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5. How did reading help Raman? Explain.
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Answer:
Raman spectroscopy, scattered light is detected by a spectrometer to identify the “chemical fingerprint” of the test sample. By using spectral data, a material can be recognized or classified.
The results of a Raman spectroscopy analysis are usually represented graphically, with the intensity of the scattered light (y-axis) plotted against the frequency of light (x-axis). Also considered an indication of energy, frequency is usually measured by a unit known as the wavenumber, which is represented as reciprocal centimetres (cm-1). Frequencies are plotted in relation to that of the laser, since the change in energy of the light is of interest.
A light beam is made up of many waves of light, each with different frequencies all propagating along the same path. Each frequency plays a part in the total intensity of the beam (I), which is represented as photons per time interval. The strength of a light beam is the value that is ultimately assessed with a spectrometer, with the intensity distribution of all detected frequencies known as the beam's spectrum.