Eur. Phys. J. D 38, 277-283 (2006)
https://doi.org/10.1140/epjd/e2006-00058-6

Alternate technique for simultaneous measurement of photoionization cross-section of isotopes by TOF mass spectrometer

Atomic and Molecular Physics Laboratory, Department of Physics, Quaid-i-Azam University, Islamabad, Pakistan

Corresponding author: ^a baig@qau.edu.pk

Received: 21 October 2005
Revised: 30 November 2005
Published online: 21 March 2006

Abstract

New measurements of photoionization cross-sections of the lithium isotopes are reported employing a Time of Flight (TOF) mass spectrometer in conjunction with an atomic beam apparatus. Using a two-step selective photoionization and saturation technique, we have simultaneously measured the photoionization cross-section of the 2p excited state of both the isotopes Li⁶ and Li⁷ as 15±2.5 Mb and 18 ±2.5 Mb where as the corresponding number densities have been determined as N₀≈5.3×10¹⁰ atoms/cm³ and N₀≈6.2×10¹¹ atoms/cm³ respectively.