The temperature was then increased to 1800 K, chosen as a compromise between having reasonable reactivity toward N2O, without driving fast sublimation. Rbaseline was -193 Da/second at 1800 K ("c"), i.e., the sublimation rate was substantial. Nonetheless, when 2 x 10 -4 Torr of N2O was added, the mass loss rate (slope of M vs. time) fluctuated but the average slope was not dramatically different than the baseline slope at "c" (i.e., Rsublimation) before the N2O was added.