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In present study an accurate ab initio potential energy curve of $CH(X^2\Pi)$ has been determined at the complete basis set limit. The core-valence corrections and relativistic corrections including scalar relativity and spin-orbit coupling are determined. The vibrational and rotational levels are calculated based on fitted potential energy curve. Total 19 vibrational levels are found for $^{13}CH$ ground state, and comparing with available experimental data, the deviation is less than 15 $cm^{-1}.$ The dissociation energy is calculated within 50 $cm^{-1}$ of the experimental value 29358 $cm^{-1}.$ The $A^2Δ$ - $X^2\Pi$ electric transition dipole moment function is calculated, and the high-temperature fluorescence spectra arising from $A^2Δ$ - $X^2\Pi$ transition are simulated.
}, issn = {2079-7346}, doi = {https://doi.org/10.4208/jams.061112.081212a}, url = {http://global-sci.org/intro/article_detail/jams/8247.html} }In present study an accurate ab initio potential energy curve of $CH(X^2\Pi)$ has been determined at the complete basis set limit. The core-valence corrections and relativistic corrections including scalar relativity and spin-orbit coupling are determined. The vibrational and rotational levels are calculated based on fitted potential energy curve. Total 19 vibrational levels are found for $^{13}CH$ ground state, and comparing with available experimental data, the deviation is less than 15 $cm^{-1}.$ The dissociation energy is calculated within 50 $cm^{-1}$ of the experimental value 29358 $cm^{-1}.$ The $A^2Δ$ - $X^2\Pi$ electric transition dipole moment function is calculated, and the high-temperature fluorescence spectra arising from $A^2Δ$ - $X^2\Pi$ transition are simulated.