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ESCA gives sufficient chemical information up to a depth about ________ armstrong in metals.

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ESCA gives sufficient chemical information up to a depth about ________ armstrong in metals.

(a) 5-20

(b) 15-40

(c) 40-100

(d) 100-200

I have been asked this question in homework.

The query is from Electron Spectroscopy for Chemical Analysis topic in portion Electron and Ion Spectrometers of Analytical Instrumentation

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The correct choice is (a) 5-20

To explain I would say: ESCA gives sufficient chemical information up to a depth about 5-20 armstrong in metals. ESCA is also known as X-ray photoelectron spectroscopy.

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