

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 NN
gas? Explain your answer. Would you expect NN
to produce a pure rotational spectrum? 