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|Title:||Photoconversion of spiropyran to merocyanine in a monolayer observed using nanosecond pump-probe brewster angle reflectometry|
|Citation:||Siebenhofer, B., Gorelik, S., Sadovoy, A.V., Lear, M.J., Song, H.Y., Nowak, C., Hobley, J. (2012). Photoconversion of spiropyran to merocyanine in a monolayer observed using nanosecond pump-probe brewster angle reflectometry. Australian Journal of Chemistry 65 (3) : 283-289. ScholarBank@NUS Repository. https://doi.org/10.1071/CH12093|
|Abstract:||A new apparatus for nanosecond-time-resolved Brewster angle reflectometry is described that can be used to measure transient angle-resolved reflectivity changes in thin films and monolayers in a single pulsed laser shot. In order to achieve this, a cylindrical lens is placed in the probe beam path replacing the goniometer that is usually used for angular scanning in other systems. Using two synchronized nanosecond pulsed lasers in pump-probe configuration it is possible to measure the kinetics of photoinduced conformational changes by altering the delay between pump and probe pulses. The system was used to observe nanosecond time-resolved photodynamics in a spiropyran monolayer at the air-water interface. After UV excitation the spiropyran converted to its merocyanine form in two stages. The first stage occurred with a timescale close to the instrument time resolution (tens of nanoseconds) whereas the second stage occurred over a few hundred nanoseconds. © 2011 CSIRO.|
|Source Title:||Australian Journal of Chemistry|
|Appears in Collections:||Staff Publications|
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