ris 4: A program for relativistic isotope shift calculations

Electronic isotope shift factors for the Ir 5d76s24F9/2Schiffmann1, Godefroid2 2021Journal of Quantitative Spectroscopy and Radiative Transfer6100View full textAdd to dashboardCite

“…The MS introduces the electronic factor K MS ,k = K MS ,u − K MS ,l for the transition line k between an upper atomic state u and a lower atomic state l , which results from the evaluation of the matrix element of the atomic two-body operators described in Ref. [12] . The frequency mass shift between two isotopes A and A' of mass M and M', respectively, is given by…”

“…In the MCDHF framework, the field shift has been reformulated recently [12] and coded in a new module, RIS4, fully compatible with the Grasp packages [11,19] . As fully detailed in this work, its expression…”

“…As suggested in Ref. [12] , an intermediate solution is to include the effect of a varying electronic density ( ved ) (introduced in Eq. (10) ) to evaluate the FS, without considering higher order nuclear moments.…”

Analytic response relativistic coupled-cluster theory: the first application to indium isotope shifts

“…It is not possible to estimate these contributions in the EVE and AR approaches without defining suitable operators for them, however they can be determined satisfactorily by the FF procedure (e.g. see [44]). Since the leading order FS contributions are very small compared to the NMS and SMS contributions in the ISs of the considered transitions, higher-order radial moment contributions are significantly smaller than the accuracy of the present work.…”

Изотопические Сдвиги Уровней Энергии В Гелиеподобных Многозарядных Ионах

“…Как правило, использование формул (8), (9) является достаточным для достижения требуемой точности. Однако в случае большого различия радиусов ядер могут оказаться важными и разности более высоких моментов зарядового распределения [17,18]. В этом случае расчеты могут быть выполнены посредством прямого вычисления разности энергий связи для двух изотопов.…”