H 2 O‐H 2 O Collision Rate Coefficients

H 2 O-H 2 O collision cross sections are calculated by adapting the method developed by Anderson and Tsao and Cornette for the calculation of collision broadening of molecular spectral lines. Cross sections are computed with a cutoff limit at 20 Å 2 for the rotational levels of water with J ≤ 10 and E < 2000 cm -1 in the temperature range 100-800 K. The accuracy of the calculated values is estimated to be 10%-20%.