spectral line

[′spek·trəl ‚līn]

(spectroscopy)

A discrete value of a quantity, such as frequency, wavelength, energy, or mass, whose spectrum is being investigated; one may observe a finite spread of values resulting from such factors as level width, Doppler broadening, and instrument imperfections. Also known as spectrum line.

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Spectral Line

a thin line in an optical spectrum. Each such line can be characterized by a certain wavelength λ or frequency v = c/λ, where c is the speed of light. Spectral lines are observed in emission spectra as bright (colored) lines on a dark background and in absorption spectra as dark lines on a bright background. Each spectral line corresponds to a definite quantum transition in an atom, molecule, or crystal. Spectral lines are not strictly monochromatic: each one has a certain width Δλ.

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References in periodicals archive

Correlation between spectral line intensities and calorific value

DETERMINATION OF THE CALORIFIC VALUE AND MOISTURE CONTENT OF CRUSHED OIL SHALE BY LIBS

This occurs due to a spectral leakage from the "negative" frequency spectral line [7].

On the Impact of Amplitude Variation on Interpolated DFT Method and How to Reduce It

Kochanov, "Combined effect of small- and large-angle scattering collisions on a spectral line shape," Journal of Quantitative Spectroscopy and Radiative Transfer, vol.

Retrieval of Total Scattering Cross Sections of Molecules from Inhomogeneously Broadened Absorption Lines

A quantitative investigation of spectral line intensities in O-and B-type stars.

Liquid Metallic Hydrogen II. A critical assessment of current and primordial helium levels in the sun

Plasma temperature determination from the total intensity of a self-reversed spectral line. J Appl Phys.

Self-Reversed scandium lines as a diagnostic tool for multicomponent HID lamps

Rydberg spectral lines of an atom are sometimes superimposed on the continuous spectrum of a different configuration.

On the absorption spectrum of noble gases at the arc spectrum limit

A side advantage is the presence of a discrete spectral line in the spectrum at the clock frequency, which makes the clock extraction easier.

CLOCK RECOVERY AT GIGABIT-PER-SECOND DATA RATES

The maximum power spectral line, observed at 2.78 LPC, was compared to simulated data and was found to rank between 47th and 48th out of 1000 simulated power values.

Signal processing analysis of forced-choice ESP data: evidence for psi as a wave of correlation

The filter bandwidth is 200 Hz, the position in frequency is decided based on spectral lines as defined in [10], the first filter contains the spectral line that corresponds to the first formant in the last time interval.

Programmable execution of multi-layered networks for automatic speech recognition

Directing a number of laser shots with high repetition rate to the same spot of the sample under an argon purge, the changes in the spectral line intensities in LIBS spectra over the course of measurements were related to H/C ratios determined on isolated kerogens from the rock samples.

Determination of Heating Value of Estonian Oil Shale by Laser-Induced Breakdown Spectroscopy