TY - RPRT TI - Focusing Ions at Atmospheric Pressure using Nonlinear DC Voltage Sequences Applied to a Stacked Ring Ion Guide AU - Hollerbach, Adam L. AU - Ibrahim, Yehia M. AU - Norheim, Randolph V. AU - Metz, Thomas O. AU - Ewing, Robert G. PY - 2022 DO - 10.2172/1986186 UR - https://www.osti.gov/biblio/1986186 ID - 1986186 ER -