File Name : figures1_n2-bz2_potential.tif

Caption : fig. s1 intermolecular potential energies of n2/(c6h6)2 for four different orientations. the ab-initio points are calculated by mp2/6-311++g** level of theory. the solid red lines are obtained from the c-n and h-n parameters used in the present simulation.

File Name : figures2_bath.tif

Caption : fig. s2. bath model of c6h6 + c6h6 + 1000 n2 is shown right after preparation (a), and after equilibration (b).

File Name : figures3_asso-prob20-gas.eps

Caption : fig. s3 a comparison between the gas phase and condensed phase association probability versus impact parameter.

File Name : figures4_asso-ensu_t-r-v.eps

Caption : fig. s4 the change in averaged centre-of-mass translational, rotational and vibrational energies of a benzene molecule with respect to the initial values versus time is presented. in panel (a), the change in energy is presented from the initial time till before the formation of the complex, whereas, in panel (b), the calculation is performed from the time of formation of the complex till when the complex last. the result is at 1500 k and b = 4 å.

File Name : figures5_all-ntbyn0.eps

Caption : fig. s5 plot of n(t)/n(0) versus time for the ensuing dissociation and a fit to the eq. (5) for b = 0, 2, 4, 6 å at 1000,1500, and 2000 k in gas phase.

File Name : figures6_ind-ntn0.eps

Caption : fig. s6 plot of n(t)/n(0) versus time for the ensuing dissociation and a fit to the eq. (5) for b = 0, 2, 4, 6 å at 1000,1500, and 2000 k in 20 kg/m3 bath density.

File Name : figures7_com_t-r-v_n2.eps

Caption : fig. s7 the change in average centre-of-mass translational, rotational, and vibrational energy of n2 with time. the calculation is done at 1500 k and with b = 4 å.

File Name : figures8_asso-ensu_b-ave_e.eps

Caption : fig. s8 average total energy of the benzene molecules before complex formation (panel a) and during complex is presented at b = 4 and 6 å. both the results are from 1500 k temperature and 20 kg/m3 bath density.