Click here to view fulltext PDF

Permanent link:
https://www.ias.ac.in/article/fulltext/pram/035/01/0105-0114

Photoionization; inner-shell vacancies; Fluorescent L shell X-rays; angular distribution

The angular dependence of emission intensity of L shell X-rays induced by 59.57 keV photons in Pb and U is investigated by measuring the normalized intensities of the resolved L X-ray peaks at different angles varying from 40° to 120°. It is observed that while L_l and L_α X-ray peaks (originating fromJ = 3/2 state) show some anisotropic angular distribution, the emission of L_β and L_γ X-ray peaks is isotropic. The present results contradict the calculations of Co-oper and Zare (1969) that after photoionization of inner shell, the vacancy state has equal population of magnetic substates and the subsequent X-ray emission is isotropic but confirm the predictions of Fluggeet al (1972) that the atomic inner shell vacancies produced after photoionization are aligned and the x-ray emission from the filling of vacancies in state withJ ⩾ 3/2 is anisotropic.

K S Kahlon¹ K Shatendra^{1 2} K L Allawadhi¹ B S Sood¹

1. Nuclear Science Laboratories, Department of Physics, Punjabi University, Patiala - 147 002, India
2. Solid State Physics Laboratory, Lucknow Road, Delhi - 110 007, India

Published

July 1990

Manuscript received

27 November 1989