Wavelength Isolation
Wavelength Isolation - Related Videos
02:32
The de Broglie Wavelength
0 Views •
2020
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
01:33
Synergistic Photobiomodulation with a Dual-Wavelength Laser in an In Vitro Disease Model
0 Views •
2025
Divide the transwell system into five groups that undergo various treatments.The first group serves as the control and consists of a co-culture of neuroblastoma and microglia cells.In the second group, treat the co-culturer with fibrillar β-amyloid (fAβ) alone. fAβ induces damage in neuroblastoma cells.In the third group, treat neuroblastoma cells with an 808-nanometer laser, then co-culture them with untreated microglia.The laser reduces oxidative stress, improving neuronal survival.In the...
08:41
Single Wavelength Shadow Imaging of Caenorhabditis elegans Locomotion Including Force Estimates
0 Views •
Cited by 2 •
2014
The technique presented here measures the path of freely swimming microscopic species using single wavelength exposure. C. elegans are used to demonstrate shadow imaging as an inexpensive alternative to costly microscopes. This technique can be adapted to accommodate various orientations, environments and species to measure direction, speed, acceleration and forces.
07:44
Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes
0 Views •
Cited by 5 •
2016
Photostable cyanine dyes are attached to oligonucleotides to monitor hybridization by energy transfer.
10:32
Sample Preparation and Transfer Protocol for In-Vacuum Long-Wavelength Crystallography on Beamline I23 at Diamond Light Source
0 Views •
Cited by 2 •
2021
Here, we present a protocol for cryogenic sample preparation and transfer of crystals into the vacuum endstation on beamline I23 at Diamond Light Source, for long-wavelength macromolecular X-ray crystallography experiments.
FAQs
A monochromator separates the wavelengths present in a broader light source and uses a wavelength-selective slit to transmit only the desired range. The slit therefore determines which portion of the dispersed light reaches the chemical sample or detector, while other wavelengths are excluded. This selective transmission helps produce measurements under controlled and reproducible optical conditions.
An optical filter isolates a selected wavelength range by transmitting some wavelengths while blocking or attenuating others. Unlike a monochromator, it performs the selection through the properties of the filtering material rather than a dispersed spectrum and adjustable slit. Filters are therefore useful when a defined optical band is needed for analysis or photochemical excitation.
Narrow wavelength selection reduces the contribution of unwanted light to the observed signal or reaction. In UV-visible and fluorescence work, this can improve selectivity when identifying compounds or quantifying concentrations. In photochemistry, it also allows researchers to examine how a reaction responds to selected optical energies instead of exposing the system to a broad range.
Excitation wavelength selection controls which incoming light stimulates the chemical system, whereas emission wavelength selection controls which emitted band reaches the detector. Separating these optical roles helps distinguish the light used to excite a compound from its fluorescence signal. The resulting selectivity supports compound identification and concentration measurements under defined measurement conditions.
The light source is directed through a wavelength-selective component, such as a monochromator or optical filter, before reaching the sample or detector. The chosen wavelength range is then used for the measurement, excitation, or emission observation. Maintaining the same selection conditions across measurements supports comparison of signals and improves reproducibility.
It is useful when a chemical measurement must distinguish a compound's response from light at other wavelengths. Selected bands can support compound identification and concentration quantification in UV-visible analysis, while controlled excitation or emission selection improves fluorescence observations. The approach is especially relevant when spectral selectivity is needed for interpreting optical signals.
Photochemical experiments can use an isolated wavelength range to initiate a reaction with selected optical energy. Researchers can then compare reaction behavior under different wavelength conditions and examine wavelength-dependent effects. This controlled exposure helps connect the observed chemical response with the selected portion of the light source rather than with uncontrolled broad-spectrum illumination.