The Excitation and Transport of Metal Vapour in Short Sparks in Air

The paper describes a study of the excitation temperature in certain spark discharges of accurately known current characteristics. The excitation temperatures are found by measuring intensity ratios for certain spectral lines where the relevant transition probabilities are known, and are comparable with earlier work by Ornstein and his collaborators on arc discharges. The excitation temperatures are, as would be expected, higher than those generally found for arc conditions. Certain peculiarities relating to the evaporation of electrode metal are described. In particular the presence of discontinuous evaporation was noticed, and it was found that different electrode metals showed considerable variations in their behaviour in this respect.

[1]  J. Craggs,et al.  Spectral variations of the intermittency effect for some panchromatic plates. , 1947, Journal of the Optical Society of America.

[2]  C. S. Pearsall,et al.  Physical Processes in the Recovery of TR Tubes , 1946 .

[3]  J. Meek,et al.  The emission of light from spark discharges , 1946, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[4]  G. Dieke,et al.  Spectral intensity measurements with photo-tubes and the oscillograph. , 1946, Journal of the Optical Society of America.

[5]  F. L. Jones.  Electrode Evaporation and the Electric Spark , 1946, Nature.

[6]  A. M. Kruithof.  The radial course of the populations of the energy levels in the column of an electric arc, and some relative transition probabilities in the spectra of Ba I and Ba II , 1943 .

[7]  J. A. Smit,et al.  The relative probabilities of transitions in the zinc atom , 1943 .

[8]  T. V. D. Broek,et al.  Determination of the relative transition probabilities of some triplet lines in the atomic spectra of calcium and strontium , 1943 .

[9]  L. Ornstein,et al.  The relative transition probabilities in the spectrum of magnesium , 1941 .

[10]  L. Loeb,et al.  The Mechanism of Spark Discharge in Air at Atmospheric Pressure. I , 1940 .

[11]  R. C. Mason.  Gas temperature and population of atomic levels in a carbon arc at low pressure , 1938 .

[12]  G. Langstroth,et al.  TRANSPORT OF MATERIAL IN SOURCES FOR SPECTROSCOPIC ANALYSIS , 1938 .

[13]  L. Ornstein,et al.  Determination of the relative transition-probabilities in the spectrum of cadmium , 1938 .

[14]  R. A. Sawyer,et al.  The Fifty-Three Electron Spectra of Caesium and Barium: Cs III and Ba IV , 1934 .

[15]  H. Brinkman,et al.  Der thermische mechanismus in der säule des lichtbogens , 1934 .

[16]  R. Ladenburg.  Dispersion in Electrically Excited Gases , 1933 .

[17]  O. S. Duffendack,et al.  Some Factors Affecting Action Cross Section for Collisions of the Second Kind between Atoms and Ions , 1933 .

[18]  O. Klein,et al.  Über Zusammenstöße zwischen Atomen und freien Elektronen , 1921 .

[19]  H. Kaiser,et al.  Über elektrische Funken und ihre Verwendung zur Anregung von Spektren , 1939 .

[20]  G. Langstroth,et al.  EXCITATION IN SOURCES FOR SPECTROSCOPIC ANALYSIS , 1938 .

[21]  O. S. Duffendack,et al.  Collisions of the Second Kind Between Magnesium and Neon , 1935 .

[22]  Allan C. G. Mitchell,et al.  Resonance radiation and excited atoms , 1934 .