Question

49. In the ESR spectrum, the spectrum recorded is in the derivative mode because

A. it is easier to record the spectrum in that mode

B. the width of the peak is too large to record it in the normal mode

C. in the microwave region it is recorded in that way only

D. it is recorded in the IR region

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Answer 1

Answer:

the answer is c in the microwave

Answer 2

In the ESR spectrum, the spectrum recorded is in the derivative mode because C. in the microwave region it is recorded in that way only

Explanation for correct answer

C. in the microwave region it is recorded in that way only

• The absorption spectrum is obtained and inorder to record the first derivative of the absorption. the microwave radiation is modulated
• EPR spectra is recorded as first derivative but  absorption helps to improve the resolution
• To  improve the signal of this small absorption, recording the signal is done either as a first derivative or less commonly as a second derivative curve.

Explanation for incorrect answer

A. it is easier to record the spectrum in that mode-recording of the signal is done either as a first derivative or less commonly as a second derivative curve. and not easier to record.

easier to record

B. the width of the peak is too large to record it in the normal mode

signal of this ESR spectrum is a small absorption peak.

D. it is recorded in the IR region- It is Electron spin resonance (ESR) and not in IR region.