Key points are not available for this paper at this time.
In the theory of the specific heats of gases of diatomic molecules the function plays a well-known and important part. The rotational specific heat C rot of a diatomic molecule, which is susceptible of representation as a rigid body with two equal principal moments of inertia, without spin about the other principal axis, is given by where R is the gram-molecular gas-constant and the pair of equal moments of inertia being equal to A . Whether such a model is or is not an adequate representation is a matter for determination by a detailed study of the structure of the band spectrum, particularly of the nature of the normal electronic and vibrational state. It is known to be applicable to normal molecules of the halogen hydrides, to CO and other molecules which have a normal state of type 1 S including (but for a certain special feature) H 2 .
H. Mulholland (Sun,) studied this question.