Ionization and Excitation Cross Section of Alkali Metals by Electron-impact

With merge data available and increasing demand in the various field of study, it has become necessary to know exactly ionization cross section of atoms. A number of models & approximations have already been developed so far for good estimate of ionization cross section; it will further intensify the development of many branches of physics where the use of ionization cross section is very useful. Simple method with easy compilation work may be useful in plasma physics astronomical physics and other field of science and technology which require good estimates of the ionization and excitation cross section for highly excited state.

Some classical theories related to atom excitation had been developed by Thomson and Cryzinski. The theory is known as binary encounter theory, Several works and experiments had been performed with the help of binary encounter theory and other models but its result were failed to explain many aspects. In the mean time Quantum mechanics developed which further boosts up the classical theory. Several theoretical and experimental data are available to compare the results. At present number of quantum mechanical approximations and models have been developed to make easy computation work. The priority is being given to quantum mechanical theories over classical mechanical theories because Quantum mechanical method is easier in various ways.