Orts R Soria, Harman Z, López-Urrutia J R Crespo, Artemyev A N, Bruhns H, Martínez A J González, Jentschura U D, Keitel C H, Lapierre A, Mironov V, Shabaev V M, Tawara H, Tupitsyn I I, Ullrich J, Volotka A V
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
Phys Rev Lett. 2006 Sep 8;97(10):103002. doi: 10.1103/PhysRevLett.97.103002. Epub 2006 Sep 6.
The relativistic recoil effect has been the object of experimental investigations using highly charged ions at the Heidelberg electron beam ion trap. Its scaling with the nuclear charge Z boosts its contribution to a measurable level in the magnetic-dipole (M1) transitions of B- and Be-like Ar ions. The isotope shifts of 36Ar versus 40Ar have been detected with sub-ppm accuracy, and the recoil effect contribution was extracted from the 1s(2)2s(2)2p 2P(1/2) - 2P(3/2) transition in Ar13+ and the 1s(2)2s2p 3P1-3P2 transition in Ar14+. The experimental isotope shifts of 0.00123(6) nm (Ar13+) and 0.00120(10) nm (Ar14+) are in agreement with our present predictions of 0.00123(5) nm (Ar13+) and 0.00122(5) nm (Ar14+) based on the total relativistic recoil operator, confirming that a thorough understanding of correlated relativistic electron dynamics is necessary even in a region of intermediate nuclear charges.
相对论反冲效应一直是海德堡电子束离子阱中使用高电荷离子进行实验研究的对象。它与核电荷Z的标度关系将其对类硼和类铍氩离子磁偶极（M1）跃迁的贡献提升到了可测量的水平。已以亚百万分之一的精度检测到36Ar与40Ar的同位素位移，并从Ar13 +中的1s(2)2s(2)2p 2P(1/2) - 2P(3/2)跃迁以及Ar14 +中的1s(2)2s2p 3P1 - 3P2跃迁中提取了反冲效应的贡献。0.00123(6) nm（Ar13 +）和0.00120(10) nm（Ar14 +）的实验同位素位移与我们目前基于全相对论反冲算符得出的0.00123(5) nm（Ar13 +）和0.00122(5) nm（Ar14 +）的预测结果一致，这证实了即使在中等核电荷区域，对相关相对论电子动力学的透彻理解也是必要的。
