Spectral plasma temperature determination of thermionic vacuum arc in the titanium vapors

The titanium vapor plasma generated by a thermionic vacuum arc was spectroscopically investigated. The electronic temperature was obtained using the method of spectral lines intensity ratios. Three sets of spectral lines have been used, each set having the same energetic lower level namely: fundamental, 170.132 $cm−1$ and 386.874 $cm−1$ respectively. For an arc current $Iarc=1$ A and an arc voltage $Uarc=670$ V, an average electronic temperature of plasma $Te=(2860±587)$ K was obtained. Moreover, spectroscopic investigations of the interelectrodic plasma show that the discharge is totally sustained by evaporated anode material.