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In ion spectroscopy, the positive ions are focussed on the sample at which of the following angles?

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in Analytical Instrumentation by (131k points)
In ion spectroscopy, the positive ions are focussed on the sample at which of the following angles?

(a) 20^o

(b) 30^o

(c) 45^o

(d) 90^o

The question was posed to me in a national level competition.

My doubt is from Instrumentation of Ion Spectroscopy topic in portion Electron and Ion Spectrometers of Analytical Instrumentation

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The correct choice is (c) 45^o

To explain: In ion spectroscopy, the positive ions are focussed on the sample at 45^o. Ions are formed by bombardment.

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