Supplementary Information File

The supplementary material file contains the 3D model of various Jacobi coordinates along with the Python code to perform Space-Fixed expansion of rigid rotor-rigid rotor collision PES. The file also contains analytically fitted radial terms in MOLSCAT format along with residual plot for PES recreated from these radial terms. Finally, various plots for cross-sections and rate coefficients comparing o- and p-H2 collisional results are also provided in the supplementary material file.