Absolute emission cross section forN2+(3914 Å) for protons incident onN2gas

Abstract

Absolute cross sections for the emission of the 3914-Å radiation of the ${\mathrm{N}}_2^{+}$ first negative system have been measured for protons incident on a gaseous nitrogen target. The energy range covered was 12-100 keV. The energy dependence of the data presented is somewhat different from most previously published data. A possible energy-dependent source of error that may have occurred in previous measurements is discussed. In the present experiment this error should have been minimized by the use of a calorimeter rather than a Faraday cup to measure incident-beam current.