Generation of Twisted Gamma-Rays via Two-Photon Transition

Abstract

We present a new and efficient method of generating twisted gamma rays utilizing highly accelerated helium-like ions; they are excited to a chosen state by irradiating two optical lasers and emit a photon with orbital angular momentum in the deexcitation process. We study its emission rate together with other properties such as background and photo-ionization processes.

Comments: 20 pages, 11 figures