Abstract
The Sensitive, High-Resolution Ion Microprobe (SHRIMP) allows in situ isotopic analyses of solid targets on a microscale.  A primary ion beam of oxygen or cesium is focused onto the surface and erodes the sample with a small fraction of sputtered material becoming ionized.  The analysis of geological materials is complicated by the presence of a wide variety of molecular isobaric interferences which differ only slightly in mass from the atomic species.  Ion microprobes utilize high mass resolution mass spectrometers to enable resolution of interfering species.  The SHRIMP RG, operated on a collaborative basis between Stanford University and the US Geological Survey,  brings unprecedented mass resolving power enabling tasks that have hitherto been very difficult.  Applications of the SHRIMP RG so far include analysis of extraterrestrial materials for evidence of short-lived radionuclides in the solar system, U-Pb geochronology of complexly (age) zoned U bearing minerals, and trace element analyses of materials as varied as otoliths, clay in coal, refractory inclusions in meteorites and other geological materials. Information about the SHRIMP instrument can be found at http://shrimprg.stanford.edu and http://rses.anu.edu.au/rses/Probe/Ion_Probe_website.html web sites.
 

Background
Dr. Trevor Ireland received his Ph.D. from the Australian National University, Canberra, Australia in Isotope Geochemistry in 1987. His thesis title was Isotopic compositions and systematics of refractory inclusions from carbonaceous chondrites. His work has taken him to Otago University, Dunedin, New Zealand; McDonnell Center for the Space Sciences Washington University, St. Louis; Max-Planck Institut für Chemie, Mainz, Germany; The Australian National University, Canberra, Australia; University of California, Los Angeles; and finally, to Stanford University where he currently an Assistant Professor in the Department of Environmental and Geological Sciences and the Director of the SHRIMP facility. His professional interests include chemical and isotopic systematics of refractory inclusions in carbonaceous chondrites, isotopic systematics of interstellar dust, zircon U-Pb geochronology, cosmochronology, geology and geochronology of New Zealand, Antarctica, and Australia.
 
 

Meeting details

Date:	Thursday	November 18, 1999
Time:	6:00 pm	Social hour, registration (Mitchell Building, Stanford University)
	7:00 pm	Dinner ($25, Hartley Conference Room, Mitchell Building)
	8:00 pm	Presentation (free, Skilling Auditorium)
Dinner:	Choice of:	Tender Mushroom-Baked Chicken
		Fresh Salmon
		Vegetarian Baked Eggplant
	includes	Green Salad, Rice,  Cobbler or Pudding Cake, Coffee and tea
Cost:	$25.00	BAMS members.  Reservations required by noon Monday 11/15/99
	$15.00	Students only.  Reservations required by noon Monday 11/15/99

Maps & directions
To: Stanford University
To: Mitchell Building, Skilling Auditorium & parking

 
The San Francisco Bay Area Mass Spectrometry discussion group was formed in 1980 to provide a regular gathering for people interested in mass spectrometry and allied topics. BAMS currently has a membership of about 280 individual and 20 corporate members, and meets 8-10 times per year for a midweek dinner and lecture.  Meetings attract between 30 and 90 people, and are held at a restaurant or hotel in the bay area convenient for our speaker.  We usually convene at 6:00pm for cocktails, dinner at 7:00pm, and lecture at 8:15pm.
 

If you have suggestions for a meeting topic, or know of a prominent mass spectroscopist who will be visiting the bay area, please contact our program chair.
 

As a service to our members, we post Employment postings.

To become a member, please fill out and mail in a membership form.
BAMS has been fortunate to have had many excellent speakers in our short history.
If you have suggestions for a meeting topic please contact our program chair.
If you have questions or comments about BAMS, please contact one of the BAMS officers.
Please thank our corporate sponsors who help keep BAMS membership and dinner costs low.
Here are some internet links that may be of interest to BAMS members.
 

If you have comments or suggestions for this web site, please email me at hugh-gregg@llnl.gov

Last update: 10/22/99.