The rotational Raman spectrum of ${ }^{19} \mathrm{F}_{2}$ shows a series of Stokes lines at $19230.769 \mathrm{cm}^{-1}, 19227.238 \mathrm{cm}^{-1}$ and $19223.707 \mathrm{cm}^{-1}$. The rotational constant for ${ }^{19} \mathrm{F}_{2}$ in GHz is:
(a)26.484
(b)52.968
(c)105.936
(d)3.531
Answer
SELF-PRACTICE — the source book printed no answer.
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