Cars spectrum of O2− formed by the trapping of photo-generated electrons on a ZnO surface

✍ Scribed by W.M Hetherington III; E.W Koeing; W.M.K.P Wijekoon

• Publisher: Elsevier Science
• Year: 1987
• Tongue: English
• Weight: 531 KB
• Volume: 134
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(87)87122-1

✦ Synopsis

Using the planar optical waveguide geometry, two-photon absorption in ZnO generates electrons which are trapped by physisorbed Oz. The CARS spectrum of transient 02 on a ZnO surface indicates the presence of at least three bound species with vibrational frequencies of 112 1, 1133 and 1142 cm-'. The required CARS sensitivity in a UHV environment was achieved by establishing an interference condition within a ZnO waveguide to eliminate the contribution from the non-resonant susceptibility of the ZnO.