WASHINGTON, May 10 (TNSres) -- The U.S. Department of Energy Pacific Northwest National Laboratory issued the following abstract of a journal article: * * * Abstract The accumulation of very large ion populations in traveling wave (TW)-based Structures for Lossless ion Manipulations (SLIM) has been studied to better understand aspects of 'in-SLIM' ion accumulation, and particularly its use in conjunction with ion mobility spectrometry (IMS). A linear SLIM ion path was implemented that had a '  more