7.5 Parts of a Raman Spectrometer

Learning Objectives

  • Describe the key parts of a Raman spectrometer
  • Describe the purpose of each part of a Raman spectrometer

Prior Knowledge and Skills

7.2 History of Raman Spectroscopy

Key Terms

  • Interference or dichroic filter
  • Notch filter or edge filter
  • Detector

Guided Inquiry

General Overview:

Look at the schematic diagram of a Raman spectrometer on this page:

Horiba Scientific. What hardware is required for a Raman spectrometer? (ret. 3/17/2019) http://www.horiba.com/uk/scientific/products/raman-spectroscopy/raman-academy/raman-faqs/hardware-required/

7.5.1 Descriptive scheme of the main components of a Raman microspectrometer.  From Figure 4 in Bonales et al. 2016.

7.5.1 What parts are found in all Raman spectrometers? See the references below for help defining parts.

7.5.2 What is the purpose of a notch filter? See the references below.

The JMU Raman Spectrometer:
Watch: Raman: Parts of the Raman Spectrometer https://youtu.be/9THvX1ik640

This is a diagram with the parts of the Ocean Optics IDRaman Micro labelled:

For comparison, here are images of research-grade Raman spectrometers in Virginia Tech Geosciences Fluids Research group: https://www.geochem.geos.vt.edu/fluids/raman/

7.5.3 Why does the Ocean Optics Raman have a non-laser LED light?

Summary

Raman spectrometers are all built around the principles that C.V. Raman developed and have some common parts necessary to function.  However, many different configurations exist depending upon use, and these configurations may require additional optics and parts.

References

AMiGEO. Raman: Parts of the Raman Spectrometer (Apr 30, 2018) https://youtu.be/9THvX1ik640

Laura J. Bonales, Jone M. Elorrieta, Álvaro Lobato and Joaquin Cobos (October 5th 2016). Raman Spectroscopy, a Useful Tool to Study Nuclear Materials, Applications of Molecular Spectroscopy to Current Research in the Chemical and Biological Sciences, Mark T. Stauffer, IntechOpen, DOI: 10.5772/64436. Available from: https://www.intechopen.com/books/applications-of-molecular-spectroscopy-to-current-research-in-the-chemical-and-biological-sciences/raman-spectroscopy-a-useful-tool-to-study-nuclear-materials.

Horiba Scientific. What hardware is required for a Raman spectrometer? (ret. 3/17/2019) http://www.horiba.com/uk/scientific/products/raman-spectroscopy/raman-academy/raman-faqs/hardware-required/

Interference or dichroic filter: https://en.wikipedia.org/wiki/Interference_filter

Neutral Density or ND filter: https://en.wikipedia.org/wiki/Neutral-density_filter

Notch or band-stop filter: https://en.wikipedia.org/wiki/Band-stop_filter

SEMROCK. Edge Filters vs. Notch Filters for Raman Instrumentation. (ret. 3/17/2019)  https://www.semrock.com/edge-filters-vs-notch-filters-for-raman-instrumentation.aspx