What is Raman spectral mapping ?

Raman spectral imaging (or mapping) is a method for generating detailed chemical images based on a sample’s Raman spectrum.

Raman images (also referred to as maps) visually exhibit variations in spectral information at different points on, or inside, a sample. They may be one-dimensional profiles, two-dimensional images or three-dimensional left volumes. They are a visual way of quickly seeing how parameters change with position, as well as being a powerful, visual means of displaying your information.

  • Raman peak intensity yields images of substance concentration and distribution

 

  • Raman peak position yields images of molecular structure and period, and material stress/strain

 

  • Raman peak width yields images of crystallinity and phase

 

  • A typical experiment uses sequential sample movement and spectrum acquisition, repeated hundreds, thousands or even millions of times, to collect data from the user defined picture area.

 

Raman spectral images can be gathered in two and three dimensions, to yield XY images, XZ and YZ slices, and XYZ datacubes.

Raman spectral imaging is an invaluable technique for scientists in many varied fields, since it allows chemical distribution to be viewed which is invisible by standard optical microscopy. Visit here for info about raman mapping

 

 

You can display a whole range of parameters, from the seriousness of a particular Raman band, or a more complex analysis of the entire spectrum.

 

An explanation of the difference between Raman imaging and mapping. The different procedures for collecting data and creating images, and their advantages and limitations. Find out what technology and specifications you will need to get the best spatial resolution and highest quality results. For more additional info about micro raman spectroscopy checkout online websites.

Blue Scientific is the official Nordic representative for Renishaw Raman and the InVia spectrometer, which is capable of all the methods in this report. If you have any queries or if you’d like a quotation, please get in touch:

Point-by-point mapping

The laser is focuses on a single place, and the sample is moved with a motorised stage. Spectra are acquired sequentially from a array of points, across a specified area of interest. This can be done quickly with Renishaw’s Fast StreamHR™ and StreamHR Rapide technology.

Line focus mapping

Much like point-by-point mapping, but with the laser illuminating a line on the sample, rather than a spot. Spectra can be collected from several places on the sample at exactly the exact same time, so it’s faster. Line focus mapping can be performed with Renishaw StreamLine™ technology.

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