Brandau C, Kozhuharov C, Müller A, Shi W, Schippers S, Bartsch T, Böhm S, Böhme C, Hoffknecht A, Knopp H, Grün N, Scheid W, Steih T, Bosch F, Franzke B, Mokler P H, Nolden F, Steck M, Stöhlker T, Stachura Z
Institut für Kernphysik, Justus-Liebig-Universität, D-35392 Giessen, Germany.
Phys Rev Lett. 2003 Aug 15;91(7):073202. doi: 10.1103/PhysRevLett.91.073202. Epub 2003 Aug 14.
The 2s(1/2)-2p(1/2) energy splittings DeltaE(L) of the lithiumlike ions 19779Au76+, 20882Pb79+, and 23892U89+ have been measured at the Experimental Storage Ring, utilizing low energy dielectronic recombination. The resonance energies in total 41 different 1s(2) 2p(1/2)nl(j(')) (n > or =20) autoionizing Rydberg states populated in the dielectronic capture process have been determined. The 2s(1/2)-->2p(1/2) excitation energies have been obtained by extrapolation of these resonance energies to the associated series limits n--> infinity. The combined analysis of the experimental data for all three ions yields DeltaE(L)=216.134(96) eV for Au76+, 230.650(81) eV for Pb79+, and 280.516(99) eV for U89+.
利用低能双电子复合，在实验储存环中测量了类锂离子(^{197}{79}\text{Au}^{76 +})、(^{208}{82}\text{Pb}^{79 +})和(^{238}{92}\text{U}^{89 +})的(2s{1/2}-2p_{1/2})能量分裂(\Delta E(L))。确定了在双电子俘获过程中总共(41)个不同的(1s^{2}2p_{1/2}nl(j^{\prime}))（(n\geq20)）自电离里德堡态的共振能量。通过将这些共振能量外推到相关系列极限(n\rightarrow\infty)，得到了(2s_{1/2}\rightarrow2p_{1/2})的激发能量。对所有三种离子的实验数据进行综合分析，得到(\text{Au}^{76 +})的(\Delta E(L)=216.134(96)\text{ eV})，(\text{Pb}^{79 +})的(\Delta E(L)=230.650(81)\text{ eV})，(\text{U}^{89 +})的(\Delta E(L)=280.516(99)\text{ eV})。
