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The
effect of centrifugal distortion is to destroy the constant separation
of the spectral lines. Separations increase line spacing in one half
of the spectrum and decrease it in the other.
The molecule cannot be a strictly rigid rotor because we know that
molecules vibrate. A better model for representing the rotation of
the molecule is the non-rigid rotor in which two masses are attached
by a massless spring.
Q3.1 What is the centrifugal force on a particle rotating in a
circular path?
Q3.2 In which direction is the force?
Q3.3 How can equilibrium be maintained in the molecule?
Q3.4 How would you expect this to affect the rotational energy levels?
The energy levels of the non-rigid rotor are approximated by the
equation:
F(J) = BJ(J+1) - DJ(J+1) |
(9) |
Q3.5 Derive equations for the positions of the Stokes and
Anti-Stokes lines. |
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