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Journal of Physics: Conference Series

Towards a measurement of the 2s2p 3P0 → 2s2 1S0 E1M1 two photon transition rate in Be-like xenon ions

D Bernhardt1, C Brandau1,2, C Kozhuharov2, A Müller1, S Schippers1, S Böhm1, F Bosch2, J Jacobi1, S Kieslich1, H Knopp1, P H Mokler1,3, F Nolden2, W Shi1, Z Stachura4, M Steck2 and T Stöhlker2,5

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Dielectronic recombination (DR) of Be-like 136Xe50+ was measured by employing the electron-ion merged-beam technique at the storage ring ESR of GSI in Darmstadt, Germany. We present results covering the center-of-mass energy range 0 − 4 eV. In addition to Rydberg series of resonances associated with ground-state intra L-shell excitations, resonances were found which are formed during DR of initially metastable 136Xe50+(2s2p 3P0) parent ions. This state is the first excited state and is long lived because the J=0 → J=0 transition and the absence of nuclear spin make the rare E1M1 two-photon transition the lowest-order decay channel. Future measurements which will monitor the strength of the resonances as function of storage time may be exploited for a measurement of the E1M1 two photon transition rate.


34.80.Lx Recombination, attachment, and positronium formation

32.10.Fn Fine and hyperfine structure

32.80.-t Photoionization and excitation

31.30.Gs Hyperfine interactions and isotope effects

32.70.Cs Oscillator strengths, lifetimes, transition moments


Atomic and molecular physics


Issue 1 (2012)


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