Mass Spectrometer Research page of Gregg Grist (Home Resume' Research Classes Links)


From September 2002 to present I have been a Visiting Fellow at SRI International in Menlo Park.
I have been doing research in the Molecular Physics Lab (MPL) with the Jet-REMPI group.

REMPI (Resonantly Enhanced Multi-Photon Ionization) describes the ionization method for our Time Of Flight (TOF) Mass Spectrometer system that can be used for the detection of a wide variety of compounds in the environment.

The type of inlet to the ionization chamber can vary depending on the sample. For gas phase, or high vapor pressure samples (i.e. samples of air borne compounds), a pulsed valve can be used. This creates a super-sonic jet (hence Jet-REMPI) which cools the sample allowing for a very selective and sensative measurement.

Another type of inlet is the Membrane Induction Mass Spectrometry (MIMS). This is useful for the analysis of compounds that are in water samples.

I have done research with both systems, looking at a variety of compounds. I am currently writting my Thesis based on research that I did with the MIMS-REMPI system.

You can find out a bit more about the REMPI system HERE.

Prior to my joining, the REMPI group did some very important resaerch with Dioxin detection which you can read about HERE.


Updated 30.08.2003