REFERENCE TO RELATED APPLICATIONS
This application is a continuation of U.S. application Ser. No. 10/903,497, filed Jul. 30, 2004, now U.S. Pat. No. 7,122,794 which is a continuation-in-part of U.S. application Ser. No. 10/831,646, filed Apr. 23, 2004, now abandoned which is a continuation-in-part of U.S. application Ser. No. 10/321,822, filed Dec. 16, 2002, now U.S. Pat. No. 6,806,463 and of U.S. application Ser. No. 10/082,803, filed Feb. 21, 2002, now U.S. Pat. No. 6,815,669 and of U.S. application Ser. No. 10/462,206, filed Jun. 13, 2003 now U.S. Pat. No. 7,005,632. The U.S. application Ser. No. 10/831,646 claims the benefit of U.S. Provisional Application No. 60/464,977, filed on Apr. 24, 2003, U.S. Provisional Application No. 60/468,306, filed May 6, 2003, U.S. Provisional Application No. 60/483,001, filed on Jun. 27, 2003, U.S. Provisional Application No. 60/491,443, filed on Jul. 31, 2003, and U.S. Provisional Application No. 60/504,024, filed on Sep. 20, 2003. The entire teachings of the above applications are incorporated herein by reference.
A combined rf-only/FAIMS analyzer is disclosed for use in mass spectrometry and other applications. The disclosed apparatus includes a plurality of flat-plate electrodes arranged around a longitudinal axis of the apparatus so as to define generally a parallelogram in a cross section taken in a plane that is normal to the longitudinal axis. FAIMS is removed electronically when not desired by application of radio frequency (rf) waveforms to the flat-plate electrodes.
