Voimaspektroskopiaan

Voimaspektroskopia, also known as Raman spectroscopy, is an analytical technique used to identify chemical compounds and study molecular vibrations. It relies on the Raman effect, a phenomenon where light scattered by a sample undergoes a frequency shift. This shift is characteristic of the vibrational modes of the molecules within the sample. When a laser beam illuminates a material, most of the light is scattered elastically (Rayleigh scattering) with no change in energy. However, a small fraction of the light is scattered inelastically, meaning it gains or loses energy. This energy exchange occurs when the incident photons interact with the vibrational modes of the molecules. The energy difference between the incident and scattered photons corresponds to the vibrational energy of the molecule.

The resulting spectrum, a plot of scattered light intensity versus the frequency shift (Raman shift), provides a unique fingerprint for each chemical substance. This fingerprint can be used for qualitative analysis, identifying unknown substances by comparing their spectra to known databases. Furthermore, the intensity of the Raman signal is proportional to the concentration of the analyte, allowing for quantitative analysis. Voimaspektroskopia is a non-destructive technique and can be performed on samples in various states, including solids, liquids, and gases, often without extensive sample preparation. Its applications span diverse fields, including chemistry, materials science, pharmaceuticals, and biology, for purposes such as chemical identification, structural analysis, and process monitoring.