Estimation of Emission Cross Section for CH⁺(A¹Π-X¹Σ⁺: 419.0--441.0, nm) Produced by Electron Impact of CH₄ Using Spectral Simulation Technique

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Emission cross sections for CH⁺(A¹Π-X¹Σ⁺) produced by single electron impact of CH₄ are estimated at 100 and 400, eV by subtracting the calculated band intensities for CH(A²Δ-X²Π) from the experimentally measured band spectra. Vibrational and rotational temperatures are analyzed for CH molecule in the A²Δ state by fitting calculated band intensities assuming the Boltzman distributions in the upper electronic state to experimental ones at 17, 28, 100 and 400, eV. Rotational population distribution at 17, eV is quite different from others.