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Cosine smearing

Fig. 3.11 Velocity distribution (cosine smearing effect) in the case of identical source and collimator radius, for different aperture a, the ratio of collimator radius to source-collimator separation (adapted from [30])... Fig. 3.11 Velocity distribution (cosine smearing effect) in the case of identical source and collimator radius, for different aperture a, the ratio of collimator radius to source-collimator separation (adapted from [30])...
Cosine smearing. Because instrument volume and experiment time must both be minimized for a planetary Mossbauer spectrometer, it is desirable in backscatter geometry to illuminate as much of the sample as possible with source radiation. However, this requirement at some point compromises the quality of the Mossbauer spectrum because of an effect known as cosine smearing [327, 348, 349] (see also Sects. 3.1.8 and 3.3). The effect on the Mossbauer spectrum is to increase the linewidth of Mossbauer peaks (which lowers the resolution) and shift their centers outward (affects the values of Mossbauer parameters). Therefore, the diameter of the source y-ray beam incident on the sample, which is determined by a... [Pg.450]

The dependence of Mossbauer parameters on geometric arrangements is mainly due to the cosine smearing of the velocity u. Since the Doppler energy shift AEy is given by... [Pg.1421]

The origin of cosine smearing, u is the velocity of the source relative to the absorber... [Pg.1421]

See other pages where Cosine smearing is mentioned: [Pg.44]    [Pg.56]    [Pg.60]    [Pg.61]    [Pg.61]    [Pg.62]    [Pg.120]    [Pg.451]    [Pg.44]    [Pg.56]    [Pg.60]    [Pg.61]    [Pg.61]    [Pg.62]    [Pg.120]    [Pg.451]    [Pg.214]    [Pg.199]    [Pg.306]    [Pg.678]   
See also in sourсe #XX -- [ Pg.44 , Pg.45 , Pg.56 , Pg.60 , Pg.61 , Pg.450 ]



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Cosin

Smear

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