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An experimental setup for studying the core-excited atoms and molecules by electron impact using energy analysed electron–ion coincidence technique

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Abstract

Operation and performance of an apparatus for studying the decay dynamics relevant to core–hole decay processes in atoms and molecules excited by energetic electrons using an energy analysed electron–ion coincidence technique are described in some detail. The setup consists of a time- and position sensitive double-field linear TOF mass spectrometer coupled with a dual MCP detector and a single-pass CMA to select the energy of detected electrons. Details of different components involved in the setup are presented and discussed. To demonstrate the performance and capability of the apparatus, we present some typical results extracted from the TOF argon ion-mass spectra observed in coincidence with 18-energy selected electrons emitted from interaction of a continuous beam of 3.5 keV electrons with a dilute gaseous target of argon atoms. Specifically, the variation of relative correlation probability for the final ion-charge states Ar1+ to Ar4+ produced in the considered collision reactions as a function of energy of emitted electrons is determined and discussed.

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Acknowledgements

The authors would like to express their gratitude to the Department of Science and Technology (DST), New Delhi, Government of India for partial support through Grant No. SR/S2/LOP-033/2012 to carry out the experiments presented here. A significant part of the development of the experimental set up has been executed under support from the board of research in fusion science and technology (BRFST), Institute for plasma research (IPR), Ahmedabad, through the Grant No. NFP-DIAG-F10-01/2010, Department of Atomic Energy (DAE), Government of India. We are thankful to Pragya Bhatt, Raj Singh and Namita Yadav who have rendered their continuous support and help in the initial phase of development of the employed experimental setup.

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Authors and Affiliations

  1. Atomic Physics Laboratory, Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, 221005, India

    S. Kumar, S. Prajapati, B. Singh, B. K. Singh & R. Shanker

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  1. S. Kumar
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  2. S. Prajapati
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  3. B. Singh
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  4. B. K. Singh
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  5. R. Shanker
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Correspondence to R. Shanker.

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Kumar, S., Prajapati, S., Singh, B. et al. An experimental setup for studying the core-excited atoms and molecules by electron impact using energy analysed electron–ion coincidence technique. Indian J Phys 91, 721–729 (2017). https://doi.org/10.1007/s12648-017-0973-7

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  • DOI: https://doi.org/10.1007/s12648-017-0973-7

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