Electrons Stand Still As Scientists Rewrite Molecular Rules
New molecular design rules discovered through laser-based spectroscopic techniques enable the uncoupling of electrons from atomic vibrations, leading to significantly improved performance in applications such as OLEDs and biomedical imaging.
Since the discovery of quantum mechanics more than a hundred years ago, it has been known that electrons in molecules can be coupled to the motion of the atoms that make up the molecules. Often referred to as molecular vibrations, the motion of atoms act like tiny springs, undergoing periodic motion.
For electrons in these systems, being joined to the hip with these vibrations means they are constantly in motion too, dancing to the tune of the atoms, on timescales of a millionth of a billionth of a second. But all this dancing around leads to a loss of energy and limits the performance of organic molecules in applications like light-emitting diodes (OLEDs), infrared sensors, and fluorescent biomarkers used in the study of cells and for tagging diseases such as cancer cells.
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