Abstract

Quantitative measurements on the absorption coefficient of air have been made for about three hundred and fifty points between 380 and 1600A. Because of difficulties in maintaining a constant intensity with extreme ultraviolet light sources, it was necessary to use a many-line spark source rather than a continuous spectrum, with the result that much of the fine structure of the absorption bands has been lost. Photographic measurements with oiled plates show strong absorption between 1600A and 1300A, a quite transparent region between 1300A and 1000A, and a very highly absorbing group of bands at the shorter wave-lengths. Although these bands below 1000A are poorly resolved, a wealth of fine structure is evident.

© 1940 Optical Society of America

An Improved High Speed Recording Spectrophotometer

George R. Harrison and Edward P. Bentley
J. Opt. Soc. Am. 30(7) 290-294 (1940)

An Intensity-Scale Monochromatic Sensitometer*

Charles H. Evans
J. Opt. Soc. Am. 30(3) 118-127 (1940)

Computation of Transmission Factors of Ultraviolet Radiation Through Water

Frank Benford
J. Opt. Soc. Am. 30(3) 133-135 (1940)

Homochromatic Spectrophotometry in the Extreme Ultraviolet

George R. Harrison and Philip A. Leighton
J. Opt. Soc. Am. 20(6) 313-330 (1930)

The Zeeman Effect in the Rhodium Arc Spectrum at High Fields

Julius P. Molnar and William J. Hitchcock
J. Opt. Soc. Am. 30(11) 523-535 (1940)