symmetrical dinitrogen tetroxide, ONON0 2 , is to some extent chemically analogous to dinitrogen pentoxide, 02NON0 2. The latter compound can be deposited in covalent form 27,28 from the vapor phase onto a cold (T"'900K) window. It is transformed to the ionic form upon warming to 195°K.27,28 Also, in highly polar solvents it exists in the ionic form. The discussion of the chemical mechanism of formation of nitrosonium nitrate will be presented elsewhere

Filaments have been observed in VO2 coplanar thin-film devices and their I-V characteristic investigated. An analysis of the evolution of the temperature profile in the VO2 film is given.

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