Balmer- and L-shell series of highly charged uranium in the experimental storage ring

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1 Balmer- and L-shell series of highly charged uranium in the experimental storage ring Summer student GSI Thomas Burschil Johann Wolfgang von Goethe-University, Frankfurt/Main 09/24/2007

2 Overview Physical basics Radiative emission Experiment Research at the ESR series Balmer series in hydrogen-like uranium L-shell series in helium- and lithium-like uranium

3 Overview Physical basics Radiative emission Experiment Research at the ESR series Balmer series in hydrogen-like uranium L-shell series in helium- and lithium-like uranium

4 Overview Physical basics Radiative emission Experiment Research at the ESR series Balmer series in hydrogen-like uranium L-shell series in helium- and lithium-like uranium

5 Radiative processes transition recombination electron capture radiative (REC) time reverse photo ionization non-radiative (NRC) three body interaction where momentum and energy is shared between the collision partner bremsstrahlung, etc.

6 Radiative processes transition recombination electron capture radiative (REC) time reverse photo ionization non-radiative (NRC) three body interaction where momentum and energy is shared between the collision partner bremsstrahlung, etc.

7 Radiative processes transition recombination electron capture radiative (REC) time reverse photo ionization non-radiative (NRC) three body interaction where momentum and energy is shared between the collision partner bremsstrahlung, etc.

8 Radiative processes transition recombination electron capture radiative (REC) time reverse photo ionization non-radiative (NRC) three body interaction where momentum and energy is shared between the collision partner bremsstrahlung, etc.

9 Radiative processes transition recombination electron capture radiative (REC) time reverse photo ionization non-radiative (NRC) three body interaction where momentum and energy is shared between the collision partner bremsstrahlung, etc.

10 Transition from energy level to energy level energy splitting so-called series finite state has the same main quantum number Lyman, Balmer, Paschen,... in hydrogen-like ions K-shell, L-shell, M-shell,... in other ions For example: ω = E f E i

11 Transition from energy level to energy level energy splitting so-called series finite state has the same main quantum number Lyman, Balmer, Paschen,... in hydrogen-like ions K-shell, L-shell, M-shell,... in other ions For example: ω = E f E i

12 Transition from energy level to energy level energy splitting so-called series finite state has the same main quantum number Lyman, Balmer, Paschen,... in hydrogen-like ions K-shell, L-shell, M-shell,... in other ions For example: ω = E f E i

13 Transition from energy level to energy level energy splitting so-called series finite state has the same main quantum number Lyman, Balmer, Paschen,... in hydrogen-like ions K-shell, L-shell, M-shell,... in other ions For example: ω = E f E i

14 Transition from energy level to energy level energy splitting so-called series finite state has the same main quantum number Lyman, Balmer, Paschen,... in hydrogen-like ions K-shell, L-shell, M-shell,... in other ions For example: ω = E f E i

15 REC and NRC ion captures electron from a target atom two possibilities: 1. non-radiative electron capture

16 REC and NRC ion captures electron from a target atom two possibilities: 1. non-radiative electron capture

17 REC and NRC ion captures electron from a target atom two possibilities: 1. radiative electron capture 2. non-radiative electron capture

18 REC and NRC ion captures electron from a target atom two possibilities: 1. radiative electron capture 2. non-radiative electron capture

19 REC and NRC cross section: σ REC Z T Z 5 P σ NRC Z 5 T Z 5 P

20 REC and NRC ion captures electron from a target atom two possibilities: 1. radiative electron capture 2. non-radiative electron capture

21 REC and NRC cross section: σ REC Z T Z 5 P v 5/2 σ NRC Z 5 T Z 5 P v 11

22 REC and NRC cross section: σ REC Z T Z 5 P v 5/2 σ NRC Z 5 T Z 5 P v 11

23 Research facility UNILAC SIS ESR electron cooler radiative recombination experiments gas-jet target electron capture experiments

24 Research facility UNILAC SIS ESR electron cooler radiative recombination experiments gas-jet target electron capture experiments

25 Research facility UNILAC SIS ESR electron cooler radiative recombination experiments gas-jet target electron capture experiments

26 Research facility UNILAC SIS ESR electron cooler radiative recombination experiments gas-jet target electron capture experiments

27 Observation places at the gas-jet target

28 Observation places at the gas-jet target

29 Recorded spectra

30 Recorded spectra

31 Recorded spectra

32 Recorded spectra

33 Calibration

34 Calibration system parameters U 92+ Ar observation angle: 35 beam energy: 88 MeV /u β = , γ = transfer factor between the laboratory and the emitter system: Doppler Shift = E labor sys = E emitter sys γ (1 β cos ϑ)

35 Calibration system parameters U 92+ Ar observation angle: 35 beam energy: 88 MeV /u β = , γ = transfer factor between the laboratory and the emitter system: Doppler Shift = Calibration E labor sys = E emitter sys γ (1 β cos ϑ) E emitter system E labor system channel 34.2 kev 46.9 kev 1784 ± kev 20.4 kev 733 ± 10

36 Calibration

37 Comparison Binding energies associated with transitions in a Balmer series peak E labor system E emitter system kev ± 0.44 kev kev ± 0.32 kev kev ± 0.43 kev kev ± 0.32 kev kev ± 0.60 kev kev ± 0.44 kev kev ± 0.43 kev kev ± 0.31 kev kev ± 0.49 kev kev ± 0.36 kev kev ± 0.43 kev kev ± 0.32 kev kev ± 0.62 kev kev ± 0.45 kev kev ± 0.60 kev kev ± 0.44 kev kev ± 0.47 kev kev ± 0.34 kev end kev ± 0.50 kev kev ± 0.36 kev

38 Comparison Binding energies associated with transitions in a Balmer series Example for transition energies

39 Comparison Binding energies associated with transitions in a Balmer series Example for transition energies

40 Comparison Binding energies associated with transitions in a Balmer series Example for transition energies

41 Comparison Binding energies associated with transitions in a Balmer series Example for transition energies

42 Comparison Binding energies associated with transitions in a Balmer series peak E emitter system E transition transition kev ± 0.32 kev kev 3s 1/2 2p 3/ kev ± 0.32 kev kev 3d 5/2 2p 3/ kev ± 0.44 kev kev 3s 1/2 2s 1/ kev ± 0.31 kev kev 3p 3/2 2s 1/ kev ± 0.36 kev kev 4d 5/2 2p 3/ kev ± 0.32 kev kev 5s 1/2 2p 3/ kev ± 0.45 kev kev 4p 3/2 2s 1/ kev ± 0.44 kev kev 5p 3/2 2s 1/ kev ± 0.34 kev kev 6s 1/2 2s 1/2 end kev ± 0.36 kev kev continuum

43 Results and Conclusion Spectra with associated transitions to the L-shell

44 Results and Conclusion Cascade

45 L-shell series in helium- and lithium-like uranium experiment in August 2007 spectra with the first 4 L-shell lines data do not fit with the theoretical values more corrections: shielding correction every electron in the ion shields one proton

46 L-shell series in helium- and lithium-like uranium experiment in August 2007 spectra with the first 4 L-shell lines data do not fit with the theoretical values more corrections: shielding correction every electron in the ion shields one proton

47 L-shell series in helium- and lithium-like uranium experiment in August 2007 spectra with the first 4 L-shell lines data do not fit with the theoretical values more corrections: shielding correction every electron in the ion shields one proton

48 L-shell series in helium- and lithium-like uranium experiment in August 2007 spectra with the first 4 L-shell lines data do not fit with the theoretical values more corrections: shielding correction every electron in the ion shields one proton

49 L-shell series in helium- and lithium-like uranium experiment in August 2007 spectra with the first 4 L-shell lines data do not fit with the theoretical values more corrections: shielding correction every electron in the ion shields one proton

50 L-shell series in helium- and lithium-like uranium experiment in August 2007 spectra with the first 4 L-shell lines data do not fit with the theoretical values more corrections: shielding correction every electron in the ion shields one proton E corr ( )

51 Spectrum of lithium-like uranium M- and L-shell series

52 Comparison Shielding correction Helium-like uranium in [kev ] peak E labor sys E emitter sys E shield corr. E theor

53 Comparison Shielding correction Lithium-like uranium in [kev ] peak E labor sys E emitter sys E shield corr. E theor

54 Conclusions E ( ) shielding correction is very rough approximation a more precise theory is needed

55 Conclusions E ( ) shielding correction is very rough approximation a more precise theory is needed

56 The end

57 The end Questions?

free electron plus He-like ion

free electron plus He-like ion E e I p,n E 2 E 1 ΔE=E e +I p,n aber: ΔE=E 2 -E 1 n n n n n n=1 n=2 n=3 AAMOP 2011-2012 2011-11-16 1 dielectronic recombination E 2 E 1 n n n n n n=1 n=2 n=3 AAMOP 2011-2012