Knowledge Bank

In continuation of our theoretical $efforts1,2$ relating to the (induced) infrared spectrum of solid $H2$, we have treated zero-phonon double transitions in which the multipolar induction proceeds via the anisotropic part of the polarizability of $H2$ - This has led us to develop a general formula for the integrated absorption coefficient of a double transition in which one para molecule undergoes the rovibrational transition $(v\prime =v1,3\prime =\ell )-(v-=0,3-=0)$ and another para molecule the $S(\Delta J=2)$ transition $Sv2\leftarrow o(0)$, following the absorption of a photon. Using this we could estimate the absorption intensities of some W.S type double transitions in solid para $H2$. Details of the theory will be discussed