Noun
English Wikipedia has an article on:spectral lineWikipedia
spectral line (plural spectral lines)
(physics) a dark or bright line in an otherwise continuous spectrum caused by the absorption or emission of light, at a single wavelength, by the movement of electrons between energy levels of an atom or molecule
In my view the structure of the whole atom was that of an individual, with all its parts interconnected, and the emission of a spectral line appeared to me to be the result of the coherence and co-operation of several electric quanta. Johannes Stark
Considering only homogeneous broadening affecting an atomic or molecular resonance, the spectral line shape function is described as a Lorentzian distribution : where is the full width at half maximum or FWHM bandwidth. Source: Internet
The long end of the EUV spectrum is set by a prominent He + spectral line at 30.4 nm. Source: Internet
In spectroscopy we observe a spectral line if atoms or molecules that we are interested in go from one state to another. Source: Internet
In visible light nebulae may be divided into emission nebulae that emit spectral line radiation from excited or ionized gas (mostly ionized hydrogen ); citation they are often called HII regions (the term "HII" refers to ionized hydrogen). Source: Internet
The latter mineral proved to contain far more of the element with the new spectral line, and Jean Charles Galissard de Marignac eventually separated a mineral oxide from cerite which he realized was the oxide of this new element. Source: Internet