02123nas a2200205   4500008004100000022001400041245011700055210006900172260008100241300001100322490000700333520133300340653002401673653001601697653002401713100001901737700001801756700001601774856012701790       2014                        eng d  a0953-407500aRelativistic spectroscopy of plasma-embedded Li-like systems with screening effects in two-body Debye potentials0 aRelativistic spectroscopy of plasmaembedded Lilike systems with   aTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLANDbIOP PUBLISHING LTDcSEP  a1757010 v473 a<p>The spectroscopic properties of Li atoms and Li-like Ca and Ti ions in the plasma environment are investigated using a relativistic coupled-cluster (RCC) method. Assuming that the plasma is of low density and very hot, we consider the Debye model with two approximations to account for the screening effects: (i) in the nuclear potential alone and (ii) in both the nuclear and the electron-electron interaction potentials. Also, calculations for the energies and the lifetimes of the atomic states are carried out for plasma-free systems to check their accuracy, after which they are investigated in the plasma environment. It is observed that screenings in the electron-electron interaction potentials stabilize the systems more than when the screenings are present only in the nuclear potential. Similarly, the blue and red shifts in the Delta n = 0 and Delta n not equal 0 transition lines (with the principal quantum number n) of the Li-like ions observed in the (i) approximation are altered in the (ii) approximation. The level crossings among the energy levels are observed for large screening effects and are found to be prominent in the states of higher orbital angular momentum. The lifetimes of many low-lying states of the allowed transitions are estimated by considering different plasma screening strengths.</p>10aatomic Spectroscopy10aDebye model10arelativistic method1 aDas, Madhulita1 aSahoo, B., K.1 aPal, Sourav  uhttps://library.ncl.res.in/content/relativistic-spectroscopy-plasma-embedded-li-systems-screening-effects-two-body-debye-0