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 Contact:
   Project Coordinator
   Prof. Theo Zouros
   Atomic & Molecular Physics
   Dept. of Physics
   Univ. of Crete, PO Box 2208,
  . GR-71003 Heraklion
   Tel:+30-2810394117
   Fax:+30-2810394301
   e-mail: tzouros@physics.uoc.gr

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Home > Work Packages > WP9 - Electron spectrometers - preparation, setup and operation
Work Packages

Work Packages: WP1  WP2  WP3  WP4  WP5  WP6  WP7  WP8  WP9  WP10  WP11  WP12 Timetable

Work Package 9: Analysis and presentation of new results

Figure 1: One of the first measurements using 12 MeV C4+ + Ne(20mTorr) taken in July 28, 2014 with the new data acquisition system. W=1525 eV F=4. The big spot on the PSD is the 1s2s2p 4P line of C3+ while the next two lines the 1s2s2p 2P- and 1s2s2p 2P+. Slight misalignment of peaks along the x-direction caused by insufficient mu-metal shielding between gas cell and spectrometer. The individual projections along the x-direction (energy dispersion axis) and the y-direction (focusing axis) are seen on the right together with the signal from the sum of all 4 signals.

Figure 2: Same as for Fig. 1, but with additional mu-metal shielding installed between gas cell and collision chamber. All peaks are now seen to be aligned.

Figure 3: (a) Measured zero-degree Auger emission spectra for 12 MeV C4+ mixed beam (1s2+, 1s2s 3S) state in collisions with Ne, He, H2 and Ar. The resulting Auger lines have been identified as belonging to the three-electron electron states 1s2l2l΄ 2,4L indicated. The spectra have been transformed to the rest frame of the projectile and the electron yield has been normalized to the incident beam current and gas pressure. (b): As in (α) but for 18 MeV C4+ beam in collisions with Ne and Ar gas targets. (c): Experimentally determined ratios (left scale) for R = 4P / (2P+ +2P_) and (right scale in red) for R΄ = 2P+/2P- of the production cross sections of (a) and (b). Also shown for comparison are the results of the previously published experimental data from WMU [16]. Corrections for both the 1s2s2p 4P life time effects and TE have also been included.Results presented at CDAMOP 2015 meeting in New Delhi and will appear as a proceedings publication .

Description of work package

Work Package

9

Start:

Month 19

Finish:

Month 48

Cost:

Title:

WP9: Analysis and presentation of new results

Description:

Research Teams:

RT1, RT2, RT3, RT4

9.1 Homebuilt Software for data analysis: Typical data analysis has to do with fitting Auger lines (with specialized peak fitting software) and extracting the absolute single and double differential cross sections as a function of collision energy. The technique of 00Auger projectile spectroscopy is well known for its ability to obtain such results for each state, as long as the observed states are well resolved in the spectra. This allows for very stringent tests of theory

9.2 Analysis of all data: Total production cross sections will also be determined using theoretical structure information (usually Hartree-Fock codes like Cowan’s etc. [Zou08a]) for the Auger yield and the angular distribution probability.

9.3 Presentation of new results within research groups: From the determined cross sections for the 4P and the 2P lines we shall eventually extract a value for the ratio R as a function of collision energy. Cascade contributions will be computed using various codes already developed by Zouros and Sulik [Zou08a].

9.4 Discussions of new results - reevaluation of what to measure: We also have extensive contact with theorists who will be interested to compare their calculations to our new data.

Deliverables:

1 Report and part of BS, MS or PhD thesis, software data analysis programs

WP9: Table of Activities in progress

CompletedActivityTarget Date
1rst beam time - 2 MeV p - search for Ne KLL Auger - general tests
Apr 2014
2nd beam time - 2 MeV p - seach for Ne KLL Auger - more tests
May 2014
3rd beam time - 12 MeV C4+ - tests with projectile Auger
Jul 2014

4rth beam time:

- 3 MeV p - search for Ne KLL target - Auger energy calibration

- 12 MeV C4+ - more tests with projectile Auger

Sep 2014

Analysis of results of beam time Sep 9-12/2014

Oct 2014

Accelerator down time for maintenance, trouble shooting and testing terminal gas stripper

Oct 2014

5th beam time:

5-7/11: 3 MeV p - search for Ne KLL target - Auger energy calibration

Nov 2014

6th beam time:

17-19/12: 3 MeV p - determination of Ne KLL target Auger energy calibration - found absolute efficiency of MCP around 35%

Dec 2014

7th beam time:

12-17/1: 12 MeV C4+ - more tests with projectile Auger (participation of Prof. Omer Sise)

Jan 2015

8th beam time:

31/1-4/2: 12 MeV C4+ - more tests with projectile Auger, 4P and biased gas cell

5/2: 18 MeV C4+ - more tests with projectile Auger, 4P and biased gas cell

Feb 2015

9th beam time:

4-10/11: 9, 12, 18 MeV C4+ - first use of post strippers, tests of strippers and metastable fraction produced, biased gas cell results and identification of metastable 1s2p2 4Pe

Nov 2015

Analysis of results of 9th beam time

Nov 2015
Final Report on electron measurements at the TANDEM ready - work package completed
Dec 2015

WP9: Deliverables

WP9: People involved

  • Prof. Theo Zouros - MRG RT1 (UoC)
  • Giannis Madesis (PhD student) - GEC RT1 (UoC)
  • Dr. Tasos Dimitriou (postdoc) - GEC RT1 (UoC)
  • Prof. Manolis Benis - MRG RT3 (UoI)
  • Dr. Bela Sulik - MRG RT1 (invited scientist - ATOMKI, Debrecen Hungary)
  • Aggelos Laoutaris (MS student) - GEC RT1 (UoC)
  • Prof. Omer Sise, Dept. of Science Education, Faculty of Education, Suleyman Demirel University, 32260 Isparta, Turkey - GEC RT1 (UoC)

WP9: Absolute Calibration Standards

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig. 1. Ne KLL Auger diagram lines and proton cross sections [Woods, et al Fig. 3, Phys. ReV. A 13 (1976) 1358. ]

 

Ne KLL Diagram line Energies and Relative intensities [from electron beam measurements - Table2, Albiez, ZPD16 (1990) 97]

Fig. 2. 4.2 MeV p + Ne KLL Lines [Stolterfoht PL45A (1973) 351]

Fig. 3. 4 MeV p+Ne, F=4 Ne KLL spectrum taken with the HDA (Benis PhD - KSU) Resolution = 1.84/804.30 = 0.229%

Fig. 4. 3 MeV p+Ne, W=805eV, F=6 Kan Ne KLL spectrum taken with the HDA (APAPES Dec 19, 2014) Resolution = 1.362/804.30 = 0.169%

WP9: Technical Notes

WP9: Suggested Reading

Last Update: 10/10/17 17:11:22

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