Exploring Resonance Raman Scattering with 4‑Nitrophenol

Raman scattering is a powerful tool for revealing the vibrations of molecules, but as a nonlinear optical phenomenon, its signals can change via mechanisms like resonance enhancement that have no direct analogue in infrared spectroscopy. In this work, complementary measurements conducted on 4-nitrop...

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Published in:Journal of chemical education 2022-09, Vol.99 (9), p.3233-3241
Main Authors: Jahncke, Catherine L., Zhang, Wenyao, DeMuynck, Bethany M., Hill, Adam D.
Format: Article
Language:English
Subjects:
Analogy (Language change)
College students
Conjugates
Infrared spectroscopy
Lasers
Nitrophenol
NMR
Nonlinear optics
Nuclear magnetic resonance
Optical communication
Raman spectra
Resonance
Resonance scattering
Scattering
Semiconductor lasers
Spectrum analysis
Students
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description Raman scattering is a powerful tool for revealing the vibrations of molecules, but as a nonlinear optical phenomenon, its signals can change via mechanisms like resonance enhancement that have no direct analogue in infrared spectroscopy. In this work, complementary measurements conducted on 4-nitrophenol and its conjugate base allow students to directly control the variables responsible for enhancement. Changing sample UV–vis absorbance with pH and excitation color with the addition of a diode laser allows students to explore the criteria for resonance Raman scattering: only the conjugate base and 405 nm laser in combination produce enhancement. Adjustments to the experiment make it suitable for either an upper-level undergraduate course lab or an independent inquiry project.
doi_str_mv 10.1021/acs.jchemed.2c00210
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source American Chemical Society:Jisc Collections:American Chemical Society Read & Publish Agreement 2022-2024 (Reading list)
subjects Analogy (Language change)
College students
Conjugates
Infrared spectroscopy
Lasers
Nitrophenol
NMR
Nonlinear optics
Nuclear magnetic resonance
Optical communication
Raman spectra
Resonance
Resonance scattering
Scattering
Semiconductor lasers
Spectrum analysis
Students
title Exploring Resonance Raman Scattering with 4‑Nitrophenol
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