Accession Number : ADA217087


Title :   Correlation-Induced Changes of Spectra


Descriptive Note : Technical rept.


Corporate Author : ROCHESTER UNIV NY


Personal Author(s) : Wolf, Emil


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a217087.pdf


Report Date : Dec 1989


Pagination or Media Count : 78


Abstract : It is generally taken for granted that the spectrum of light does not change on propagation. This belief is implicit in all spectroscopy. In the last few years it was discovered that while such spectral invariance holds for radiation from commonly used sources it does not hold, in general, because the spectrum of emitted radiation depends not only on the source spectrum but also on the coherence properties of the source. It was found that in some cases the induced changes may be appreciable, possibly resulting in frequency shifts of spectral lines. It has also been demonstrated that similar spectral changes may be produced by scattering on random media whose dielectric susceptibility fluctuations are appropriately correlated. Very recently it was shown that under certain circumstances the frequency shifts generated by dynamic scattering may imitate the Doppler effect, even though the source, the scatterer and the observer are all at rest relative to each other. (emk)


Descriptors :   *SPECTRAL LINES , FREQUENCY SHIFT , SPECTROSCOPY , DYNAMICS , THEORY , COHERENCE , DIELECTRICS , LIGHT , TURBULENCE , LASER BEAMS , VARIATIONS , SPECTRA , SCALE , COMMUNICATION AND RADIO SYSTEMS , MEDIA , REST , SPECTRORADIOMETERS , DOPPLER EFFECT , SOURCES , SCATTERING


Subject Categories : Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE