লক্ষ্য করুন: এই এন্ট্রির অনুবাদ বর্তমানে মান পর্যালোচনার অধীনে রয়েছে, তাই কিছু বিষয়বস্তু সাময়িকভাবে শুধুমাত্র ইংরেজিতে প্রদর্শিত হচ্ছে।
এই এন্ট্রিটি এখনও আপনার ভাষায় অনুবাদ করা হয়নি, তাই নিচে মূল লেখাটি দেখানো হচ্ছে।
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.
Examples
The stokes shift is essential for separating the excitation light from the emission signal in fluorescence microscopy.
The stokes shift is essential for separating the excitation light from the emission signal in fluorescence microscopy.
Why is the stokes shift so large in this specific organic dye?
A significant stokes shift prevents the self-absorption of emitted photons within the sample.
A significant stokes shift prevents the self-absorption of emitted photons within the sample.
I need to calculate the stokes shift to determine the energy loss during vibrational relaxation.
The observed stokes shift indicates that the molecule undergoes a structural change upon excitation.
The observed stokes shift indicates that the molecule undergoes a structural change upon excitation.
Look at the spectrum; the stokes shift is clearly visible as a gap between the two peaks.
We can tune the stokes shift by modifying the chemical structure of the fluorophore.
The researcher noted a minimal stokes shift in the rigid crystal lattice.