Applet Launcher
Applet 1 Applet 2 Applet 3
Applet 4 Applet 5 Applet 6
  Rotational Raman Spectroscopy
Effect of Bond Length page 1 of 1
Practical Navigator
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
Spectrum of Nitrogen
Isotopic Substitution
Nuclear Spin Statistics
Predict the Spectrum of Oxygen
  Altering the bond length of any diatomic correspondingly alters its moment of inertia. The inter-nuclear distance therefore affects the spectra of different molecules.

Drag the right hand of the two atoms visible in applet 1. Note how the bond length of affects the positions of the energy levels.

Q2.1 Derive the relationship between the bond length and the rotational energy levels.
Q2.2 Record values for one particular Stokes or Anti-Stokes line at a range of bond lengths. Plot an appropriate straight line graph to show demonstrate the relationship between rotational energy level to the bond length.
Q2.3 Does the graph confirm the relationship you derived?
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