At present, the low-pressure mercury light source is the most commonly used in Raman spectroscopy. Under normal operating conditions (2.5 kW) it can be calculated that up to 50 W of energy of such a light source is radiated in the 4358 Ǻ line of the mercury spectrum which is frequently used to excite Raman spectra. However, due to the geometry of the mercury light source, only a small fraction of the emitted radiation is utilized in illuminating the sample; in fact, a reasonable estimate is that about 1 W of power in the 4358 Ǻ line is responsible for the excitation of Raman spectra of liquid samples. Even less radiation is available for irradiating solid samples.
KeywordsRaman Spectrum Raman Spectroscopy Laser Cavity Depolarization Ratio Laser Tube
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