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Simple Nanosecond to Minutes Transient Absorption Spectrophotometer

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Abstract:

We built a transient absorption spectrophotometer that can determine transient absorption spectral changes that occur at times as fast as ∼200 ns and as slow as a minute. The transient absorption can be induced by a temperature-jump (T-jump) or by optical pumping from the deep ultraviolet (UV) to the infrared (IR) by use of single ns Nd:YAG laser pulses. Our use of a fiber-optic spectrometer coupled to a XeF flashlamp makes the collection of transient spectra easy and convenient in the spectral range from the near IR (1700 nm) down to the deep UV (200 nm), with high signal-to-noise (S/N) ratios. The spectral resolution is determined by the specific configuration of the fiber-optic spectrometer (grating groove density, fiber diameter, slit width) and varies between 0.3 and 10 nm. The utility of this spectrometer was demonstrated by measuring the rate at which a polymerized crystalline colloidal array (PCCA) of poly(N-isopropylacrylamide) nanogel particles optically switch light due to a T-jump induced by nanosecond 1.9 μm laser pulses. In addition, we measured the rate of optical switching induced by a 3 ns 355 nm pump pulse in PCCA functionalized with azobenzene.

Keywords: OPTICAL SWITCHING; PHOTONIC CRYSTALS; PUMP PROBE; TEMPERATURE JUMP; TRANSIENT ABSORPTION; VOLUME-PHASE TRANSITION

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370205775142476

Affiliations: 1: Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 2: Pennsylvania State University, 129K Smith Building, 3000 Ivyside Park, Altoona, Pennsylvania 16601-3760 3: Mylan Pharmaceuticals, 3711 Collins Ferry Road, Morgantown, West Virginia 26505

Publication date: December 1, 2005

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