Photoconversion of spiropyran to merocyanine in a monolayer observed using nanosecond pump-probe brewster angle reflectometry

Bernhard Siebenhofer, Sergey Gorelik, Anton V. Sadovoy, Martin J. Lear, Hong Yan Song, Christoph Nowak, Jonathan Hobley

Research output: Contribution to journalArticle

2 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)283-289
Number of pages7
JournalAustralian Journal of Chemistry
Volume65
Issue number3
DOIs
Publication statusPublished - 2012 Mar 28

ASJC Scopus subject areas

  • Chemistry(all)

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