Associative versus dissociative adsorption of water on Al(100)

The adsorption of water on Al (100) at 100 K has been studied using Fourier transform infrared-reflection absorption spectroscopy (FTIR-RAS), nuclear reaction analysis (NRA) and work function measurements (Δφ). All results are consistent with molecular adsorption, as no evidence was found for other possible dissociation products such as atomic O or D (H) at this temperature. By condensing alternating layers of D2O and H2O, it was found that a narrow feature in the v(OD) (v(OH)) region of the spectrum at 2720 cm−1 (3700 cm−1) is associated with non-hydrogen bonded OD (OH) groups in water molecules existing at the ice-vacuum interface. Surface hydroxyl groups resulting from dissociative adsorption exhibit a broader O-D stretch at 2760 cm−1.

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