A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies. A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies. Emission Line Spectrum.

Spectral lines are often used to identify atoms and molecules from their characteristic spectral lines. Line-emission spectrum synonyms, Line-emission spectrum pronunciation, Line-emission spectrum translation, English dictionary definition of Line-emission spectrum. A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies. It is completely absorbed by oxygen in the upper stratosphere, dissociating O 2 molecules to O atoms which react with other O 2 molecules to form stratospheric ozone. Spectral lines are often used to identify atoms and molecules. It is the strongest atomic emission line from the sun and drives the chemistry of the upper atmosphere of all the planets, producing ions by stripping electrons from atoms and molecules. The photon energy of the emitted photon is equal to the energy difference between the two states. When the atom goes back to its ground state, either directly or via intermediate energy levels, photon of only certain frequencies are emitted due to the discrete energy levels. The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an atom or molecule making a transition from a high energy state to a lower energy state. Bright-line spectrum definition is - an emission spectrum consisting of bright lines against a dark background. The atom is first excited by a colliding electron.

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