Spectral Interference
Spectral Interference - Related Videos
02:18
Interference and Diffraction
0 Views •
2020
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other. Alternatively, if the two waves coincide and interact in a way such that the trough of one wave coincides with the peak of the other (in an out of phase manner), the resultant wave will...
08:41
Interference and Diffraction
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN Interference and diffraction are characteristic phenomena of waves, ranging from water waves to electromagnetic waves such as light. Interference refers to the phenomenon of when two waves of the same kind overlap to give an alternating spatial variation of large and small wave amplitude. Diffraction refers to the phenomenon of when a wave passes through an aperture or...
01:23
RNA Interference
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2019
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated. This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
09:06
RNA Interference in Ticks
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Cited by 49 •
2011
A method for RNA interference (RNAi) by injection of dsRNA into unfed ticks is described. RNAi is the most widely used gene-silencing technique in ticks where the use of other methods of genetic manipulation has been limited.
04:16
Using Spectral Reflectometry to Determine Myelinated Axon Diameters in a Fixed Mouse Brain Slice
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2025
Source: Kwon, J., et al., Spectral Reflectometric Microscopy on Myelinated Axons In Situ. J. Vis. Exp. (2018) This video demonstrates the use of spectral reflectometry with a hyperspectral confocal microscope to analyze interference patterns and determine myelinated axon diameters in fixed brain tissue slices.
FAQs
When signals from an analyte and another species coincide, the instrument records a combined or distorted response rather than a clearly isolated analyte signal. This can make one substance appear more or less prominent than it actually is, creating uncertainty in identification and reducing the reliability of quantitative measurements. Careful spectral interpretation is therefore essential.
Potential contributors include other chemical components, the solvent, the sample matrix, and instrumental background. Their signals may occur near the analyte response or alter the surrounding spectral baseline. Considering all of these sources helps chemists distinguish a genuine analyte feature from a contribution produced by the sample environment or the measurement system.
Improved wavelength resolution can help distinguish signals that occur close together, making overlapping features easier to separate and interpret. This is especially important when several chemical species contribute responses in the same spectral region. Better resolution does not remove every source of interference, but it can reduce ambiguity in identifying and measuring the analyte.
The affected signal depends on the spectroscopic process being measured: a species may contribute emission, absorb radiation, or produce scattering. In each case, a response from another component, the matrix, solvent, or instrument can complicate interpretation. The appropriate correction therefore depends on the signal type and on how the interfering contribution appears in the measured spectrum.
A practical strategy begins by recognizing possible overlap or background contributions in the measured spectrum. Chemists may then improve wavelength resolution, apply background correction, or use spectral separation. Dilution can also be considered, followed by calibration to support quantitative interpretation. If uncertainty remains, a complementary analytical method can provide an independent basis for evaluation.
A complementary method is useful when the original spectrum remains difficult to interpret after correction, separation, dilution, or calibration. Using another analytical approach can provide additional evidence about the analyte without relying entirely on the affected signal. This supports more reliable conclusions in chemistry, particularly for atomic absorption, emission, infrared, and molecular spectroscopy.