Relations between photoionization cross sections and photon radius

TL;DR

This paper derives relations between photoionization cross sections and photon radius based on quantum mechanics, providing new insights into photon-atom interactions and validating results with experimental data.

Contribution

It introduces a novel relation linking photoionization cross sections to photon radius, enhancing understanding of photon-atom interactions.

Findings

Calculated cross sections agree with experimental data.

Photoionization cross section is smaller than photon ionization cross section.

Cross section can be expressed as photon cross section times electron meeting probability.

Abstract

The relations between photoionization cross sections and photon radius are obtained on basis of quantum mechanics and the particle-like properties of a photon. The photoionization cross sections of H atom and H-like ions, He atom and He like ions, alkali metal atoms, and Rydberg atoms are calculated using the relations. The calculation results are found to be good agreement with the known experimental data. The results show that the photoionization cross section is always smaller than the cross section of the photon to ionize the atom or ion and can be expressed as the product of the cross section of the photon and the probability that electron meets with the photon. These provide the intuitive understanding for the photoionization phenomena and open a new avenue of research on interaction between a photon and an atom or ion.