Mixed interactions between noble gases

Table I. Values of u°y for Mixed Interactions between Noble Gases (K)...

Oxides are normally stable at the operating temperatures necessary to enhance the interaction between their surface and the gas phase, much more stable compared to organic materials. They are normally operated between 500 and 800 K where the conduction is electronic and oxygen vacancies are doubly ionized. Different oxides have been proposed for conductometric chemical sensors, the most studied is by far tin dioxide that has also been commercialized in form of thick film sensors. Other oxides studied are titanium oxide, tungsten oxide, zinc oxide, indium oxide and iron oxide, first in form of thick and then in form of thin films. Furthermore, the use of mixed oxides, as well as the addition of noble metals, has been studied to improve not only selectivity but also stability. 

Second, is there any interaction between the helium and the fullerene host which would manifest itself in the chemical shifts and to what extent are the latter affected by the mobility of the endohedral noble gas Mixing between the orbitals of the Ceo cage and those of endohedral guests have long been found to be negligible. In the ab initio Hartree—Fock calculations, virtually the same result is obtained for (3(3He)ofHe C6o, 70 and for the chemical shift at the center of the pristine cages. It is only for the... 

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