ALL-OPTICAL TRIPLE-RESONANCE SPECTROSCOPY OF THE A-(1)SIGMA(-7(2)()(U) STATE OF LI)

The A 1 Sigma(u)(+) state of Li-7(2) has been studied using all optica l triple resonance spectroscopy. Vibrational levels v=27-62 and rotati onal levels ranging from J=0 to 27 have been observed. This represents a region between previous data from single photon experiments and new data from cold atom photoassociative spectroscopy. Our data was fit t o a Dunham expansion and the resulting molecular constants reproduce m ost observed energies to within 0.050 cm(-1). A Rydberg-Klein-Rees pot ential curve has also been constructed and the calculated eigenvalues are in good agreement with observed energies. (C) 1996 American Instit ute of Physics.