Abstract
The spectroscopic and dynamic features of vibrationally excited water molecules (D 2O) adsorbed on deuterated mordenite zeolite (DM-20) have been observed by infrared-infrared pump-probe experiments. The vibrational lifetimes of D 2O molecules adsorbed on zeolite hydroxyl groups have been determined to be 43 ± 5 ps for the OD group which is rather free from interaction, and ≈ 15ps for the OD group under strong hydrogen bonding to the surface. By infrared pumping, a newly appearing absorption band (≈15ps) was observed at around 2730 cm −1. In basic accordance with the report by Graener and Seifert on a solution of H 2O and D 2O in solvents, a possible assignment of the absorption band is discussed.
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