Elsevier

Physica

Volume 5, Issue 8, August 1938, Pages 777-784
Physica

Gas temperature and population of atomic levels in a carbon arc at low pressure

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Abstract

In a carbon arc in air at pressures from 250 mm to 10 mm, the intensities of the CN 3883 band and of certain lines of Ba and Zn, added in small amount to the anode, have been measured. From the band, the temperature of the gas was determined while from the lines, with the aid of transition probabilities measured at atmospheric pressure, the relative population of several excited states has been found. With decreasing pressure, the gas temperature did not change much, but the density of excited atoms exceeded the density expected in the thermal equilibrium by increasing amounts. It is probable electrons having energies above those corresponding with the energie distribution at the gas temperature are responsible for the increased excitation.

References (3)

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    H. Brinkman

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    (1937)
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