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.

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