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. Author manuscript; available in PMC: 2015 Jan 6.
Published in final edited form as: J Am Soc Mass Spectrom. 2011 Feb 12;22(4):607–611. doi: 10.1007/s13361-010-0072-x

Figure 2.

Figure 2

CID product-ion spectra of doubly protonated substance P (m/z = 674): (a) EMS cell, collision gas xenon, collision energy 140 eV; (b) shortened RF quadrupole collision/cooling cell, collision gas N2, collision energy 24 eV.