How is an emission spectrum produced? ? , where the emission spectrum of the elements is the distinguishing feature of each chemical element, and in fact the emission spectrum of the chemical elements cannot match, each element has its own spectrum, and in this article we will talk in detail about the emission spectrum, and we will also explain how to produce these spectra for different elements.
What is the emission spectrum?
The emission spectrum is the spectrum of frequencies of electromagnetic radiation emitted by an atom or molecule that moves from a high energy state to a lower energy state, and the energy emitted from a photon is equal to the energy difference between the two states, and there are many possible electron transitions for each atom, and each transmission has a certain energy difference, where it consists The emission spectrum from this group of different transitions, which leads to different radiant wavelengths, and in fact each chemical element has its own spectrum that distinguishes it from the rest of the chemical elements, and therefore spectral analysis can be used to identify elements with a non-constituent composition. It is known, the emission spectra of molecules can be used in the chemical analysis of various substances.
Emission can be defined in physics as the process by which the high-energy quantum mechanical state of a particle is converted into a lower state through the emission of a photon, resulting in the production of light. , the energy difference between the two states is equal to the energy carried by the photon, and the energy states in the transitions can lead to emissions over a very wide range of frequencies.
See also: What is meant by the electromagnetic spectrum?
How is an emission spectrum produced?
The emission spectrum is produced by Heating the chemical elementWhere the atom absorbs a quantity of thermal energy that works to gain the kinetic energy of the electrons, and when the electrons are excited in an element as a result of gaining energy, they move to higher energy orbits, and when the electrons return to the energy level in which they were present in the beginning, they will get rid of the acquired energy in the form of A light ray has a certain frequency, and all this happens because the electrons in the atom tend to arrange a certain arrangement so that the energy of the atom is as low as possible, and when these atoms are given a certain amount of energy, the electrons will absorb this energy and move to a high energy level, in order to restore order inside the atom and rebalancing the energy in it, and when the electrons return to the lower levels or the so-called ground levels, they will release the energy they gained previously in the form of electromagnetic radiation.
See also: The seven colors of the spectrum
Spectra types
Spectra can be divided into two basic types, as follows:
emission spectra
Whereas, when the light emitted directly from the source is examined using a spectrophotometer, the emission spectrum is obtained, and each light source has its own emission spectrum, and the emission spectrum consists of three types, namely:
continuous spectrum: It consists of uninterrupted luminous bands of all wavelengths, as this type contains all colors from violet to red, and these spectra depend only on the temperature of the source.
Line spectrum: They are sharp lines with specific wavelengths, and this spectrum is a characteristic of the emitted material, as it is used to determine the type of gas emitted.
Frequency spectrum: This spectrum consists of a number of bright bands that have a sharp edge at one end, but fade at the other.
absorption spectra
Whereas, when the light emitted from the source passes through an absorbent material, and then examined using a spectrophotometer, the amount of absorption spectrum is obtained, and the absorption spectrum consists of three types, as follows:
continuous absorption spectrum.
line absorption spectrum.
band absorption spectrum.
At the end of this article we got acquainted How is an emission spectrum produced?We also explained what an emission spectrum is, and mentioned in detail all kinds of normal spectra.
