Role of screening and angular distributions in resonant x-ray emission of CO

• Resonantly excited carbon and oxygen x-ray-emission spectra of gaseous carbon monoxide are presented. Emission spectra obtained with selective excitation to the pi* valence orbital and to various Rydberg levels are compared to satellite-free nonresonant spectra. Screening effects caused by the excited electron, creating energy shifts and intensity variations in the resonant spectra compared to the nonresonant spectra, are observed, as well as an angular dependence of the resonantly excited spectra. The experimental spectra are compared to simulated spectra where the vibronic part is computed by means of a lifetime-vibrational interference formalism. The electronic intensities are analyzed by a separate-state, self-consistent-held method and a formalism for resonant inelastic x-ray scattering, focusing On screening and angular dependence.

Nyckelord

K-SHELL EXCITATION

HIGH-RESOLUTION

SYNCHROTRON-RADIATION

VIBRATIONAL STRUCTURE

WAVE-FUNCTIONS

SPECTRA

FLUORESCENCE

MOLECULES

SYMMETRY

CARBON

NATURAL SCIENCES

NATURVETENSKAP

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