Oak Ridge National Laboratory

Physics Division

Physics Division Seminars

Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,

Alfredo Galindo-Uribarri
Tel (Office): (865) 574-6124  (FAX): (865) 574-1268

Thu., February 12, 2004, at 11:00 a.m. (refreshments served at 10:40 a.m.)

Laser based Techniques in Ultratrace Isotope Research: Production, Spectroscopy and Detection

Klaus Wendt, Institut für Physik, Johannes Gutenberg-Universität,
Building 6008 Conference Room

Due to the multi mega barn cross sections of resonant optical processes and the discriminatory power realized with today's state-of-the-art laser systems, laser based techniques excel in the efficient and selective manipulation of exotic atomic species, in particular if those are available only in minute amounts. Laser induced photo detachment from atoms (i.e. multiple step resonance excitation and ionization) and from negative ions gives unsurpassed suppression of isobaric and isotopic interferences. The techniques are applied on thermal as well as on fast atomic or ionic beams and are ideally suited for combinations with ion traps, buncher and cooler systems or mass spectrometers.
     Approaches for ultra trace determination and atomic spectroscopy of rare natural and anthropogenic exotic species like 3He, 41Ca, 81,85Kr, 90Sr, 135,137Cs, 236U or actinide isotopes, used e.g. in bio-medical, nvironmental and fundamental studies, are very similar to methods required for selective isotope production at on-line facilities like ISOLDE, CERN or ISAC, TRIUMF.
     Physics background, experimental techniques, laser systems and selected results will be discussed in the presentation.

e-mail: Klaus Wendt@uni-mainz.de
Klaus Wendt, Institut für Physik, Johannes Gutenberg-Universität, MAINZ, Germany

Host: Cyrus Baktash (576 7949)