Eur. Phys. J. D 50, 237-240 (2008)
https://doi.org/10.1140/epjd/e2008-00233-9

Calculation of the 1s–2s two-photon excitation cross-section in atomic hydrogen

Department of Physics, Faculty of Arts and Science, Selçuk University, Campus, 42049 Konya, Turkey

Corresponding author: ^a gultekin@selcuk.edu.tr

Received: 26 July 2007
Revised: 25 March 2008
Published online: 5 December 2008

Abstract

The two-photon excitation cross-section of atomic hydrogen is calculated using explicit summation over intermediate states within the framework of dipole approximation. The matrix element for two-photon excitation is transformed into finite sums, consisting of the product of a radial and angular part. Nine intermediate states are employed in the calculation of the transition matrix element. The two-photon excitation cross-section obtained for the transition 1s ²S_1/2–2s ²S_1/2 in atomic hydrogen is a good agreement with the literature.