Volumetric and infrared co-measurements of CH4 and CO isotherms on microporous ice

CH4 and CO adsorption isotherms on microporous ice surfaces have been perfo rmed simultaneously by pressure measurements and infrared spectrometry in t he 50-80 K temperature range in order to compare the two techniques: volume tric isotherms allow evaluation of the surface area of the ice and the net heat of adsorption by the BET model, while infrared spectrometry gives comp lementary information on the nature of the chemical or physical bonding int eraction. Our results show that the two methods are well correlated and tha t their comparison provides valuable information on the different adsorptio n sites. (C) 2000 Elsevier Science B.V. All rights reserved.