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Simple nanosecond to minutes transient absorption spectrophotometer

Mikhonin, AV and Maurer, MK and Reese, CE and Asher, SA (2005) Simple nanosecond to minutes transient absorption spectrophotometer. Applied Spectroscopy, 59 (12). 1534 - 1540. ISSN 0003-7028

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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. © 2005 Society for Applied Spectroscopy.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Mikhonin, AV
Maurer, MK
Reese, CE
Asher, SAasher@pitt.eduASHER
Date: 1 December 2005
Date Type: Publication
Journal or Publication Title: Applied Spectroscopy
Volume: 59
Number: 12
Page Range: 1534 - 1540
DOI or Unique Handle: 10.1366/000370205775142476
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 0003-7028
MeSH Headings: Equipment Design; Equipment Failure Analysis; Kinetics; Reproducibility of Results; Sensitivity and Specificity; Spectrophotometry, Atomic--instrumentation; Spectrophotometry, Atomic--methods; Spectrum Analysis, Raman--instrumentation; Spectrum Analysis, Raman--methods; Time Factors
PubMed ID: 16390594
Date Deposited: 08 Feb 2013 21:12
Last Modified: 02 Feb 2019 16:55


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