Synchrotron radiation angular distributions

Fig. 10. Angular distribution of the synchrotron radiation intensity for different wave lengths for a storage ring operating at 3.5 GeV. v ( is the elevation angle perpendicular to the orbital plane...

Fig. 17 a and b. Comparison of the angular distribution (a) and spectral distribution (b) of synchrotron radiation with that of a X-ray tube... 

In practice, the greater the size, the smaller the effeet on the intensity distribution. So, elearly, the limit to what size ean be measured depends on the instrument s angular resolution. With traditional laboratory diffraetometers, the limit size is commonly considered to be in the range of 100 nm. The most reeent instruments developed for synchrotron radiation source achieve angular resolutions of up to a few thousandths of a degree [MAS 03], in which case the limit size that ean be measured is in the range of a few micrometers. 

Since synchrotron radiation is polarized, an anisotropic orientational distribution of molecules can be produced by core electron excitation. This distribution is determined by the orientation of the transition dipole moment with respect to the electric vector of the radiation. Information about this alignment and subsequent time evolution is eontained in the angular distributions of fragmentation products resulting from the excitation. Details have been worked out and described in several references for the case of valence electron excitation and ionization (Zare 1972 Yang and Bersohn... 

Tomboulian DH, Hartman PL (1956) Spectral and angular distribution of ultraviolet radiation from the 300-m.e.v. Cornell synchrotron. Phys Rev 102 1423-1447 Toney MF, Howard JN, Richer J, Borges GL, Gordon JG, Melroy OM, Wiesler DG, Yee D, Sorensen LB (1994) Voltage-dependent ordering of water molecules at an electrode-electrolyte interface. Nature... 

D.H. Tomboulian, P.L. Hartman Spectral and angular distribution of ultraviolet radiation from the 300 MeV Cornell synchrotron. Phys. Rev. 102, 1423 (1956)... 

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