He I Photoelectron Spectroscopy(UPS) of Isotopic 18O2 Molecules
Wang Dian-Xun, Li Ying, Li Sheng, Chen Ben-Ming
Acta Phys. -Chim. Sin. . 1994, (09): 771 -773 .  DOI: 10.3866/PKU.WHXB19940901