Surface heterogeneity and inhomogeneous broadening of vibrational line profiles

Skandar Taj, Diane Baird, Alexander Rosu-Finsen, Martin R. S. McCoustra

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11 Citations (Scopus)
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The surface heterogeneity of amorphous silica (aSiO2) has been probed using coverage dependent temperature programmed desorption (TPD) of a simple probe molecule, carbon monoxide (CO). The resulting distribution of interaction energies is the foundation from which an environmentally broadened vibrational line profile synthesis has been undertaken. These simulations are compared with measured line profiles recorded at 0.1 cm-1 resolution using reflection-absorption infrared spectroscopy (RAIRS). A comparison of such line profile synthesis for CO on amorphous silica and on porous amorphous solid water (p-ASW) is also reported and conclusions are drawn as to the vibrational relaxation and surface dynamics of the CO molecule on the two surfaces.
Original languageEnglish
Pages (from-to)7990-7995
Number of pages6
JournalPhysical Chemistry Chemical Physics
Issue number11
Early online date1 Mar 2017
Publication statusPublished - 21 Mar 2017


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