Читать книгу Spectroscopy for Materials Characterization - Группа авторов - Страница 12

The basic everyday experience of the colors around us inspires the knowledge of the phenomenon of radiation–matter interaction. Sun, the source of daylight, emits a large quantity of electromagnetic field frequencies (ν), or wavelengths (λ). When these rays impinge on matter, they can be reflected (scattered) or absorbed by the constituent atoms and molecules. These phenomena give rise to the appearance of colored objects since the light arriving at our eyes (a light sensor) depends on the emitted radiation or the reflected one, having fewer frequencies than the original sunlight due to the absorption effect of matter around us. In this chapter, some empirical aspects of absorption and emission phenomena will be introduced.