Specific Heat of Diatomic gases (non-rigid)
- A no-rigid diatomic gas has translational, rotational as well as vibrational degrees of freedom.
- There will be 3 translational degrees of freedom and 2 rotational degrees of freedom and 1 vibrational degree of freedom.
- Total contribution by translational= (1/2) kBT, rotational=2x (1/2)kBT and vibrational =kB
- Total Internal energy for 1 mole =(5/2)kBT+kBT = (7/2)kBT= (7/2)RT.
- CV=dU/dT = (7/2) R.
- CP=CV+R= (9/2) R.
- γ= CP/CV =(9/7)
There are two independent axes of rotation(1) and(2) normal to the axis joining the two oxygen molecule.It has 3 translational and 2 rotational degrees of freedom