Probe and radiation measurements in the copper arc

✍ Scribed by Nottingham W.B.

• Publisher: Elsevier Science
• Year: 1929
• Tongue: English
• Weight: 693 KB
• Volume: 207
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(29)91444-7

✦ Synopsis

The Langmuir probe has been Foundation used to explore the copper arc. The cathode Communication No.34. fall of the normal are has been found to be 20.5 volts, which equals the second ionization potential of copper Cu (II), while the cathode fall for the hissing arc has been fol~nd to be 14.o volts. The potential gradient along the arc stream is constant and therefore the space charge is zero and the concentrations of positive ions and electrons are equal. The average energy of the electrons throughout the arc is between 2.1 and 2.7 volts. The space potential, when measured with reference to the cathode, depends on the current flowing in the arc in the same way as the over all potential, i.e., B V = A + ~where A, B, and n are constants. The positive ion concentration in the arc stream increases as the arc current increases according to the equation n+ = b( "z where a and b are constants. The light per unit volume has been measured for twelve copper arc spectrum lines and found to