JAB - Jablonski Diagram Relaxation mechanism for excited...

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Jablonski Diagram Relaxation mechanism for excited state molecules Once a molecule has absorbed energy in the form of electromagnetic radia- tion, there are a number of routes by which it can return to ground state (the statis- tically most common energy state for room temperature chemical species). The following graphic, termed a Jablonski diagram, shows a few of these processes. Jablonski diagram: If the photon emission (shown in short wavelength blue in the diagram) occurs between states of the same spin state (e.g. S 1 —> S 0 ) this is termed fluorescence. If the spin state of the initial and final energy levels are different (e.g. T 1 —> S 0 ), the emission is called phosphorescence (shown in longer wavelength red). Since fluo- rescence is statistically much more likely than phosphorescence, the lifetimes of fluorescent states are very short (1 x 10 -5 to 10 -8 seconds) and phosphorescence somewhat longer (1 x 10 -4 seconds to minutes or even hours; think about glow-in- the-dark flying disks). S
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JAB - Jablonski Diagram Relaxation mechanism for excited...

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