What is Stern-Volmer quenching?
What is Stern-Volmer quenching?
The Stern–Volmer relationship, named after Otto Stern and Max Volmer, allows the kinetics of a photophysical intermolecular deactivation process to be explored. Processes such as fluorescence and phosphorescence are examples of intramolecular deactivation (quenching) processes.
What does a Stern-Volmer plot show?
The Stern Volmer plot is the plot is that of Io/I vs Concentration as said . But it can be also expressed as (Io-I)/I=K[Q]. This is a particular case of the plot of (Io-I)/(I-I∞)=K[Q] where I∞ is the remaining intensity for an infinite concentration of quencher [Q].
How do you quench fluorescence?
Abstract. Fluorescence quenching refers to any process that decreases the fluorescence intensity of a sample. A variety of molecular interactions can result in quenching. These include excited-state reactions, molecular rearrangements, energy transfer, ground-state complex formation, and colli-sional quenching.
Why is fluorescence quenching important?
Fluorescence quenching is an important technique for measuring binding affinity between ligands and proteins. Fluorescence quenching is the decrease in the quantum yield of fluorescence from a fluorophore, induced by a variety of molecular interactions with quencher molecule(s).
How does oxygen quench fluorescence?
Molecular oxygen is known to be an efficient quencher of the fluorescence of aromatic hydrocarbons (Berlman, 1965; Ware, 1962). The studies so far published show quenching by oxygen to be a diffusion-controlled process in which virtually every collision with the excited fluorophore is effective in quenching.
What is quenching in spectroscopy?
Quenching refers to any process which decreases the fluorescence intensity of a given substance. A variety of processes can result in quenching, such as excited state reactions, energy transfer, complex-formation and collisional quenching. Molecular oxygen, iodide ions and acrylamide are common chemical quenchers.
What is internal quenching?
The heat treatment method Internal Quenching constitutes an alternative method to increase the surface strength of internally loaded high pressure steel components like common rail parts, pipelines, or valves.
What is the quenching rate?
1013 degrees/second
The rate of quenching corresponds to the rate of heat flow by lattice phonons and is estimated to be 1013 degrees/second. Therefore, it appears that any liquid can be quenched into a glass provided the required high degree of quenching rate is achieved and this aspect will be discussed later.
What is the quantum yield for quenching?
This quantum yield is the number of emitted photons relative to the number of absorbed photons. The intensity of the emission can be decreased by different processes. Theses decreases in intensity are called quenching and can occur by different mechanisms.
What is fluorescence self quenching?
Self-quenching is a special type of fluorescence quenching in which fluorophore and quencher molecules are the same. Fluorescence self-quenching is particularly evident in highly concentrated solutions of fluorophores at right-angle geometry [15], [18], [19].
