What is a raman spectrometerand how does it work

In practice, Raman spectra are plotted as Raman shift.  Raman shift is the difference between the peak energies and the excitation laser energy.  This allows comparison of a spectrum to other spectra even when different laser excitation energies are used.

Ramanspectroscopy principle and instrumentation PDF

7.3.1. In this example, Raman scattering from liquid water is shown.  What is the wavelength of the laser in nm, and what is the wavelength of Raman scattered light for the major peak of water (as stated in the video?)

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Sylvia-Monique Thomas. Infrared and Raman spectroscopy. (ret. 3/17/2019) https://serc.carleton.edu/NAGTWorkshops/mineralogy/mineral_physics/raman_ir.html

Ramanspectroscopy principle

Concept Check 7.3.2. If a violet laser is passed through a sample of water, do you think the Raman scattered light would still be red, like the example above?  Why or why not? (Hint:If the laser was changed to 364 nm, at what wavelength would the major peak of water appear?)

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Raman spectra are plotted in units of intensity (which can be arbitrary) versus Raman shift in wavenumbers (cm-1).  The Raman shift is used so that data can be easily compared even when different laser wavelengths are used.

What is a raman spectrometerused for

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Ramanspectroscopy instrumentation

The following links show examples of Raman spectra of different materials.  Please look at these examples to compare and contrast the axes of the plots.

7.3.3. In the olivine spectrum, what is the energy difference between the tallest peak and the laser energy, in wavenumbers?

What is a raman spectrometerin chemistry

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Ramanspectroscopy PDF

National University of Ireland, Galway. Small Molecule/Forensics Research. (ret. 3/17/2019) http://www.nuigalway.ie/nanoscale/researchprojects/forensicsraman/

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The x axis of a conventional Raman spectra is plotted in wavenumber (cm-1) units, not in wavelength.  For a review of wavenumbers, see 3.7 Electromagnetic Energy: Units Conversion.

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The counts from the detector are plotted in the y-axis, which is why people report this in different ways.  Peak intensity in reflectance spectra can vary due to experimental conditions, count times, orientation of the sample, surface characteristics, etc.

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