Reference Label	Details
Niu 1993a	B. Niu, Y. Bai, and D. A. Shirley, J. Chem. Phys. 99, 2520-2532 (1993) High Resolution Photoelectron Spectroscopy and Femtosecond Intramolecular Dynamics of H2CCO+ and D2CCO+
Niu 1993b	B. Niu, Y. Bai, and D. A. Shirley, Chem. Phys. Lett. 201, 217-222 (1993) High Resolution He Ialpha Photoelectron Spectroscopy of H2CCO and D2CCO using Supersonic Molecular Beams