Table of Contents
What is difference between FES and AAS?
The key difference between flame emission spectroscopy and atomic absorption spectroscopy is that during flame emission spectroscopy, certain wavelengths are emitted from atoms, whereas during atomic absorption spectroscopy, certain wavelengths are absorbed by atoms.
What is the purpose of flame emission spectroscopy?
Nevertheless, flame emission spectrometry is widely used for the determination of the alkali elements (lithium, sodium, and potassium), whose excitation states are low enough to be populated at flame temperatures. Higher-energy sources produce higher temperatures and therefore more emission lines.
What is Echelle grating describe Echelle monochromator *?
An echelle grating (from French échelle, meaning “ladder”) is a type of diffraction grating characterised by a relatively low groove density, but a groove shape which is optimized for use at high incidence angles and therefore in high diffraction orders.
What is the difference between flame photometer and AAS?
The main difference between flame photometry and atomic absorption is that in flame photometry the radiation emitted from the flame is measured, and in atomic absorption the decrease in the intensity of the radiation from thehollow cathode due to the absorption by the atoms in the flame is measured.
What are the advantages of AAS over Fes?
Advantages of Atomic Absorption over Flame Photometry: (1) It does not suffer from spectral interference, which occurs in flame emission spectroscopy. (2) By atomic absorption technique, traces of one element can easily be determined in presence of high concentration of other elements.
What are the advantages of flame emission spectroscopy?
speed (they are quick) accuracy (they reliably identify elements and compounds) sensitivity (they can detect very small amounts of a substance in a small amount of sample)
What is Rowland circle?
The Rowland circle is a circle of radius R that lies tangent to a concave curved diffraction grating of radius 2R. If the entrance slit of incoming light is positioned on this circle, then rays reflected by the grating will be focused at various points along the same circle based on wavelength and diffraction order.
What is grating spectrometer?
An instrument that uses a diffraction grating to disperse light into a spectrum. Gratings may be placed at the focus of a telescope (a focal-plane spectrometer) or in front of a telescope (an objective spectrometer). Grating spectrometers are used for spectroscopy at wavelengths from X-rays to the far infrared.
What is the instrument used in flame emission spectroscopy?
Flame emission spectroscopy The flame emission spectroscope is a scientific instrument based on flame testing. Data from a spectroscope can be used to: Identify metal ions in a sample.