# NITROGEN ABSORPTION COEFFICIENTS IN THE 580-1000 {\AA} WAVE LENGTH REGION

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 Title: NITROGEN ABSORPTION COEFFICIENTS IN THE 580-1000 {\AA} WAVE LENGTH REGION Creators: Huffman, R. E.; Tanaka, Y.; Larrabee, J. C. Issue Date: 1963 Publisher: Ohio State University Abstract: “A photoelectric scanning technique, based on an intense, stabilized Hopfield helium-continuum background light source, has been used to measure $N_{2}$ absorption coefficients. The measurements have been done with a bandwidth of 0.5{\AA} over a range of pressures using an absorption cell placed behind the exit slit of a vacuum monochromator. Corrections were made for the pressure gradient m the flow absorption cell, the scattered light and fluorescence. From 1000A to 796A, the first ionization threshold $(N_{2}^{+} X{^{2}} \Sigma_{g}^{+})$, a number of sharp, intense bands are present with no evidence of a dissociation continuum. Below 796{\AA}, the ionization continuum appears to rise slowly, but it is difficult to observe because, the region to the nest ionization threshold at 742{\AA} ($(N^{+}_{2} A{^{2}}\Pi_{u})$) is crowded with many strong pre-ionized bands. Between 742{\AA} and the threshold of the state at 661 {\AA} the ionization continuum increases from roughly 400 to $780\;cm^{-1}$, and the intense, pre-ionized Hopfield Rydberg series is the dominant feature. At 661 {\AA}, the absorption coefficient rises abruptly to $980\;cm^{-1}$ and continues at approximately this constant value to 580 {\AA}.” Description: Author Institution: Air Force, Cambridge Research Laboratories Bedford URI: http://hdl.handle.net/1811/8238 Other Identifiers: 1963-G-9