Photoionization of He -- a Field Theoretic approach |
| S. Bhattacharyya and S. Mitra Gokhale Memorial Girls' College, Calcutta, India |
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| Received: March 5, 2001; revised version July 10, 2001 |
| The present paper deals with the field theoretic study of single ionization cross-sections σph and σC of helium due to photoelectric effect and the Compton scattering, respectively, by photons of energy lying between 0--12 keV. In this energy range, σph gradually decreases with energy while σC gradually increases. There is a crossover point around 6.5 keV where σph=σC=10-24 cm2. Near about this crossover point σph and σC curves are like mirror images. The ratio σC σph lies between 0.3 to 1.5 in the energy range under consideration. The present results are compared with existing theoretical results. |
| DOI: 10.12693/APhysPolA.100.505 PACS numbers: 32.80.Cy, 32.80.Fb |