Abstract
Spectra of pyrotechnic flares composed of magnesium–sodium nitrate
mixtures were studied to characterize the feature responsible for their high
luminous efficacy. The major component of spectral radiant power appears as a
continuum, with a deep minimum at the sodium resonance-line position and broad
maxima as much as 100 Å on either side. This resonance-line continuum is
shown to be a general property of magnesium–alkali nitrate flares. The
separation of the maxima decreases with decreasing ambient pressure and with
decreasing cross-sectional area of the flare.
© 1970 Optical Society of America
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