Infrared experimental proof of the orientation of CH4 adsorbed in NaA zeolite by means of the degeneracy splitting of the ν 3 band, in the temperature range 200-20 K

摘要

The infrared spectrum of methane adsorbed in NaA zeolite changes from 200 K to 20 K. The growth of the ν1 forbidden band and the degeneracy splitting of ν3 give evidence of the electric field in the zeolitic cavity. Below 80 K the molecule trapped in the adsorption site is probably oriented in a C3v configuration in front of a Na + cation.