Question

Why is it important that the inner surfaces of the most spectrometers are painted a black color? Explain how this influences spectrophotometric analysis.

Answer 1

When a laser radiation falls on any metallic surface, it produces several effects like scattering, ejecting electrons from the surface of metal, produce thermal effects and others. All these effects give rise to noise and unnecessary radiations with various wavelength. These radiations have the potential to interfere witht the spectrophotometric analysis. Also, the photometers are very sensitive to the photons. They amplify signal produced from the photons arriving on it to detect the smallest possible effects. To avoid these, spectrometers are painted black from inside. The black paint absors the unnessary radiations.