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Stokes shift
This term is a specialized technical expression used primarily in spectroscopy and quantum chemistry. It describes the energy loss that occurs when a molecule absorbs a photon and subsequently emits one at a lower energy level, which manifests as a shift toward the red end of the spectrum.
Because it is named after the physicist George Gabriel Stokes, the word "Stokes" is always capitalized. In scientific literature, it is treated as a compound noun referring to a specific physical phenomenon rather than a general description of movement.
Meanings
The difference in wavelength between the positions of the band maxima of the absorption and emission spectra of the same electronic transition, typically resulting in the emitted photon having a longer wavelength than the absorbed photon.
The fluorescence spectrum showed a significant Stokes shift, indicating a loss of energy through vibrational relaxation.