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Under ideal conditions, a commercial X-band spectrometer can detect of the order of which of the following number of spins at room temperature?

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Under ideal conditions, a commercial X-band spectrometer can detect of the order of which of the following number of spins at room temperature?

(a) 10^1

(b) 10^5

(c) 10^10

(d) 10^12

I got this question in class test.

My doubt is from Electron Spin Resonance topic in section Electron Spin Resonance Spectrometers of Analytical Instrumentation

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The correct option is (d) 10^12

Easiest explanation: Under ideal conditions, a X-band spectrometer is capable of detecting of the order of 10^12 spins at room temperature. ESR is very sensitive.

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