When benzophenone is exposed to ultraviolet radiation, it is excited into a singlet state. This singlet changes rapidly into a triplet, which phosphoresces. Triethylamine acts as a quencher for the triplet. In an experiment in the solvent methanol, the phosphorescence intensity varied with amine concentration as shown below. [Q]/(mol·dm−3) 0.0010 0.0050 0.0100 If/(arbitrary units) 0.41 0.25 0.16 A time-resolved laser spectroscopy experiment had also shown that the half-life of the phosphorescence in the absence of a quencher is 38 µs. What is the value of kQ?
When benzophenone is exposed to ultraviolet radiation, it is excited into a singlet state. This singlet changes rapidly into a triplet, which phosphoresces. Triethylamine acts as a quencher for the triplet. In an experiment in the solvent methanol, the phosphorescence intensity varied with amine concentration as shown below. [Q]/(mol·dm−3) 0.0010 0.0050 0.0100 If/(arbitrary units) 0.41 0.25 0.16 A time-resolved laser spectroscopy experiment had also shown that the half-life of the phosphorescence in the absence of a quencher is 38 µs. What is the value of kQ?
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter20: Molecular Spectroscopy And Photochemistry
Section: Chapter Questions
Problem 6P
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When benzophenone is exposed to ultraviolet radiation, it is excited into a singlet state. This singlet changes rapidly into a triplet, which phosphoresces. Triethylamine acts as a quencher for the triplet. In an experiment in the solvent methanol, the phosphorescence intensity varied with
| [Q]/(mol·dm−3) | 0.0010 | 0.0050 | 0.0100 |
| If/(arbitrary units) | 0.41 | 0.25 | 0.16 |
A time-resolved laser spectroscopy experiment had also shown that the half-life of the phosphorescence in the absence of a quencher is 38 µs. What is the value of kQ?
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