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More extensive and much more precise spectroscopic data on the excitation of the G Ou+ state have led to an extended and improved analysis of the G Ou+ from A Og+ excitation band, yielding corrected assignments of vibrational components and revised values omega e=88 cm-1, omega ex epsilon =0.28 cm-1 for the G Ou+ state which supersede those published recently.

The G0u+ state in Hg2 'excimer' molecules (correlated with the 61P1 atomic state) was populated by stepwise excitation through the metastable A0g+ state, and the fluorescence emitted in the 0u+ to X0g+ decay was recorded with a spectrometer and a transient digitiser. The time evolution of the fluorescence indicated a very short ( approximately=1 ns) lifetime of the 0u+ excimer. The band corresponding to the v"=0(A0g+) to v'=0(G0u+) transition was identified in absorption and the energy separation of the two potential wells was determined as was the wavelength of the UV fluorescence emitted in the decay of the v'=0 level of the G0u+ state to the repulsive X0g+ ground state. A determination was made of the vibrational frequency omega 'e and the anharmonicity omega 'e chi 'e of the 0u+ state.