Experimental Study Of Branching Fractions, Transition Probabilities And Oscillator Strengths Of Some Levels In Crâ… 

Historically, humans have never stopped thinking of the universe. The vast sky charm to provide the power for people to further explore the mysteries of the universe. The human understanding of the universe is accomplished by means of receiving cosmic radiation. At present, for the analysis of the cosmic rays, scientists need to have a spectrum data as the foundation. According to accurate spectral data analysis, scientific workers can get a star element abundance, atmospheric parameters, etc., so the elements of radiation parameters are indispensable basic data which are needed to explore outer space. Transition probability and oscillator strength are important parameter of the cosmic radiation, using the transitions branching ratios and radiative lifetime data to derive transition probabilities and oscillator strength is one of and most reliable method.Stellar radiation area contains a large number of iron-peak spectral lines. Iron-peak element spectral lines can analysis element type in the stellar radiation layer. Chromium is a member of iron-peak group(Z=24), measuring the chromium element spectrum of the star data as reference is important.Our experiment measured chromium emission line of hollow cathode lamp by used the high resolution grating spectrometer. We measure 23 upper level to the low level of transition branching ratio, a total of 100 lines, and used the previous life data measured in former work of our group to calculate the corresponding transition probability and the oscillator strength. There are 54 spectrum lines which are the first reported. In order to get the accurate results, we measured the first branch of the hollow cathode lamp carrier gas(Ar) than compared with previous measurements and the comparison results show that the experimental instrument was corrected to the best state. Secondly analyzed the experimental results, draw the transition probability analysis diagram to compare with previous results, proved that the experimental data measured is reliable. The last part of the paper analyzes the factors causing error, which mainly have three aspects: life error, instruments and data fitting error.The results of this paper enriches the chromium atoms spectral data, can help people to further study the chromium atomic structure, and have important reference on astrophysics, plasma physics and other related disciplines.