Question

why heavy molecule have closely spaced rotational energy level?
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Answer 1

Answer:

   Home Courses University of California Davis UCD Chem 110B: Physical Chemistry II Text 13: Molecular Spectroscopy

13.2: Rotational Transitions Accompany Vibrational Transitions

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       Jul 12, 2016

       13.1: The Electromagnetic Spectrum

       13.3: The Vibration-Rotation Spectrum

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Each of the modes of vibration of diatomic molecules in the gas phase also contains closely-spaced (1-10 cm-1 difference) energy states attributable to rotational transitions that accompany the vibrational transitions. A molecule’s rotation can be affected by its vibrational transition because there is a change in bond length, so these rotational transitions are expected to occur. Since vibrational energy states are on the order of 1000 cm-1, the rotational energy states can be superimposed upon the vibrational energy states.

Explanation: