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. Author manuscript; available in PMC: 2014 Nov 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2013 May 16;24(11):1623–1633. doi: 10.1007/s13361-013-0621-1

Figure 1. Modified LTQ-velos Orbitrap hybrid mass spectrometer.

Figure 1

(A) Schematic of the modified collision cell (multi dissociation cell, MDC) capable of performing ETD which replaced the usual collision cell. (B) Adaptations that allow AI-ETD. In addition to the installation of the MDC, we have excavated a photon passage through the transfer multipole, which conducts anions from the chemical ionization (CI) source to forward sections of the mass spectrometer. Using external mirrors and a ZnSe window, we enable the irradiation of the trapping volume of the MDC with IR photons generated using an external laser.