Paper: CSIR-NET June 2011 · Subject: Physical Chemistry · Chapter: Molecular Spectroscopy · Topic: Molecular Spectroscopy – General · Marks: 2 · Difficulty: Hard
The Stark splitting for a given field is larger for a molecule AX as compared to BX . Which one of the following is true? ( $\mu$ is the dipole moment)
(a)$\mu_{\mathrm{AB}}=\mu_{\mathrm{BX}}$
(b)$\mu_{\mathrm{AB}}>\mu_{\mathrm{BX}}$
(c)$\mu_{\mathrm{AB}}<\mu_{\mathrm{BX}}$
(d)$\mu_{\mathrm{BX}}=2 \mu_{\mathrm{AX}}$
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
The Stark shift of rotational levels grows with the dipole moment (second-order ∝ μ²), so μ_AX > μ_BX.