Fig. 3
Rotational de-excitation rate coefficients of H2S by collision with He. Upper and lower panels: transitions issued from the 2 2 1 and 2 2 0 initial levels of H2 S, respectively. The rates are compared with the corresponding ones for the H2S+pH2 collisions (designated by pH2) and with those for H2O+He collisions (designated by H2O).
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