Experimental Study Of Branching Fractions And Oscillator Strengths Of Europium Atom Levels

For thousands of years, mankind has been exploring the mysteries of the universe,it is mankind’s endless yearning in the distant stars. Today, scientists can only rely onspectral data to collect and analyze the nucleosynthesis process of elements incelestial bodies, which will determine the age of the universe and the elementchemical abundance. In order to analyze planetary bodies spectral data, radiationparameters of atoms and ions is essential. Oscillator strength derived by lifetimecombined with branching fractions is one of the most basic radiation parameters ofastronomical spectra. In recent years, with the study of chemical special star (CP)development, we need more comprehensive radiation parameters of lanthanide atomicand ionic. It was found that the lanthanides elements have relatively high abundancein some CP stars. So the Eu is an excellent material in the study of fast neutronelement evolution. In this context, we carry out a study to measure the transitionbranching fractions and oscillator strengths atomic level of europium. At the sametime, Zhang et al measured the radiative lifetime of upper level region which rangedfrom27852.90cm1to45106.83cm1, however, it lacks the corresponding transitionbranching fractions data. We can not be directly obtain the value of the oscillatorstrength.Based on this, we measured64Eu I transition lines branching fractions of thecorresponding wavelength range. Combined branching fractions with radiativelifetimes to deduce transition probabilities and oscillator strengths of spectral lines.We compared some experimental results of Eu I spectrum with data from Den Hartoget al, it is found that there data consistent with the results reported in the literature.There are56spectrum lines which are the first reported. We carefully analyze the errors generated in the experiment and all data errors are less than10%, therefore ourexperimental results with high accuracy. These data can be directly applied to spectralanalysis of celestial bodies. Meanwhile, they are very important scientific basis in thestudy of plasma physics plasma physics, nuclear fusion physics and many otherimportant areas.