Cathodic Vacuum Arc Plasma of Thallium

Author

Yushkov, Georgy Yu ; Anders, André

Author_Institution

High Current Electron. Inst., Russian Acad. of Sci., Tomsk

Volume

35

Issue

2

fYear

2007

fDate

4/1/2007 12:00:00 AM

Firstpage

516

Lastpage

517

Abstract

Thallium arc plasma was investigated in a vacuum arc ion source. As expected from previous considerations of cathode materials in the Periodic Table of Elements, thallium plasma shows leadlike behavior. Its mean ion charge state exceeds 2.0 immediately after arc triggering and diminishes to the predicted 1.60 and 1.45 after about 100 and 150 mus, respectively. The most likely ion velocity is initially 8000 m/s and decays to 6500 and 6200 m/s after 100 and 150 mus, respectively. Both ion charge states and ion velocities decay further toward steady-state values, which are not reached within the 300-mus pulses used here. It is argued that the exceptionally high vapor pressure and charge exchange reactions are associated with the establishment of steady-state ion values

Keywords

charge exchange; plasma collision processes; plasma sources; plasma transport processes; thallium; vacuum arcs; 100 mus; 150 mus; 8000 m/s; Tl; arc triggering; cathode materials; cathodic vacuum arc plasma; charge exchange reactions; ion charge state; ion velocity; vacuum arc ion source; vapor pressure; Anodes; Cathodes; Conducting materials; Plasma immersion ion implantation; Plasma materials processing; Plasma measurements; Plasma sources; Plasma temperature; Semiconductor materials; Vacuum arcs; Cathodic vacuum arcs; ion charge states; ion velocity; thallium;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2007.893265

Filename

4154914