Abstract
Dichroism in angle-resolved spectra of circularly polarized fluorescence from freely-rotating CO molecules was studied experimentally and theoretically. For this purpose, carbon monoxide in the gas phase was exposed to circularly polarized soft X-ray synchrotron radiation. The photon energy was tuned across the C 1s→π* resonant excitation, which decayed via the participator Auger transition into the CO+ A 2Π state. The dichroic parameter β1 of the subsequent CO+ (A 2Π → X 2Σ+) visible fluorescence was measured by photon-induced fluorescence spectroscopy. Present experimental results are explained with the ab initio electronic structure and dynamics calculations performed by the single center method. Our results confirm the possibility to perform partial wave analysis of the emitted photoelectrons in closed-shell molecules.
Highlights
IntroductionOne-photon ionization of atoms and relatively small molecules by extreme ultraviolet and soft X-ray radiation can be described within the electric dipole approximation (see, e.g., Reference [1])
To a large extent, one-photon ionization of atoms and relatively small molecules by extreme ultraviolet and soft X-ray radiation can be described within the electric dipole approximation
We report a joint experimental and theoretical study of circular dichroism in the CO+ (A → X) fluorescence spectra by measuring and computing the dichroic parameter β1
Summary
One-photon ionization of atoms and relatively small molecules by extreme ultraviolet and soft X-ray radiation can be described within the electric dipole approximation (see, e.g., Reference [1]). It assumes, that the incoming photon γ carries angular momentum of. The transfer of the angular momentum and helicity of the ionizing photon to a target system results in two phenomena. It is responsible for the unique angular emission distribution of photoelectrons, which is an inherent property of a target.
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