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Abstract
Optical excitation function and polarization of some Sr and Zn lines were measured using the crossed beam apparatus, which designed and constructed by the Beni-Suef atomic physics laboratory group.
The optical excitation function measurements were carried out by measuring the intensity of the emitted light from the interaction region as a function of the incident electron energy in the range from threshold to 200 eV. The optical excitations function of Sri (1 = 4607A) 5!P -> 5!S shows a steep rise from threshold energy to a maximum value at ~ 13eV, then decrease rapidly with increasing the incident electron energy. The present data are compared with those of Chen et.al. [11] and both data showed a good agreement. The shape of the excitation function of SrII (4216 A) 52Pi/2 -* 52Si/2 rise to maximum at -29 eV, then it decreases exponentially with increasing the incident electron energy. Indeeped, in this case the comparison with Chen etal. [11] are in good agreement . Both results show similar structure near 23 eV and near 27 eV, which may cause by cascade contributions. In case of Zn atoms, the shape of the excitation function of Znl (6362 A) 4!D -* 4*P shows a steep rise from near the threshold energy to a maximum at ~ 27 eV and then it decreases rather quickly with increasing the incident electron energy.
The emitted photons from the excited atom / ion following the electron impact are partially polarized. The polarization measurements were carried out by measuring the intensity of the emitted light parallel and perpendicular to the electron beam direction. These measurements were obtained as a function of the incident electron energy from threshold to 200 eV.
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S urn fnary & References
The present polarization measurements of Sri (1 = 4607A) 5 ’P -».5!S show a maximum value of 25.34 % at energy ~ 8 eV and a linear fall off towards zero as the incident electron energy increases. The polarization changes from positive values to negative values at an energy of approximately 27.5 eV. The results were compared with the data of Chen et.al.[ll], and show a good agreement. The present polarization measurements of Znl (1 = 6362A)line 4 D -» 4 P show maximum value of ~ 43.4 % at E - 27 eV and a linear fall off towards zero as the electron energy increases. The polarization changes from positive to negative values at an energy of approximately 63.5 eV .