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 - 10.1016/j.ijms.2022.116948 UR - https://www.osti.gov/biblio/1895127 ID - 1895127 ER -