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spectral line |
Also found in: Wikipedia, Hutchinson | 0.03 sec. |
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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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Spectral tables for four cosmically abundant elements (Ne, Mg, Si, and S) in the wavelength region of interest for the Chandra X-Ray Observatory, which is roughly 2 nm to 17 nm, have been critically compiled with partial support from the Chandra Emission Line Project. By measuring the width of the magnesium-ion emission line, Chris Willott of the Herzberg Institute of Astrophysics in Victoria, Canada, and his colleagues deduced the disk's velocity, enabling them to calculate the black hole's mass. It is well recognized that the peak height of an x-ray emission line measured with a wavelength dispersive spectrometer (WDS) is a sufficient approximation for quantitative microanalysis on a routine basis using an Electron Probe Micro Analyzer (EPMA). |
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