Theoretical study of the spectroscopic properties of mendelevium (Z=101)

Abstract

Using recently developed version of the configuration interaction method for atoms with open shells we calculate electron structure and spectroscopic properties of the mendelevium atom (Md, Z = 101). These include energy levels, first and second ionisation potentials, electron affinity, hyperfine structure and electric dipole transition amplitudes between ground and low lying states of opposite parity. The accuracy of the calculations is controlled by performing similar calculations for lighter analog of mendelevium, thulium atom and comparing the results with experiment and other calculations. The calculations for Md are to address the lack of experimental data and help in planing and interpreting the measurements.

Calculation of Polarizabilities for Atoms with Open Shells

“…The CIPT method described above was used in a number of calculations for many-electron atoms (see, e.g., [16,17]) proving its usefulness. In present paper we go further applying similar approach to Equation (7).…”

“…Here again neglecting the off-diagonal matrix elements in D y leads to simple structure of the (17) the partial sum ( 8) is calculated by…”

“…In the approximations used in these works the polarizabilities of ground and clock states were the same. The electronic structure of Tm was studied in [17] the way similar to what we did for Er. However, polarizabilities were not considered.…”

Recent progress in laser spectroscopy of the actinides

“…More recently, additional levels (orange) were reported for Ac [53,54], Th [55,56,57], Pa [58], U [59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75], Pu [53,75,76], Am [76,77], Es [78], Fm [40,79,80] and No [81,82]. In addition, theoretical predictions are shown (blue) for Ac [83], Fm [84,78], Md [85], No [86,87,88,89,90,91,92] and Lr [93,94,88] In general, the atomic structure of most actinide elements is only partially known due to the scarcity of isolated material and the lack of abundant isotopes with suitable half-lives.…”

“…Calculations of atomic transitions of heavy elements including isotope shifts were performed in an astrophysical context to enable the search for atomic transitions in star light to determine the elemental abundances [104]. Progress in the theoretical treatment of open shells enables now calculation of elements with partly filled 5f shells such as Fm [84], Md [85] and for elements with open d-shells [105,106]. At present, calculations for most elements are existing [107,108,109,83,89,110,111,112,113,114] with some special emphasis on Og [115,116],…”