1. Definition and characteristics: Emerald is a kind of yellow or yellow-green gemstone with bright and soft color and a hint of fruity green. The chemical composition of this gem contains a trace of iron, which makes it present a unique color. In addition, emerald has the characteristics of high thermal conductivity, high hardness, wear resistance and durability, and is not easy to be damaged.
2. Distribution of origin: Emerald is mainly produced in granite pegmatite and placer. The most famous producing areas are India and Sri Lanka, among which emeralds produced in India have the best quality and the highest value. In addition, emeralds are also produced in Brazil, Myanmar, Kenya, Italy, Australia and Africa.
3. Use and value: Emerald has high value because of its rarity and beautiful color. It is widely used to make jewelry, such as rings, necklaces and earrings. Emerald is also used to manufacture precision machinery and instruments, and to study crystal structure and physical properties. Because of its rarity and value, emeralds have also become collectors' favorite collections.
Absorb narrow-band related data
Generation mechanism of 1. The absorption narrow band is mainly produced by electronic transition and molecular vibration inside the material. When light strikes a substance, electrons will jump from a low energy level to a high energy level, and at the same time absorb light energy with a specific wavelength. This transition process is instantaneous, resulting in a narrow distribution of absorption bands. In addition, molecular vibration can also produce absorption bands, which are characterized by a wide wavelength range.
2. Characteristics and classification: absorption narrow band has the following characteristics: first, it has a specific wavelength and intensity, reflecting the electronic structure and molecular vibration mode inside the substance; Second, it is related to the nature and structure of substances, and different substances have different absorption bands; Third, it can be measured and studied by spectral analysis. According to the different generation mechanism, the absorption narrow band can be divided into electron absorption band.
3. Application field: absorption narrow band has a wide range of applications in many fields. For example, in chemical analysis, the chemical composition and structure of a substance can be judged by measuring its absorption band; In environmental science, the impact on the environment and human health can be evaluated by measuring the absorption zone of pollutants in water and atmosphere; In materials science, we can adjust the absorption band of matter.