Isotherm and infrared induced band of O2 have been studied in the temperature range 93–193 K. At low temperature and low coverage, two components of the fundamental vibrational band appear on both sides of the gas frequency. Their intensities with respect to T and to the number of adsorbed molecules have been measured in order to understand the interaction of O2 with NaA zeolite. The frequency shift of each component has been related to the orientation of the molecule, from considerations about the interaction potential.
The adsorption of two small molecules in porous crystals presenting void volumes of different shapes (cavities of ∼12 Å diameter, channels of ∼6 Å diameter) is measured in a large range of temperatures and pressures. The data analysis shows off the difference in the intermolecular forces between N2 and O2 molecules; in condensed phases the molecule-molecule interaction is repulsive and it is more repulsive for N2. The density of the adsorbed phase is compared with that of the liquid at three temperatures; that points out the confinement effect which is dominant in the channels.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.