Reference Label	Details
Engelking 1981	P. C. Engelking, R. R. Corderman, J. J. Wendoloski, G. B. Ellison, S. V. ONeil, and W. C. Lineberger, J. Chem. Phys. 74, 5460-5473 (1981) Laser Photoelectron Spectroscopy of CH2-, and the Singlet-Triplet Splitting in Methylene