| Recap |
| In this lecture you have learnt the following |
| 13.8 |
Summary |
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In the present lecture, we have explored some of the main features of rotational and vibrational spectroscopy. The quantization of both these energy levels was outlined. The selection rules are ΔJ = ±1 and Δv = 1,2,3… Rotational Spectroscopy gives the values of rotational constants B, using which bond lengths can be calculated. Introduction of non-rigidity in a rotor or anharmonicity in a harmonic oscillator leads to the bunching of higher energy levels. The rotational vibrational spectra of polyatomics give rise to the P, Q and R branches. Vibrations of polyatomics can be conveniently studied in terms of the 3N-6 normal modes. In complex molecules, different groups absorb at different characteristic frequencies and these frequencies (Table 13.2) can be used to identify groups in molecules. Thus IR spectra are very useful in qualitative and quantitative analysis. |
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