Update of a Classic: A Compact Fiber-Optic-Based Laser Luminescence Instrument To Measure Bimolecular Quenching Rate Constants

Mary Sever; Mark A. Young

doi:10.1021/acs.jchemed.4c01200

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Update of a Classic: A Compact Fiber-Optic-Based Laser Luminescence Instrument To Measure Bimolecular Quenching Rate Constants

Journal article

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Update of a Classic: A Compact Fiber-Optic-Based Laser Luminescence Instrument To Measure Bimolecular Quenching Rate Constants

Mary Sever and Mark A. Young

Journal of chemical education, Vol.102(3), pp.1230-1236

03/11/2025

DOI: 10.1021/acs.jchemed.4c01200

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Abstract

We have constructed a compact laser-based spectrometer that confines the laser light to a fiber-optic and is suitable for use in an open undergraduate physical chemistry laboratory. The instrument employs currently available technology and is relatively inexpensive compared to research-grade instruments. Nanosecond time resolution is achieved, and we have successfully utilized the spectrometer for a classic laser experiment to measure the bimolecular quenching rate constant for the photoexcited tris(2,2 '-bipyridyl)ruthenium(II) complex by Fe(III) in aqueous solution using Stern-Volmer analysis. The results are very reproducible with small experimental error and compare well with published values for quenching rate constants of the Ru(II) complex. The experiment exposes students to time-resolved laser measurements that rely on a photochemical kinetic analysis commonly taught as part of the physical chemistry curriculum.

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Details

Title: Subtitle: Update of a Classic: A Compact Fiber-Optic-Based Laser Luminescence Instrument To Measure Bimolecular Quenching Rate Constants
Creators: Mary Sever - Univ Calif San Diego, Dept Chem & Biochem, La Jolla, CA 92037 USA
Mark A. Young - University of Iowa, Chemistry
Resource Type: Journal article
Publication Details: Journal of chemical education, Vol.102(3), pp.1230-1236
DOI: 10.1021/acs.jchemed.4c01200
ISSN: 0021-9584
eISSN: 1938-1328
Publisher: American Chemical Society
Number of pages: 7
Grant note: School of Physical Sciences at the University of California San Diego University of California, San Diego; University of California System Department of Chemistry Biochemistry
Language: English
Date published: 03/11/2025
Academic Unit: Chemistry
Record Identifier: 9984812697702771

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