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X-ray photoelectron spectroscopy

a surface-sensitive quantitative spectroscopic technique that measures the elemental composition at the parts per thousand range, empirical formula, chemical state and electronic state of the elements that exist within a material.

Pronunciation
/ɛks - reɪ ˌfoʊdoʊəˈlɛktrɑn spɛkˈtrɑskəpi/