Wavelength Measurement
Wavelength Measurement - 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
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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
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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
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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
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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
Wavelength and frequency describe the same electromagnetic radiation from different perspectives, linked through the speed of light. A shorter wavelength corresponds to a higher frequency, while a longer wavelength corresponds to a lower frequency. This relationship helps chemists interpret spectral positions and relate observed features to transitions occurring within substances.
The instrument separates or selects incoming light according to wavelength, allowing individual spectral regions to be examined. A detector then records the intensity associated with the selected or separated radiation. Together, these components produce a spectrum in which changes in intensity can reveal absorption or emission features used for chemical characterization.
Electronic, vibrational, and rotational transitions involve different changes within a substance, so they can produce distinct spectral features. Wavelength measurement allows those features to be located and compared. Examining their positions helps connect spectral observations with the type of transition responsible and supports a more detailed interpretation of chemical behavior.
A spectrum can be examined to locate an absorption feature, after which a suitable analytical wavelength may be selected for measurement. Recording intensity at that wavelength supports concentration measurements. The reliability of the result depends on accurately locating the feature and maintaining trustworthy wavelength calibration throughout the analysis.
Substances can produce characteristic absorption or emission spectra, with features appearing at particular wavelength positions. Comparing the observed pattern with spectral characteristics allows researchers to support compound identification. This approach uses the overall distribution of spectral features rather than relying only on a single intensity reading, providing chemical characterization through spectral comparison.
Calibration establishes that reported wavelength positions correspond reliably to the radiation being measured. Without accurate calibration, absorption or emission features may be assigned incorrect locations, weakening compound characterization and analytical measurements. Maintaining calibration therefore supports dependable identification of spectral features and improves confidence in concentration results derived from selected wavelengths.