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Spectroscopy
Spectroscopy is a branch of analysis devoted to identifying elements and compounds through the measurement of the absorption, scattering, or emission of electromagnetic radiation by atoms or molecules. It is widely used in physical and analytical chemistry, as well as in astronomy and remote sensing. Questions and answers here have to do with anything that has to do with Spectroscopy.
513 Questions
What Elements Are Present In The Star Sirius?
Hydrogen and helium are the most abundant elements in a star.
Why is a hollow cathode needed for atomic absorption spectrometry?
A hollow cathode is essential for atomic absorption spectrometry (AAS) because it serves as the light source that emits specific wavelengths of light corresponding to the element being analyzed. The design of the hollow cathode allows for the production of a narrow and intense beam of radiation, which enhances sensitivity and precision in detecting the absorbance of the target element. Additionally, the unique material of the cathode can be selected to match the element of interest, ensuring optimal excitation of atoms in the sample. This results in improved accuracy and reliability in quantitative analysis.
If colors have different wavelengths do they have different frequencies and temperatures?
Yes, light is electromagnetic waves.
The longest wavelengths have the lowest frequencies and the lowest temperatures.
The shortest wavelengths have the highest frequencies and the highest temperatures.
What is the light that our eyes can see?
It is called the visible part of the electromagnetic spectrum which includes the Red, Orange, Yellow, Green, Blue, Indigo, Violet (the colours of the rainbow) which, when added together, make White.
What is the use of the importance of the fingerprint region in infrared spectroscopy?
The fingerprint region in infrared spectrscopy is used for identifying compounds by matching the sample spectrum to the standard. The fingerprint region is specific to each compound. Very similar compounds will have small differences in the fingerprint region so the fingerprint region can be used to differentiate them.
How use an atomic absorption spectrometer to determine copper in minerals?
The principle is that each element has a specific wavelength for absorption. As in the molecular spectrophotometry the Lambert-Beer equation is used. The samples to be analyzed are atomized by different techniques (flame, graphite tube). The method is very useful because is accurate and specific. We need of course a series of standard solutions for each element.
How can detect free radicals by ESRA spectroscopy?
It is possible to detect free radicals by ESR spectroscopy and imaging through the use of nitroxides. ESR stands for Electric Spin Resonance. Nitroxides trap free radicals under the skin during UV irradiation.
To find wavelength of spectral line using diffraction grating?
To find the wavelength of a spectral line using a diffraction grating, you can use the formula: dsin(θ) = mλ, where d is the spacing of the grating lines, θ is the angle of diffraction, m is the order of the spectral line, and λ is the wavelength of the light. By measuring the angle of diffraction of the spectral line and knowing the grating spacing, you can calculate the wavelength of the light.
Dipole moment vector of water molecule?
The dipole moment vector of a water molecule points from the partially positive hydrogen atom to the partially negative oxygen atom. This is due to the unequal sharing of electrons in the O-H bonds, resulting in a polar molecule with a net dipole moment. The dipole moment is important for water's unique properties, such as its ability to form hydrogen bonds with other molecules.
Chemical terms used in raman spectroscopy?
Some common chemical terms used in Raman spectroscopy include "vibrational modes" (energy levels representing molecular vibrations), "Raman shift" (difference in energy between incident and scattered light), and "band assignment" (assigning Raman peaks to specific molecular vibrations).
Why does the sky turn black after a nuclear explosion?
It might be because of dust in the atmosphere elevated by the explosion. Particles of dust absorb and scatter visible light very well. And the sky turn to black because there is on light coming through dust clouds.
