Desorbiert

Desorbiert is the past participle and adjective of desorbieren in German, used in scientific contexts to describe a species that has been removed from a surface by desorption. In surface science and related fields, a desorbiertes or desorbierter species has transitioned from an adsorbed state on a solid surface to the surrounding phase, such as a gas or liquid.

Desorption is the process opposite to adsorption: adsorbates detach from a solid surface and enter the gas or liquid phase. It is a central concept in surface science, catalysis, environmental chemistry and sensor technology. Desorption can occur through several mechanisms, including thermal desorption (driven by heating and described by Arrhenius-type kinetics), photo-desorption (triggered by photons), and chemical desorption (products released as a result of surface reactions).

Desorbierte species are analyzed in terms of desorption rate, onset temperature, and binding energy, with kinetic models ranging from first-order to Langmuir-type descriptions. Experimental techniques for studying desorption include temperature-programmed desorption (TPD), which measures desorption rate as a function of temperature, and mass-sensitive methods like quartz crystal microbalance (QCM) to monitor mass loss, often complemented by spectroscopic identification of the desorbed species.

The concept is important for understanding catalytic turnover, surface poisoning and regeneration, pollutant mobility in the environment, and the response of gas sensors. Examples include CO desorbing from platinum surfaces, water desorbing from silica-based materials, and organic molecules desorbing from metal oxides.

See also: adsorption, desorption energy, catalysis, surface science.