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. 2013 Jan 9;5:plt003. doi: 10.1093/aobpla/plt003

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Published by Oxford University Press on behalf of the Annals of Botany Company.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 3 — Schematic view of the PTR-MS instrument. (1) The discharge source for the production of H₃O⁺ ions; (2) the drift tube: the trace gases from the biological sample enter here and a proton transfer takes place with the ions from chamber (1); (3) the buffer chamber; (4) the mass spectrometer with quadrupole; and (5) the secondary electron multiplier.