Method for determining the lifetimes of the long-lived 1s2s2p 4PJ state J-levels

A method is proposed for measuring the J-level lifetimes of the long-lived 1s2s2p PJ state for low Z Li-like ions. This necessity stems from the fact that in Auger electron spectroscopy it is necessary to accurately determine the effective detection solid angle that straightforwardly depends on the lifetimes of the long-lived states. The proposed method is applied to the geometry of the zero-degree projectile electron spectroscopy (ZAPS) setup, located at the NCSR ”Demokritos” Tandem accelerator laboratory, utilizing Monte Carlo type simulations within the SIMION ion optics package. It is found that the proposed method can be safely applied to elements having 5 ≤ Z ≤ 9.

[1]  E. Benis,et al.  Experimental determination of the effective solid angle of long-lived projectile states in zero-degree Auger projectile spectroscopy , 2018 .

[2]  T. Zouros,et al.  Determination of the state production ratios , and from fast () mixed-state He-like ion beams in collisions with H2 targets , 2016 .

[3]  T. Zouros,et al.  Evidence for the non-statistical population of the 1s2s2p 4P metastable state by electron capture in 4 MeV collisions of B3+(1s2s 3S) with H2 targets , 2016 .

[4]  J. Santos,et al.  Evaluation of the effective solid angle of a hemispherical deflector analyser with injection lens for metastable Auger projectile states , 2015 .

[5]  T. Zouros,et al.  Determination of the solid angle and response function of a hemispherical spectrograph with injection lens for Auger electrons emitted from long lived projectile states. , 2015, The Review of scientific instruments.

[6]  A. Lagoyannis,et al.  Atomic Physics with Accelerators: Projectile Electron Spectroscopy (APAPES) , 2015 .

[7]  B. Sulik,et al.  Selective enhancement of 1s2s2p PJ4 metastable states populated by cascades in single-electron transfer collisions of F7+ (1 s2 1s2s S3) ions with He and H2 targets , 2008 .

[8]  Tom Kirchner,et al.  Nonstatistical enhancement of the 1s2s2p 4P state in electron transfer in 0.5-1.0-MeV/u C4,5 +He and Ne collisions , 2008 .

[9]  M. Zamkov,et al.  Fraction of metastable 1s2s 3 S ions in fast He-like beams (Z=5-9) produced in collisions with carbon foils , 2002 .

[10]  M. Zamkov,et al.  Technique for the determination of the 1 s 2 s 3 S metastable fraction in two-electron ion beams , 2002 .

[11]  H. Tawara,et al.  Energy dependence of the metastable fraction in B 3+ (1s 2 1 S,1s2s 3 S) beams produced in collisions with thin-foil and gas targets , 2001 .

[12]  Stephen M. Shafroth,et al.  Accelerator-based atomic physics : techniques and applications , 1997 .

[13]  D. Lee,et al.  Electron capture and excitation studied by state-resolved KLL Auger measurement in 0.25−2 MeV/u F7+(1s21S, 1s2s3S) + H2/He collisions , 1991 .

[14]  Chung,et al.  Spin-induced autoionization and radiative transition rates for the (1s2p2p)4PJ states in lithiumlike ions. , 1988, Physical review. A, General physics.

[15]  Chung,et al.  Complex-rotation method for spin-induced autoionization. , 1987, Physical review. A, General physics.

[16]  Mau H. Chen,et al.  Deexcitation of light Li-like ions in the1s2s2pstate , 1983 .