AbstractsPhysics

1. A modified Lo Surdo tube has been used to investigate Stark effect in metals. 2. Stark effect has been observed in copper in the region 6500-2600 and in nickel for the region 4500-2600 A.U. The maximum field strengths were in excess of 250 kV./cm. 3. Eighty-one lines were photographed in nickel, all of which were found to be undisplaced. 4. Thirty-five copper lines were photographed, of which 17 are displaced. The Stark effect increases fairly rapidly with increasing term number. 5. Several corrections are made to the observations of previous investigators in this field. 6. Displaced and undisplaced levels are classified for copper and displacements are predicted for lines not photographed. 7. Undisplaced levels for nickel are classified. The existance of a new odd 2P term for Cu is suggested. 9. Several lines in the copper arc spectrum are shown to be due to the small electric field existing in the arc. 10. It has been found that the intensity of the spectra obtained is a function of the diameter of the cathode dark space, and, in order to bring out important lines in copper, nickel and silver a cathode diameter of 3 mm. was required.