抄録
As a confirmative study on electron impact emission of the second positive band group (2PG) of N2 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 C3Πu (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 cm2. 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 N2 pressure and for which estimated errors are given, a weighted averaging value is calculated to be (11.0±0.7)×10−18 cm2 as a recommended emission cross section for 2P(0,0) band.
