Laser-induced Fluorescence Spectroscopy of Uranium Monofluoride

The laser-induced fluorescence excitation spectra of uranium monofluoride have been recorded in the range of 17000 - 19000 cm^-1 using two-dimensional spectroscopy. High resolution dispersed fluorescence spectra and time-resolved fluorescence spectroscopy were also recorded. Three rotationally resolved bands were intensively analyzed, and all bands were found to be derived from the ground state X(1)4.5 with a rotational constant of 0.23421 cm^-1 . The low-lying electronic states were observed near 435 and 651 cm^-1 in the dispersed fluorescence spectra, which were assigned as \Omega' =3.5 and 2.5, respectively. The vibrational constants for the X(1)4.5 and X(1)3.5 states were calculated. The branching ratios of the dispersed fluorescence spectra for the 18.623.5, 17.724.5, and 17.654.5 states were reported. Radiative lifetime of 332(9) ns, 825(49) ns, and 433(15) ns for the 18.623.5, 17.724.5, and 17.654.5 states were obtained by fitting the time-resolved fluorescence spectroscopy, respectively. Transition dipole moments were performed using the branching ratios and the radiative lifetimes.