Electron Impact Emission of N2 2P(v',v'') Bands Studied under Single-Collision Condition

Abstract

As a confirmative study on electron impact emission of the second positive band group (2PG) of N 2 molecules, absolute emission cross section for the 2P(0,0) band and intensity ratios 2P(v',v”)/2P(0,0) have been measured. The absolute measurement has been made directly using a standard light source. From these results, the cross sections for excitation of C 3 Π u (v'=0, 1) vibrational states have been determined. Emphasis was placed on measurements under single-collision condition. Experimental errors have been assessed in some detail. The absolute 2P(0,0) cross section measured has the peak value of (11.1±1.1)×10 -18 cm 2 . This value is in good agreement with measurements reported recently by other two research groups. From the present and the two recent results, which were measured at low N 2 pressure and for which estimated errors are given, a weighted averaging value is calculated to be (11.0±0.7)×10 -18 cm 2 as a recommended emission cross section for 2P(0,0) band.