Nascent rotational distributions of N2+(X 2Σg+) produced by electron-impact ionization of N2 in a supersonic beam

Takashi Nagata, Atsushi Nakajima, Tamotsu Kondow, Kozo Kuchitsu

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Abstract

Laser-induced fluorescence from nascent N2+(X 2Σg+) ions produced by electron impact on a N2 supersonic beam was observed. An analysis of the B 2Σu+-X 2Σ g+ (0,0) band shows that the rotational state distributions cannot be represented by a single Boltzmann function, higher N″ levels being overpopulated. Experimental and analytical efforts were made to minimize the influence of cascading and relaxation on the rotational distributions. The rotational energy of N2+ (X) thus estimated increases with decreasing electron energy from 2.26±0.16 meV at 300 eV to 4.24±0.27 meV at 25 eV. This trend is explained qualitatively in terms of angular momentum transfer through multipole electron-molecule interactions.

Original languageEnglish
Pages (from-to)6507-6512
Number of pages6
JournalThe Journal of Chemical Physics
Volume87
Issue number11
Publication statusPublished - 1987

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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