Stokes lines - PowerPoint PPT Presentation

Rotational Spectroscopy

Rotational Spectroscopy. To a stationary observer, a rotating polar molecule looks like an oscillating dipole which can stir the electromagnetic field into oscillation. This picture is the classical origin of the gross selection rule for rotational transitions.

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ω e

ω e. ω e - ω q. ω e + ω q. ← ω q →. ← ω q →. ω →. ω e. ω e - ω q. ω e + ω q. ω →. ω e. Stokes Line. Anti-Stokes Line. ω e - ω q. ω e + ω q. ω →. Generally Weaker. ω e. Stokes Line. Anti-Stokes Line. ω e - ω q. ω e + ω q. ω →.  0 . ω o.

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Virtual state

Virtual state. AB. Sample. Stokes lines. Anti-Stokes lines. D J = ± 1. Rotational Raman:. Sample. Virtual state. D J = ± 1. AB. J. D J = ± 1. J+2. J-2. Rotational Raman:. Sample. Virtual state. D J = ± 1. AB. J. D J = ± 1. Stokes lines. Anti-Stokes lines. J+2.

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231 views • 11 slides

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