line broadening

The production of broadened spectral lines by various effects. The natural width of a spectral line is determined by quantum mechanical uncertainty. Other factors can, however, produce extra line width, including rapid rotation of a celestial body, Doppler broadening, pressure broadening, and the Zeeman effect. Considerations of the line profile can give information about the physical conditions of celestial objects.

Collins Dictionary of Astronomy © Market House Books Ltd, 2006

line broadening

[′līn ‚brȯd·ən·iŋ]

(spectroscopy)

An increase in the range of wavelengths over which the characteristic absorption or emission of a spectral line takes place, due to a number of causes such as collision broadening and Doppler broadening.

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References in periodicals archive ?

This acquisition represents the expansion into a new, critical service line broadening the suite of capabilities to more comprehensively serve new and existing customers.

Universal Plant Services Acquires Houston Controls

Finally, the dislocation density ([rho]) can be estimated by X-ray line broadening and obtained from dislocation densities that are related to D x ([[rho].sub.D]) and [epsilon] x ([[rho].sub.[epsilon]]) as follows [10]:

Transition of Dislocation Structures in Severe Plastic Deformation and Its Effect on Dissolution in Dislocation Etchant

The collision line broadening found from the processing is presented in Figure 2.

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

We found that in our spectrometer Er[(TMHD).sub.3] had no 2D spectrum alone plausibly due to the typical line broadening associated with LSRs, and the low concentration present.

Bench-top, Indirect-detection Experiments for [.sup.13]C-NMR Acquisition: Utilizing low-field NMR at a Primarily Undergraduate Institution

While the electron density calculated utilizing the Stark broadening effect, while another line broadening such as Doppler broadening and ionic broadening is so small comparing with Stark broadening that can be neglected [5].

Investigation of intensity distribution by image analysis for DC discharge

Williamson-Hall (W-H) analysis [11] considers that the contributions to line broadening of the crystallite size and lattice strain are independent of each other and both have a Cauchy-like profile; the final line breadth is the sum

Microstructure and Magnetic Properties of NdFeB Films through Nd Surface Diffusion Process

The nature of the structural disorder in the alloys was studied via Urbach energy, obtained from optical absorption, and Raman spectral line broadening. The alloying compositional fluctuation was found to be the dominating mechanism of the structural disorder for MgxZn1-xO alloys at the phase segregation range.

Optical phonon properties of MgxZn1-xO thin film alloys

This line broadening is caused by strong dipolar interactions of unpaired electrons in the bismuth samples [20].