Question

 The first line in the rotational spectrum of HF molecule is

17 Jul 2026
Answer :
Word Count : 263
The rotational spectrum of the hydrogen fluoride (HF) molecule arises due to transitions between quantized rotational energy levels. Since HF is a heteronuclear diatomic molecule, it possesses a permanent dipole moment, making it active in microwave rotational spectroscopy. The rotational energy levels are given by the expression: [ E_J = B J(J+1) ] where (J) is the rotational quantum number and (B) is the rotational constant. According to the selection rule for pure rotational transitions, [
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