Measurement Of Branching Ratios And Deduction Of Oscillator Strength For Highly Excited Levels Of Sn I

Useing the excutive data of oscillator strengths, we can analyse the astronomical spectroscopy to obtain the chemical composition of interstellar matter , and then deduce the origin and the evolement of universe. This is the most important problem of the research of astrophysics. By means of physical method to analyse the electromagnetic radiation from celestial body, we can get various of physical parameters. According to these parameter with the physical theory, we could illuminate the physical course and the evolution history of the celestial body. This is the task of both observational astrophysics and theoretical astrophysics, and the spectroscopy determination and corresponding analyse for these spectroscopy are consider to be an useful method in the research. Meanwhile, accurate experimental data for transition probability and oscillator strengths are all important physical parameters which can be used for checking all kinds of approximate theorys, especially for the atoms which have big Z. Comparing the experimental and theoretical results, we can check the suit condition and approximation degree for the theory. It is important scientific evidence to improve the original theory and put forward a new theory. This paper is performed for the above situation.In this paper, we determined branching fractions with 11 even-parity energy levels for 5pnp (n = 7, 10–13) and 5pnf (n = 4, 6, 7) series, and together with 2 odd-parity energy levels in 5p6s and 5p6d configurations. Combining with the lifetimes data, we determine the oscillator strength for these energy levels. We measured 32 data of branching fractions in atom Sn, all the results are listed in table 4.1. From table 4.1, we can find that a good agreement between experimental and theoretical results have been achieved. We use the published lifetime data from Ying Zhang et al in our calculations for transition probability and oscillator strengths. The calculated results are all list in table 4.2. Most of them are new experimental data, which can make the atomic data more completely and give more help for people to investigate the astrophysical elements.There are a mass of measurement for oscillator strengths in neutral atoms a have been performed, but the accurate oscillator strengths data is desired in astrophysics until now.Meanwhile, accurate experimental data for transition probability and oscillator strengths are all important physical parameters which can be used for checking all kinds of approximate theorys, especially for the atoms which have big Z. Comparing the experimental and theoretical results, we can check the suit condition and approximation degree for the theory.Based on this work, there are still numerous work need to be done. Therefor, the measurement of these with other important data received considerable attention in physical scientific research all the time. With the development of experimental technology, especially for the spectroscopy technology, all the experimental data will be replaced with higher precision.