Not CN rate of dissociation

Forums Comets distribution of C2 Not CN rate of dissociation

Robin Leadbeater

Is CN also broken down by sunlight, though at perhaps a slower rate than C2 ?”

Actually, answering my own question  it looks like that cannot be the explanation as CN is seen  widely distributed in the cross section  through the tail of 2020 F3. Any ideas of what is going on?