Quantification of transient absorption in photo-reactive monolayers using reflectometry in the vicinity of Brewster angle

Gorelik, Sergey and Hobley, Jonathan and Lear, Martin J. and Song, Hongyan and Yong, Stanley Yew Siong and Cheng, Jianhua (2009) Quantification of transient absorption in photo-reactive monolayers using reflectometry in the vicinity of Brewster angle. International Journal of Nanoscience, 08 (01/02). pp. 213-218. ISSN 0219-581X

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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.

Keywords:Monolayer, Photochemistry, Transient absorption, Brewster angle microscopy
Subjects:F Physical Sciences > F170 Physical Chemistry
F Physical Sciences > F180 Analytical Chemistry
Divisions:College of Science > School of Chemistry
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ID Code:17137
Deposited On:23 Apr 2015 10:15

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