Absolute surface coverage measurement using a vibrational overtone

Andrew C.R. Pipino, Johan P.M. Hoefnagels, Noboru Watanabe

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)


The absolute sub-monolayer surface number densities sensitivity was determined using evanescent-wave cavity ring-down spectroscopy (EW-CRDS) and conventional CRDS. The absolute surface coverages were found from conservation of the integrated band intensities using average molecular tilt angles that were derived from the polarization anisotropies of the adsorbate spectra. The monolayer coverages were probed without the need for ultra-high vacuum as long as the total system intrinsic loss was small. The detection limit achieved using an unclad folded resonator was comparable to that obtained using an optimized planar waveguide with an analyte-enriching surface coating.

Original languageEnglish
Pages (from-to)2879-2888
Number of pages10
JournalJournal of Chemical Physics
Issue number6
Publication statusPublished - 2004 Feb 8


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