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. Author manuscript; available in PMC: 2014 Jul 28.

Published in final edited form as: J Am Soc Mass Spectrom. 2014 Jan 28;25(4):563–571. doi: 10.1007/s13361-013-0815-6

(a) Nested IMS/MS product ion spectrum of angiotensin I 3⁺. 1.35 MHz, 890 V_p-p main RF; 336 kHz, 8.8 V_p-p applied resonant excitation waveform, applied from time 21–26 ms. (b) Mass spectrum under the same conditions as (a). Known fragment ions are labeled.

(a) Nested IMS/MS product ion spectrum of angiotensin I 3⁺. 1.35 MHz, 890 V_p-p main RF; 336 kHz, 8.8 V_p-p applied resonant excitation waveform, applied from time 21–26 ms. (b) Mass spectrum under the same conditions as (a). Known fragment ions are labeled.