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. Author manuscript; available in PMC: 2010 May 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2009 Jan 8;20(5):738–750. doi: 10.1016/j.jasms.2009.01.001

Figure 1.

Figure 1

Illustration of the drift regions of an OMS device. Shown are eight d regions (containing both dt and de sections). Also shown are the field modulation settings for OMS experiments utilizing phase conditions of ϕ = 2, 3, and 4. For the two-phase system, the blue and red traces correspond to voltage settings A and B respectively. For the three-phase system, the blue, red, and green traces correspond with the voltage settings A, B, and C respectively. Finally, for the four-phase system, the blue, red, green, and pink traces correspond with the voltage settings A, B, C, and D.