September 2011 Meeting Announcement, Delaware Valley Mass Spectrometry Discussion Group
PLEASE NOTE: We will meet in Mendel 154.
- Topic: "Miniature ion traps for the hand held mass spectrometer"
- Speaker:William Chappell, Purdue University
- Date: Monday, September 12, 2011. 6:30 PM
- Time: Social Hour: 6:30 PM.
Talk: 7:30 PM.
Please RSVP to Eric Manning firstname.lastname@example.org by Thursday September 8th.
- Place: Department of Chemistry, Villanova University (Room 154, Mendel Hall)
Mass spectrometry is highly regarded for its chemical sensitivity and versatility to new applications. Among these broadening applications is in situ mass analysis made possible by the hand held mass spectrometer. One key player in shrinking the mass spectrometer is the miniaturization of the ion trap mass analyzer. Smaller ion trap dimensions allow this electric field based device to operate at only a fraction of the RF drive potential. With low voltage RF, wideband amplifiers allow dynamic waveform modulation, unconstrained by the amplitude only modulation of their bulkier counterparts. Precision fabrication of miniature ion traps is realized through advanced packaging techniques by growing stereo-lithographically defined electrodes onto a predefined circuit board. This novel fabrication technique has provided a means for detecting ions within the ion trap via image current and a platform for parallelization of miniature ion traps into arrays for more complex experiments and greater chemical sensitivity.
William J. Chappell is an Associate Professor in the Department of Electrical and Computer Engineering at Purdue University and a current program manager with DARPA. His research group uses electromagnetic analysis, unique processing of materials, and advanced design to create novel RF and microwave components. His research interests include advanced applications involving the use of tunable filters, RF ion trap based chemical sensors, micro-sized wireless devices, and digital element antenna arrays.
Dr. Chappell coauthored the 2009 best paper for IEEE VT society for wearable antennae and the 2010 Gomac Meritous Paper Award for self-correcting element digital arrays. In 2011 he received the ARL Director’s Coin for his contributions in understanding and mitigating passive intermodulation as part of a MURI. He has also received teaching awards such as the Joel Spira Teaching Excellence Award, and the 2006 Eta Kappa Nu Teacher of the Year Award at Purdue University. He received the BSEE, MSEE, and PhD degrees from the University of Michigan, Ann Arbor, in 1998, 2000, and 2002, respectively.
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