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. Author manuscript; available in PMC: 2009 May 1.
Published in final edited form as: Anal Chem. 2008 Apr 9;80(9):3492–3497. doi: 10.1021/ac7022734

Scheme 1.

Scheme 1

Schematic of the QSTAR mass spectrometer equipped with a home-built pulsed dual nano-ESI/APCI source. The plots below show the potentials along the instrument axis at different steps for alternating ETD and CID experiments of triply charged tryptic peptide HGTVVLTALGGILK from myoglobin.