

Altering
the bond length of any diatomic correspondingly alters its moment
of inertia. The internuclear 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 AntiStokes 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? 