Photoionization Cross-sections of Alkali Metals: Measurement of Photoionization Cross sections of Excited States of Alkali Metals

Amin, Nasir, Jamil, Yasir, Baig, Muhammad Aslam

ISBN 10: 3659552089 / ISBN 13: 9783659552083

Published by LAP LAMBERT Academic Publishing, 2014

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Bibliographic Details

• Title: Photoionization Cross-sections of Alkali Metals: Measurement of Photoionization Cross sections of Excited States of Alkali Metals
• Publisher: LAP LAMBERT Academic Publishing
• Publication Date: 2014
• Language: English
• ISBN 10: 3659552089
• ISBN 13: 9783659552083
• Binding: paperback
• Condition: New
• Book Type: book

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Synopsis

Laser photoionization spectroscopy is based on the resonance ionization of atoms and molecules as a result of successive absorption of several laser photons. Photoionization cross sections have number of utilities in the applied areas of science and technology such as space and astrophysics, radiation protections, laser designing and interaction of electromagnetic radiation with matter. The atoms whose ionization potentials are much higher can be ionized by two-photon and multi-step excitation. The absolute photoionization cross sections of the excited states of lithium, sodium and potassium were measured using the saturation technique in conjunction with a thermionic diode ion detector at different ionizing wavelengths above the first ionization threshold. In general it has been found that the measured values of cross sections from the first resonance states to the ionization threshold decreases with the increase of atomic number (Li > Na > K). The smooth frequency dependence of the cross section is observed above the ionization threshold for the excited states of alkali metals.

About the Author

Prof. Dr. Nasir Amin,Chairman,Department of Physics, GCU Faisalabad Pakistan,got doctoral degree in Laser Spectroscopy from Quaid i Azam University Islamabad, Pakistan. He worked as Post Doc fellow at the University of California, San Diego, USA.He got PAS gold medal that reflects his high quality research work in laser spectroscopy.