Knowledge Bank

“A systematic survey has been made of the spectra of the afterglows resulting from electric discharges in mixtures of nitrogen and oxygen. The spectra have been photographed for mixtures ranging from 100% nitrogen to 100% oxygen, pressures from 1 to 5 mm, flow rates from 2 to $20cm-1$/sec, and as a function of time after the discharge. The spectrum range covered is from 3000 to 11,000 A, making use of both a prism spectrograph (f/4) and a grating spectrograph (f/0.8). Curves have been prepared to show the relative variations of the individual spectral features as function of the various parameters.”