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Interactions of gaseous molecules with X-ray photons and photoelectrons in AP-XPS study of solid surface in gas phase

Abstract

Studies of surface of a catalyst in gas phase with photoelectron spectroscopy is an important approach to establish correlation between surface of a catalyst under a reaction condition or during catalysis and its corresponding catalytic performance. Different from the well understood interactions between photoelectrons and atomic layers of a solid surface in ultrahigh vacuum (UHV) and the well-developed method of quantitative analysis of a solid surface in UHV, a fundamental understanding of the interactions between X-ray photons and gaseous molecules and between photoelectrons and molecules in a gas phase is lacking. Through well designed experiments of ambient pressure X-ray photoelectron spectroscopy (AP-XPS), the impact of the interactions between photoelectrons and gaseous molecules and interactions between X-ray photons and gaseous molecules on intensity of the collected photoelectrons were explored. How the changes of photoelectron intensity resulting from these interactions influence the measurement of authentic atomic ratio of element M to A of a solid surface was discussed. Methods to correct the measured nominal atomic ratio of two elements of a solid surface upon travelling through a gas phase to its authentic atomic ratio were developed.

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Publication details

The article was received on 17 Dec 2017, accepted on 30 Jan 2018 and first published on 30 Jan 2018


Article type: Paper
DOI: 10.1039/C7CP08429C
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Interactions of gaseous molecules with X-ray photons and photoelectrons in AP-XPS study of solid surface in gas phase

    F. (. Tao and L. Nguyen, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C7CP08429C

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