Applet Launcher
Applet 1 Applet 2 Applet 3
Applet 4 Applet 5 Applet 6
  Rotational Raman Spectroscopy
Spectrum of Nitrogen 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
  Earlier in the practical it was shown that centrifugal distortion breaks down the 2B(3J+2) position of spectral lines. So the rotational constant cannot be calculated as easily as for the rigid rotor model. Bring up Applet 4.

This is the rotational Raman spectrum of gas at 2000K.

Q6.1 Rearrange F(J+2) - F(J) = 2B(2J+3) - 4D(2J+3)(J+3J+3)
into the form y = mx + c, so that m is a function of D only.
Q6.2 By plotting a suitable graph, calculate the values of B and D for .
Q6.3 What is the ortho:para intensity ratio for the spectrum?
Q6.4 What is the nuclear spin of a N nucleus?
Q6.5 How would the spectrum of differ from that of a sample of N-N gas? Explain your answer. Would you expect N-N to produce a pure rotational spectrum?
    << previous page next page >>