We simulate the photoelectron spectrum of CH−2 using the known bending potential functions of CH2 in the X̃ 3B1 and ã 1A1 states, together with a bending potential function and temperature for CH−2 in the X̃ 2B1 state that are adjusted in order to fit the experimental spectrum. We find that in order to reproduce the spectrum we must have a CH−2 temperature of about 2500 K and a singlet–triplet separation in CH2 of 3250±200 cm−1 (0.40±0.02 eV or 9.3±0.6 kcal/mol). This leads to a value for the electron affinity of X̃ state CH2 of 0.65±0.02 eV. In the simulation we include rotational levels with J (or N) up to 20, which means that over 500 000 rovibronic transitions are involved.
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1983
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