Phys. Rev. Lett. 95, 166104 (2005) [4 pages]Quasi-Ice Monolayer on Atomically Smooth Amorphous SiO2 at Room Temperature Observed with a High-Finesse Optical ResonatorReceived 4 May 2005; published 13 October 2005 The structure of an H2O monolayer bound to atomically smooth hydroxylated amorphous silica is probed under ambient conditions by near-infrared evanescent-wave cavity ring-down absorption spectroscopy. Employing a miniature monolithic optical resonator, we find sharp (≈10 cm-1) and polarized (>10∶1) vibration-combination bands for surface OH and adsorbed H2O, which reveal ordered species in distinct local environments. Indicating first-monolayer uniqueness, the absorption bands for adsorbed H2O show intensity saturation and line narrowing with completion of one monolayer. Formation of the ordered H2O monolayer likely arises from H bonding to a quasicrystalline surface OH network. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.166104
DOI:
10.1103/PhysRevLett.95.166104
PACS:
82.65.+r, 78.30.−j, 82.45.Mp
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