Q38 · CSIR-NET Chemistry, June 2014
Paper: CSIR-NET June 2014 · Subject: Inorganic Chemistry · Chapter: Inorganic Spectroscopy · Topic: Inorganic Spectroscopy – General · Marks: 2 · Difficulty: Medium
EPR spectrum of a free radical containing nuclei with nonzero nuclear spin is obtained if the following selection rules are observed-
(a)$\Delta \mathrm{m}_{\mathrm{s}}=0, \Delta \mathrm{m}_{\mathrm{l}}=0$
(b)$\Delta m_{s}= \pm 1, \Delta m_{l}=0$
(c)$\Delta m_{s}= \pm 1, \Delta m_{l}= \pm 1$
(d)$\Delta m_{s}=0, \Delta m_{l}= \pm 1$
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
EPR transitions flip the electron spin only: Δm_s = ±1 with Δm_I = 0.
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