Keywords: SpectroscopyResearch 016.jpg Plate A shows a pure nitrogen spectrum Plate B shows how the spectral fearures are affected by the addition of 1 percent oxygen Not only did this small amount of ozygen introduce additional bands but it greatly reduced the intensity of the primary transition Short lines indicated a calibration spectrum National Institute of Standards and Technology 8/4/1959 National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology Spectroscopy |