# Diffraction spectrum

## Definitions

• Webster's Revised Unabridged Dictionary
• Diffraction spectrum a spectrum produced by diffraction, as by a grating.
• Diffraction spectrum (Optics) See under Spectrum.
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## Usage

### In literature:

The spectroscope is the improved instrument by which the diffracting prism is best employed in producing the spectrum.
"Notable Events of the Nineteenth Century" by Various
He took the spectrum produced by diffraction instead of refraction, and measured that.
"The Telephone" by A. E. Dolbear
The diffraction spectrum is therefore termed a normal spectrum.
"The New Gresham Encyclopedia" by Various
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### In science:

Flat spectrum radio sources observed with a diffraction limited system produce a signal with very nearly the same frequency dependence as the CMB anisotropy making the spectral shape technique ineffective.
The Cosmic Microwave Background Anisotropy Experiments
We also give a summary of the measure theoretic approach to mathematical diffraction theory which underlies the unique decomposition of the diffraction spectrum into its pure point, singular continuous and absolutely continuous parts.
Diffraction of random tilings: some rigorous results
However, various details, and in particular the exact nature of the diffraction spectrum, have always been the topic of ongoing discussion, so that a more rigorous treatment is desirable.
Diffraction of random tilings: some rigorous results
This is Poisson’s summation formula for distributions [54, p. 254] and will be central for the determination of the Bragg part of the diffraction spectrum.
Diffraction of random tilings: some rigorous results
Theorem 2 Under the assumptions of Proposition 3, the diffraction spectrum consists, with probabilistic certainty, of a pure point (Bragg) part and an absolutely continuous part, so ˆγω = (ˆγω )pp + (ˆγω )ac .
Diffraction of random tilings: some rigorous results
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