A high resolution study of the transitions 4 f 7 6 s 2 →4 f 7 6 s 6 p in the Eu I-spectrum

Eight transitions in the Eu I-spectrum connecting the ground state with configuration 4f7 6s2 with states of the configuration 4f7 6s6p were studied with high resolution laseratomic-beam spectroscopy. CW dye lasers operating in the wavelength regions 435–470 nm and 560–630 nm were used for this study. New data for the hyperfine structure in153Eu were obtained as well as new and more accurate values for the isotope shifts between151Eu and153Eu. The existing data for the hyperfine structure in151Eu were reproduced with an exception for the levelz6P7/2.