The laser-induced fluorescence excitation spectra of uranium monofluoride have been recorded in the range of17000-19000 cm^(-1) using twodimensional spectroscopy.High resolution dispersed fluorescence spectra and time...The laser-induced fluorescence excitation spectra of uranium monofluoride have been recorded in the range of17000-19000 cm^(-1) using twodimensional 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?′=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[18.62]3.5,[17.72]4.5,and[17.65]4.5 states were reported.Radiative lifetime of332(9)ns,825(49)ns,and 433(15)ns for the[18.62]3.5,[17.72]4.5,and[17.65]4.5 states were obtained by fitting the time-resolved fluorescence spectroscopy,respectively.Transition dipole moments were performed using the branching ratios and the radiative lifetimes.展开更多
基金supported by the National Natural Science Foundation of China(No.21903050)。
文摘The laser-induced fluorescence excitation spectra of uranium monofluoride have been recorded in the range of17000-19000 cm^(-1) using twodimensional 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?′=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[18.62]3.5,[17.72]4.5,and[17.65]4.5 states were reported.Radiative lifetime of332(9)ns,825(49)ns,and 433(15)ns for the[18.62]3.5,[17.72]4.5,and[17.65]4.5 states were obtained by fitting the time-resolved fluorescence spectroscopy,respectively.Transition dipole moments were performed using the branching ratios and the radiative lifetimes.
