Absorption band

Absorption band refers to a range of wavelengths, frequencies or energies in the electromagnetic spectrum which are characteristic of a specific absorption transition in a substance. This phenomenon is commonly observed in spectroscopy and is a fundamental concept in the study of light and its interactions with matter.

Overview

An absorption band is defined by the specific wavelengths of light that a substance absorbs. These bands are unique to each substance and can be used to identify the substance or determine its concentration in a sample. The concept of absorption bands is fundamental to many scientific fields, including physics, chemistry, and astronomy.

Formation of Absorption Bands

Absorption bands are formed when a substance absorbs light at specific wavelengths. This absorption occurs when the energy of the incoming light matches the energy difference between two quantum states of the substance. The absorbed energy is typically transferred to the substance, often causing it to undergo a physical or chemical change.

Applications

Absorption bands are used in a variety of scientific and industrial applications. In spectroscopy, they are used to identify substances and determine their concentration in samples. In astronomy, they are used to study the composition of celestial bodies and the interstellar medium. In environmental science, they are used to monitor air and water quality.

See Also

• Spectroscopy
• Absorption spectrum
• Emission spectrum
• Quantum mechanics