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If one selects mass 64 and monitors the peak intensities or the total emission (peak areas) vs. the applied force at fracture (which is proportional to the strength of the sample), one 

FIGURE 8. Typical emission curves on a slow time scale for the common cracking fractions of SO2. 

Our measurements were refined to the point that we also had to consider the finite time of flight from the sample to the ionizer, the velocity distribution of the gas, and the time of flight of the ions created in the ionizer through the mass filter to the detector. Briefly, to obtain unambiguous results it was necessary to measure the gas burst time distributions at two 

FIGURE 9. Peak intensities (a) and total emission (peak areas) (b) vs. applied force at fracture, a measure of sample strength. 

Somewhat surprising is the set of source functions for these gases. Taking the temperature just determined, we can deconvolute the experimentally measured time distributions (taking 

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