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In molecular spectroscopy, a Jablonski diagram is a diagram that illustrates the electronic states and often the vibrational levels of a molecule, and also the transitions between them. The states are arranged vertically by energy and grouped horizontally by spin multiplicity . [ 1 ]
Jablonski diagram indicating intersystem crossing (left) and internal conversion (right). Internal conversion is a transition from a higher to a lower electronic state in a molecule or atom. [ 1 ] It is sometimes called "radiationless de-excitation", because no photons are emitted.
Jablonski diagram of FRET with typical timescales indicated. The black dashed line indicates a virtual photon.. Förster resonance energy transfer (FRET), fluorescence resonance energy transfer, resonance energy transfer (RET) or electronic energy transfer (EET) is a mechanism describing energy transfer between two light-sensitive molecules (chromophores). [1]
English: Jablonski diagram of absorbance, non-radiative decay, and fluorescence. Electronic transitions are about 1 eV. Vibrational transitions are about 0.1 eV. Rotational transitions (not shown) are about 0.001 eV. Absorption is about 1 femtosecond, relaxation takes about 1 picosecond, fluorescence takes about 1 nanosecond.
Jablonski diagram, diagram that illustrates the electronic states of a molecule and the transitions between them; Jablonski by Pahls v. United States, a landmark court case that helped to define the ethical duties of mental health professionals with respect to potentially violent individuals.
Diagram of the Stokes shift between absorption and emission light spectra. Stokes shift is the difference (in energy, wavenumber or frequency units) between positions of the band maxima of the absorption and emission spectra (fluorescence and Raman being two examples) of the same electronic transition. [1]
Brownian Motion of a Nanoparticle. In fluorescence, [4] a molecule absorbs a photon and gets excited to a higher energy state. After a short delay (the average represented as the fluorescence lifetime ), it comes down to a lower state by losing some of the energy as heat and emitting the rest of the energy as another photon.
The former is typically a fast process, yet some amount of the original energy is dissipated so that re-emitted light photons will have lower energy than did the absorbed excitation photons. The re-emitted photon in this case is said to be red shifted, referring to the reduced energy it carries following this loss (as the Jablonski diagram shows).