line spectrum

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line spectrum:

see spectrumspectrum,
arrangement or display of light or other form of radiation separated according to wavelength, frequency, energy, or some other property. Beams of charged particles can be separated into a spectrum according to mass in a mass spectrometer (see mass spectrograph).
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Line spectrum

A discontinuous spectrum characteristic of excited atoms, ions, and certain molecules in the gaseous phase at low pressures. If an electric arc or spark between metallic electrodes, or an electric discharge through a low-pressure gas, is viewed through a spectroscope, images of the spectroscope slit are seen in the characteristic colors emitted by the atoms or ions present. See Atomic structure and spectra, Spectroscopy

McGraw-Hill Concise Encyclopedia of Physics. © 2002 by The McGraw-Hill Companies, Inc.

line spectrum

A spectrum consisting of discrete lines (spectral lines) resulting from radiation emitted or absorbed at definite wavelengths. Line spectra are produced by atoms or ionized atoms when transitions occur between their energy levels as a result of emission or absorption of photons. The Fraunhofer lines of the Sun are an example of an absorption line spectrum.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

line spectrum

[′līn ‚spek·trəm]
(spectroscopy)
A spectrum of radiation in which the quantity being studied, such as frequency or energy, takes on discrete values.
Conventionally, the spectra of atoms, ions, and certain molecules in the gaseous phase at low pressures; distinguished from band spectra of molecules, which consist of a pattern of closely spaced spectral lines which could not be resolved by early spectroscopes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The energy of the energetic electron beam was high enough to produce Pb-[K.sub.[alpha]1] (74 keV) line radiation in the X-ray line spectra. However, this radiation was impossible to be detected by our spectrometer because of its constraints in the energy range.
In XRF, the sample is irradiated with an x-ray beam, which causes the elements in the sample to emit, or fluoresce, their appropriate x-ray line spectra. This allows the instrument to identify not only the specific elements in a sample by the wavelengths of their spectral lines, but also their concentration levels by the intensities of their lines.
Most of these pollutants are hydrocarbons that have line spectra in the IR fingerprint region of 8 to 12 ||micro~meter~.