References and Articles for Ion Conductance: Ion Selective Apertures (ISA), APF, Laminated APF, and Laminated Tubes and Apertures
"Remote reagent ion generator" by Timothy P Karpetsky, John C Berends, Edward W Sheehand, Ross C Willoughby (US Patent 7,569,812, August 4, 2009).
"Coupling atmospheric pressure optics with field-free ionization sources" by Edward Sheehan, Ross Willoughby, David Fries (ASMS 2009, abstract).
"Field-free atmospheric ionization: Atmospheric pressure chemical ionization & electrospray" by Edward W. Sheehan1, Ross C. Willoughby, Robert Classon, Dan Dodgen (ASMS 2008, poster).
"Remote reagent chemcial ionization source" by Edward W Sheehand, Ross C Willoughby (US Patent 7,253,406, August 7, 2007).
"Remote reagent chemcial ionization source" by Edward W Sheehand, Ross C Willoughby (US Patent 7,095,019, August 22, 2006).
"Remote reagent chemcial ionization source" by Edward W Sheehand, Ross C Willoughby (US Patent 6,888,132, May 3 2005).