Influence of pressure on the relative population of the two lowest vibrational levels of the C 3 Πu state of nitrogen for electron beam excitation |
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| Authors: | A. Morozov T. Heindl J. Wieser R. Krücken A. Ulrich |
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| Affiliation: | 1. College of Physics and Information Engineering, Henan Normal University, Xinxiang, 453 007, P.R. China
2. College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang, 464 000, P.R. China
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| Abstract: | Continuous and pulsed 12 keV electron beams were used to excite nitrogen within a gas cell at pressures ranging from 10 to 1400 hPa. The pressure dependence of the ratio of photon fluxes for emission from vibrational levels v'=0 and 1 of the C 3Π u state has been studied. The results confirm the presence of a collisional excitation mechanism populating v'=0, 1 in addition to electron impact excitation. Rate constants of (1.27 ±0.04)×10-11 cm3s-1 [ v'=0] and (2.68 ±0.08)×10-11 cm3s-1 [ v'=1] were measured for C 3Π u quenching by ground state nitrogen. For electron beam conditions relative excitation efficiencies of 1:0.59:0.22 for vibrational levels 0, 1 and 2 were calculated. The recorded flux ratios are compared with the predictions given by a vibrational relaxation model. |
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| Keywords: | 34.80.Gs Molecular excitation and ionization by electron impact 33.70.Fd Absolute and relative line and band intensities 33.50.Hv Radiationless transitions, quenching |
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