.4936843.

Ceramic micro-injection molded nozzles for serial femtosecond crystallography sample delivery.

The Review of scientific instruments

K R Beyerlein, L Adriano, M Heymann, R Kirian, J Knoška, F Wilde, H N Chapman, S Bajt

Affiliations

  1. Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron, Notkestra?e 85, 22607 Hamburg, Germany.
  2. Photon Science, Deutsches Elektronen-Synchrotron, Notkestra?e 85, 22607 Hamburg, Germany.
  3. Department of Physics, University of Hamburg, Luruper Chaussee 149, 22607 Hamburg, Germany.
  4. Helmholtz-Zentrum Geesthacht, Max-Planck-Straße 1, 21502 Geesthacht, Germany.

PMID: 26724070 DOI: 10.1063/1.4936843

Abstract

Serial femtosecond crystallography (SFX) using X-ray Free-Electron Lasers (XFELs) allows for room temperature protein structure determination without evidence of conventional radiation damage. In this method, a liquid suspension of protein microcrystals can be delivered to the X-ray beam in vacuum as a micro-jet, which replenishes the crystals at a rate that exceeds the current XFEL pulse repetition rate. Gas dynamic virtual nozzles produce the required micrometer-sized streams by the focusing action of a coaxial sheath gas and have been shown to be effective for SFX experiments. Here, we describe the design and characterization of such nozzles assembled from ceramic micro-injection molded outer gas-focusing capillaries. Trends of the emitted jet diameter and jet length as a function of supplied liquid and gas flow rates are measured by a fast imaging system. The observed trends are explained by derived relationships considering choked gas flow and liquid flow conservation. Finally, the performance of these nozzles in a SFX experiment is presented, including an analysis of the observed background.

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