M1 and E2 decay-dependent lifetime of the lowest 1S0 level in C-like ions up to Ne4+ measured at a heavy-ion storage ring
M1 and E2 decay-dependent lifetime of the lowest 1S0 level in C-like ions up to Ne4+ measured at a heavy-ion storage ring
复制标题
DOI：
10.1088/1367-2630/14/2/023061
复制
发表时间：
2012-02
影响因子：
3.3
通讯作者：
E. Träbert;M. Grieser;R. von Hahn;C. Krantz;R. Repnow;A. Wolf
中科院分区：
文献类型：
--
作者：
E. Träbert;M. Grieser;R. von Hahn;C. Krantz;R. Repnow;A. Wolf
许多离子种类的基态构型内的电偶极子禁戒跃迁在陆地和天体物理等离子体的诊断中发挥着重要作用，了解它们的速率对于碰撞辐射模型和光谱模拟至关重要。在等电子序列的前几个离子内，类 C 离子的接地构型中 2s22p2 1S0 能级的主要衰变通道从电四极变为磁偶极。在 TSR 重离子存储环上使用电子回旋共振离子源，我们实现了对磁偶极子衰变通道占主导地位的 Ne4+ 系统的寿命测量。这些数据补充了我们早期对 N+、O2+ 和 F3+ 的存储环寿命测量，我们将这些数据与目前的新结果和等电子背景下的可用理论计算一起讨论。
Electric-dipole forbidden transitions within the ground configuration of many ion species play an important role in the diagnostics of terrestrial and astrophysical plasmas, and knowing their rates is essential for collisional-radiative models and spectral simulation. The dominant decay channel of the 2s22p2 1S0 level in the ground configuration of C-like ions changes from electric quadrupole to magnetic dipole within the first few ions of the isoelectronic sequence. Using an electron cyclotron resonance ion source at the TSR heavy-ion storage ring, we realize a lifetime measurement on the system Ne4+ where the magnetic dipole decay channel becomes dominant. These data complement our earlier storage ring lifetime measurements on N+, O2+ and F3+, which we discuss together with the present new result and the available theoretical calculations in their isoelectronic context.