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What technique is more sensitive to isotopic shifts: infrared or microwave spectroscopy? Explain your answer. I...

What technique is more sensitive to isotopic shifts: infrared or microwave spectroscopy? Explain your answer.

I know the answer is IR but I’m not quite sure why.
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Answer #1

with change in the isotop the mass of the atom will change as a result vibrational frequency (IR is the vibrational frequency of the bond) will change. vibrational frequency of a bond is inversley proportional with the square root of reduced mass of the atoms. hence, higher the mass of the isotop lower will be the frequency as a result lower will be the energy of the bond. where as in microwave spectroscopy the responsible factor is the polarity of the bond which does not chenge much with change in the isotop.

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