Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/95490
Title: Quantification of transient absorption in photo-reactive monolayers using reflectometry in the vicinity of brewster angle
Authors: Gorelik, S.
Hobley, J.
Lear, M.J. 
Song, H. 
Yong, S.Y.S.
Cheng, J.
Keywords: Brewster angle
Monolayer
Photochemistry
Reflection
Transient absorption
Issue Date: Feb-2009
Source: Gorelik, S.,Hobley, J.,Lear, M.J.,Song, H.,Yong, S.Y.S.,Cheng, J. (2009-02). Quantification of transient absorption in photo-reactive monolayers using reflectometry in the vicinity of brewster angle. International Journal of Nanoscience 8 (1-2) : 213-218. ScholarBank@NUS Repository.
Abstract: A method is presented that enables the determination of transient absorption in Langmuir films made from a monolayer of spiropyran on water. This is achievable even though the optical pathlength of such a monolayer is < 10-9 m. The approach is to monitor reflectivity changes close to the Brewster angle, where the background of reflected light is minimized. This is the key to the sensitivity of the method. Relatively speaking the small changes in reflectivity due to changes in both real and imaginary parts of the refractive index are easier to observe with the intrinsically low backgrounds at the Brewster angle. Notably using Fresnel equations we can show that the real and imaginary parts of the refractive index can be independently assessed for ultrathin films and monolayers using the approach presented. © 2009 World Scientific Publishing Company.
Source Title: International Journal of Nanoscience
URI: http://scholarbank.nus.edu.sg/handle/10635/95490
ISSN: 0219581X
Appears in Collections:Staff Publications

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