Hyperfine Structure Constants Of Au ? And Au ? Energy Levels

In the initial stages of understanding the atomic spectrum,the humanity only consider the nucleus as a point charge Ze with a certain mass,so as to obtain the coarse structure of the atomic spectrum;after considering the spin effect of electrons,people have obtained the fine structure of the spectrum;and with the development of the spectrometer technology(the resolution has reached above E^-9),the hyperfine structure?referred to as HFS?has been increasingly recognized.The interaction of the magnetic dipole and electrical quadrupole moment of the nucleus with electrons makes the atom produce HFS.Experimental measurements and theoretical studies of HFS constants not only help people to understand the properties of atomic nuclear charge,current distribution,nuclear deformation,etc,but are also helpful to better consider the electronic correlation effect and verify the accuracy of the calculation of the electronic wave function.The high-resolution celestial spectrum contains a large number of HFS that cannot be ignored,and the HFS constants are also important atomic data for the accurate analysis of celestial spectra.Over the years,with the rapid development of astronomical observation means,a large number of unprecedented high-resolution,high signal-to-noise ratio of celestial spectrum has been obtained.The astronomical spectral contains HFS with a wide variety of spectral lines,and many accurate HFS constants are needed to analyze these spectra.At present,the data of HFS constants of the gold atom and the gold monovalent ion?Au I,Au II?energy levels are still very imperfect.From 1953 to 2009,a total of 10 international research groups measured or calculated the HFS constants for only 6 Au I energy levels.As for the Au II,only in 1988,the HFS constants of 9energy levels were measured by Bouazza et al.For the currently known 61 Au I and37 Au II energy levels,it is clear that there are still many HFS constants of the energy levels to be determined.In view of this,this paper uses the Fourier transform spectra of Au element obtained from the database of the National Solar Observatory?abbreviated as NSO?of the United States,and uses the spectral analysis program developed by ourselves based on the atomic and ion HFS theory and the least squares method to conduct Voigt linear simulation analysis of the emission spectra of Au I and Au II.The magnetic dipole HFS constant A value and the electric quadrupole HFS constant B value of the 26 Au I energy levels between 37358.991⁷3051 cm^-11 and the 8 Au II energy levels between 29621.249¹20257.12 cm^-11 are determined more accurately.And the constants value of HFS of other energy levels cannot be determined because there is no transition line in the spectrum.The error of A constant is mostly less than15%;in the hyperfine interaction,the electric quadrupole interaction is generally much smaller than the magnetic dipole interaction,so the error of B constant is large,and some even reach more than 50%.To our knowledge,24 Au I levels and 7 Au II levels of these results are reported for the first time.For the three reported HFS constant results,the results obtained in this paper are in good agreement with the results reported by the predecessors within the error range.