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Photoconversion of spiropyran to merocyanine in a monolayer observed using nanosecond pump-probe Brewster angle reflectometry
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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 andmonolayers 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.
Details
- Database :
- OAIster
- Notes :
- application/pdf, Siebenhofer, Bernhard, Gorelik, Sergey, Sadovoy, Anton V., Lear, Martin J., Song, Hong Yan, Nowak, Christoph and Hobley, Jonathan (2012) Photoconversion of spiropyran to merocyanine in a monolayer observed using nanosecond pump-probe Brewster angle reflectometry. Australian Journal of Chemistry, 65 (3). pp. 283-289. ISSN 0004-9425, English
- Publication Type :
- Electronic Resource
- Accession number :
- edsoai.ocn950532935
- Document Type :
- Electronic Resource