Conclusions

The main conclusions of this work are (1) annealing close to -1000K can enhance the survivability of an amorphous phase within a silicate grain as it will raise its breakdown temperature by strengthening Si02 connectivity; (2) some pre-annealing information may thus survive in the amorphous component of processed grains, even up to relatively high temperatures. This will be relevant to identifying interstellar components among recovered solar system dusts. Analysis of recovered grains that have undergone thermal processing could in principle still reveal information about their pre-processed forms. The next stage of our experiments will be to correlate structural development with spectral development.

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