The spin–forbidden radiative decay process CH(a 4Σ−)→CH(X 2Π) is studied using the full Breit–Pauli spin–orbit Hamiltonian and multireference configuration interaction wave functions comprised of 250 000–350 000 configuration state functions. The radiative lifetime of the (a 4Σ−,v,N,Fi)→X 2Π transitions were determined in a Hund’s case (b) approximation. The pure radiative lifetimes are found to be quite long, on average being 12, 10, and 8 s for v=0,1,2, respectively.
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