spectrum - a concept introduced by Isaac Newton in the seventeenth century, denoting the set of all values of a physical quantity.Energy, mass, optical radiation.It is the latter often have in mind when we speak of the light spectrum.Specifically, the light spectrum is a set of strips of optical radiation of different frequencies, some of which we see every day in the world, as part of their inaccessible to the naked eye.Depending on the possibility of the human eye, the light spectrum is divided into the visible part and the invisible.The latter, in turn - on the infrared and ultraviolet light.
Types spectra
There are also different types of spectra.There are three, depending on the spectral intensity of radiation.Spectra can be continuous, linear and striped.Types of spectra measured by spectral analysis.
continuous spectrum
continuous spectrum is formed by heated to a high temperature solids or gases high density.The well-known rainbow of seven colors is a direct example of the continuous spectrum.
line spectrum
line spectrum is also kinds of spectra and the proceeds from any substance in gaseous atomic state.It is important to note that it was in the atomic and not molecular.This range provides a very low interaction of atoms with each other.Since there is no interaction between atoms permanently emit waves of the same length.An example of this spectrum is the glow of gas heated to a high temperature.
Striped range
band spectrum is visually distinct bands, clearly demarcated quite dark intervals.In addition, each of these bands is not strictly defined radiation frequency, and consists of a large number of closely spaced light lines.An example of these spectra, as in the case of the line spectrum, a glow vapor at high temperature.However, they are not atoms and having a very close relationship overall molecules, which causes a similar glow.
absorption spectrum
However, this kind of spectra did not end there.Additionally emit even look as the absorption spectrum.Spectral analysis of the absorption spectrum - is dark lines on a background of a continuous spectrum and substantially absorption spectrum - the expression depending on the wavelength of the absorption index material which may be more or less high.
Although there is a wide range of experimental approaches to the measurement of the absorption spectra.The most common is an experiment when the radiation beam generated by the white light is passed through a cooled (for lack of interaction particles and hence luminescence) gas, and then determines the intensity of radiation passing therethrough.The transmitted energy may be used to calculate absorption.
