Excitation of PtI Transitions Terminating on Singlet Levels

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The method of extended crossing beams is used to investigate the excitation of platinum atom transitions terminating on singlet levels. Thirty eight excitation cross sections are measured at the electron energy of 30 eV; nine optical excitation functions are recorded in the electron energy range from zero to 200 eV. Also measured are eight excitation cross sections of transitions which have even upper levels. Possible excitation channels are discussed, which define the absolute values of cross sections and the form of optical excitation functions.