Particle induced X- ray emission (PIXE) and Rutherford backscattering spectrometry (RBS) have been used extensively for analytical purpose because of their quantitative accuracy, reliability, simplicity and capability of non- destructive and multielement analysis. When these techniques are combined with a scanning microbeam system and a data acquisition system, three dimensional distribution of elemental composition can be displayed. Samples analyzed so far at Fudan University include a microelectronic circuit and some biological and archaeological samples. The PIXE and RBS spectra and the secondary electron images have been measured.
Based on angular distributions of the proton capture reaction and Weisskopf estimates of ..gamma..-ray transition strengths, the spins of light nuclei are studied. The spin of the 13.321-MeV excited state in /sup 28/Si is deduced to be 2.
