Enhanced ionization of carbon disulfide–doped heteronuclear clusters in intense laser fields and characterization of the doping level

Abstract

Electron spectra from Arn (n ≤ 24 000) and doped Ar-CS₂ clusters are studied experimentally at laser intensities of about 10¹⁵ W cm⁻². More than an order of magnitude enhancement in the electron yield is observed in the case of doped Ar-CS₂ clusters. The enhancement observed is argued to be because of the presence of species with low ionization potential, CS₂, in the cluster. Similar enhancement is also observed in K-shell emission when comparison is done between pure Ar_n and mixed Ar-(CS₂) clusters under identical experimental conditions of laser irradiation. We also address the effect of doping CS₂ clusters with dopant, Ar, which has higher ionization energy. We demonstrate a simple method for the characterization of doping level based on the Rayleigh scattering measurements.