absorptionslinje

An absorption line is a dark line in a spectrum that appears due to the absorption of light at specific wavelengths by atoms or molecules in a medium. These lines are a result of the interaction between light and matter, where photons are absorbed by electrons in atoms or molecules, causing them to transition to higher energy levels. The specific wavelengths at which absorption occurs are characteristic of the atoms or molecules involved, making absorption lines useful for identifying and studying these substances.

Absorption lines are observed in various types of spectra, including stellar spectra, which are used to determine the composition and physical properties of stars. They are also observed in the spectra of other celestial objects, such as galaxies and nebulae, and in laboratory spectra of gases. The study of absorption lines is a fundamental aspect of astrophysics and spectroscopy.

The width and depth of absorption lines can provide information about the physical conditions of the absorbing medium, such as temperature, density, and velocity. Broad absorption lines, for example, may indicate the presence of high-velocity gas, while narrow lines may suggest the presence of cooler, more quiescent gas. The study of absorption lines is also used to investigate the dynamics of interstellar and intergalactic media.

In summary, absorption lines are dark features in spectra that result from the absorption of light by atoms or molecules. They are a valuable tool for studying the composition and physical properties of celestial objects and are a fundamental aspect of astrophysics and spectroscopy.