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custom earrings for girls What is the absorption spectrum of colored gemstones?

Опубликовано в от Король

The color of a gem is caused by the selective absorption of visible light of different wavelengths by the gem, and the unabsorbed light mixes to form the body color of the gem. Absorption spectrum refers to the spectrum composed of a series of black lines and bands that appear in the visible light spectrum when observing the visible light from gems with a spectroscope. These black-clad lines and bands are produced by colored gems absorbing specific wavelengths of light. The spectrum is interrupted.

The color-causing elements in gems have specific absorption spectra. Поэтому, according to the number, position and width of the absorption lines or bands in the absorption spectra, the elements that cause the absorption spectra can be determined, and then the types of gems can be determined. The same color-causing ion may produce different absorption spectra in different gems, so absorption spectra are often used to distinguish different gems of the same color.

The main color-causing elements in gems mainly include chromium (Cr), железо (Fe), manganese (Mn), cobalt (CO) и так далее. Chromium can produce green and red, red such as ruby, spinel, green such as emerald, Александрит, green jade, и т. д.; iron can produce red and green, blue and yellow, и т. д., iron-colored gems are usually darker in color ; Manganese can produce pink and orange; cobalt can produce blue and pink. Кроме того, the rare earth elements neodymium and praseodymium can produce yellow and green colors.

Spectroscope is an instrument used to observe the absorption spectrum of gemstones. It arranges the white light in order of wavelength to determine which wavelength bands of the light are absorbed by the gemstone. The observer can base on the number, position and number of absorption lines or bands. Ширина, to judge the color-causing elements contained in the gem. Например, the color of olivine is caused by iron content, and the absorption spectrum has characteristic iron line absorption. When observed with a spectroscope, three absorption bands of 437 nm, 477 nm and 497 nm can be seen.

 

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