Excitation of quintet states of the hafnium atom by electron impact

Excitation of quintet states of the hafnium atom has been investigated by a method of extended crossing beams by recording the optical signal from the intersection region. About 110 effective excitation cross sections of Hf I spectral lines within the region 248 to 800 nm have been measured; optical excitation functions changing the electron energy from the excitation threshold value to 200 eV have been recorded. The measured excitation cross sections range from 3*10 -19 to 9.6*10 -17 cm 2 (at an electron energy of 30 eV).