F. Stephanievictoire et Ec. Delara, ADSORPTION AND COADSORPTION OF MOLECULAR-HYDROGEN ISOTOPES IN ZEOLITES - II - INFRARED ANALYSES OF H-2, HD, AND D-2 IN NAA, The Journal of chemical physics, 109(15), 1998, pp. 6469-6475
The infrared analysis of the induced bands of molecular hydrogen isoto
pes, adsorbed in NaA zeolite, shows several features; (i) when the amo
unt of adsorbed molecules increases, the bands become complex, showing
,three components, which can be related to different energetic situati
on of the molecules in the cavity; (ii) the band frequency is lower th
an the gas frequency; for each species the shifts are proportional to
the inverse square root of the mass (same interaction with the crystal
); (iii) the absolute intensity increases when the temperature decreas
es, this is due to the fact that the molecule remains longer in the vi
cinity of the adsorption site where the electric held is the highest.
Its amplitude is deduced from the absolute intensities measured at the
lowest temperature (similar to 10(10) V/m, in agreement with other re
sults). (C) 1998 American Institute of Physics. [S0021-9606(98)70236-3
].