Applet Launcher Applet 1 Applet 2 Applet 3 Applet 4 Applet 5 Applet 6   Rotational Raman Spectroscopy The Raman Effect page 2 of 4     Practical Navigator Introduction The Raman Effect Experimental Techniques 1. Rotational Raman Spectroscopy Interpreting the Spectrum Effect of Bond Length Centrifugal Distortion Intensities of Spectral Lines Nuclear Spin Statistics 2. Real Diatomic Molecules Temperature Spectrum of Nitrogen Isotopic Substitution Nuclear Spin Statistics Predict the Spectrum of Oxygen   More diffuse molecular orbitals are more susceptible to polarisation. If a diatomic is rotating at frequency , then using a classical picture we can say that ' its polarisability oscillates with frequency 2' because of symmetry. _ = + sin(22't) (4) _ = = [ + sin(2p2't)] sin(2't) (5) Using the Trigonometric relation: _   sinAsinB = ½ {cos(A - B) - cos(A + B)} (6) _ = sin(2't) + [cos2( - 2') - cos2( + 2') t ] (7)     << previous page www.physchem.ox.ac.uk next page >>