Colloquium #152 at 4:00 PM on September 27, 2004
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                            Colloquium #152
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         Institute for Plasma Research, Bhat, Gandhinagar
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                         Dr. G. Amarendra
             Indira Gandhi Centre for Atomic Research,
                   Kalpakkam, Tamilnadu, India.

                                on

                Positrons as Novel Probes of Matter

 Positrons  can  provide valuable information on atomistic defects
 in materials. Positron  annihilation  spectroscopy  in  terms  of
 positron  lifetime,  Doppler  broadening  and Angular correlation
 techniques will be discussed. The emergence of variable low ener-
 gy positron beams has enabled non-destructive depth profiling ca-
 pability, thus aiding novel defect characterisation  of  surfaces
 and  interfaces  of  thin  film  structures. Important aspects of
 positron beam construction viz., positron moderators, beam trans-
 port and filtering will be discussed with emphasis on magnetical-
 ly guided IGCAR positron beam.  Selected examples on defect stud-
 ies  in  irradiated  Si,  Pd/Si  junctions and modified stainless
 steel (D9) will be highlighted. Production of  intense  positrons
 using   buffer gas based electrostatic and magnetic trap  will be
 discussed. Preliminary results on  Positronium  production  using
 buffer gases will be presented.


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                       Date:       September 27, 2004 (Monday)
                       Venue:      Seminar Hall
                       Programme:  3:40 PM  : Refreshments
                                   4:00 PM  : Talk
                                   5:00 PM  : Discussion
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