Triple differential cross sections (TDCS) are estimated for the ionization of
metastable 3d-state hydrogen atoms by electron at 250 eV for various kinematic
conditions pursuing a multiple scattering theory. The present new results
are compared with the theoretical results of hydrogenic different metastable
states as well as the hydrogenic ground state experimental data. Obtained
new finding results are in good qualitative agreement with those of
compared theories. The present results give an immense opportunity for experimental
trial in the field of ionization problems.
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