Vibrationaly resolved photofragment spectroscopy of FeO~+

摘要

We report the first vibrationally resolved spectroscopic study of FeO~+. We observe the 0 <- 0 and 1 <- 0 bands of a ~6#SIGMA# <- X ~6#SIGMA# transition at 28 648.7 and 29 311 cm~(-1). Under slightly modified source conditions the 1 <- 1 transition is observed at 28 473 cm~(-1). In addition to establishing an upper limit D_0~o(Fe~+-O) <= 342.7 kJ/mol, our results give the first experimental measurements of the vibrational frequencies in both the ground state, v"_0 = 838 +- 4 cm~(-1), and the excited electronic state, v'_0 = 662 +- 2 cm~(-1). Partially resolved rotational structure underlying the vibrational peaks has been analyzed to measure the predissociation lifetime and estimate the change in molecular constants upon electronic excitation.