Excitation Functions of the Auroral Bands of N2+ and the Comet-Tail Bands of CO+, Excited by Electron Impact

Details Excitation Functions of the Auroral Bands of N2+ and the Comet-Tail Bands of CO+, Excited by Electron Impact Excitation Functions of the Auroral Bands of N2+ and the Comet-Tail Bands of CO+, Excited by Electron Impact

Oct 1937

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1937phrv...52..698b&link_type=abstract

Physical Review, vol. 52, Issue 7, pp. 698-702

Physics

3

Scientific paper

The excitation functions of the auroral bands of N2+ and the comet-tail bands of CO+, excited by electron impact, have been determined by the method of photographic intensitometry. A discharge tube is described in which electrons were accelerated from three filaments into the inside of a hollow cylindrical grid where the discharge took place. The discharge tube was operated at a pressure of 0.001 mm Hg with an electron current of 25 ma. The mean free path of the electrons was large in comparison to the interelectrode distances. It was found by probe electrode measurements that the "transparency" of the grid to electrons from the filaments diminished with the voltage for voltages less than 150 volts. Because of this effect it was necessary to correct the intensity measurements to correspond to a constant excitation current. The intensities of the 4018 and 4271A bands of CO+ and the 3914 and 4278A bands of N2+ were measured. The excitation functions that were obtained rise rapidly from zero at the excitation potential to sharp maxima at 2.5 times the excitation potential, then diminish rapidly in an exponential fashion. The functions for N2+ and CO+ are very similar and are regarded to be representative of the general type of excitation function associated with the excitation of the electronic states of these ionized molecules by single electron impacts.

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