BORIS Theses

BORIS Theses
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A new Time-Of-Flight Mass Spectrometer (TOF-MS) for noble gas analysis

Ramisetty, Ramakrishna (2015). A new Time-Of-Flight Mass Spectrometer (TOF-MS) for noble gas analysis. (Thesis). Universität Bern, Bern

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Noble gas analysis in early solar system materials, which can provide valuable information about early solar system processes and timescales, are very challenging because of extremely low noble gas concentrations (ppt). We therefore developed a new compact sized (33 cm length, 7.2cm diameter, 1.3 L internal volume) Time-of-Flight (TOF) noble gas mass spectrometer for high sensitivity. We call it as Edel Gas Time-of-flight (EGT) mass spectrometer. The instrument uses electron impact ionization coupled to an ion trap, which allows us to ionize and measure all noble gas isotopes. Using a reflectron set-up improves the mass resolution. In addition, the reflectron set-up also enables some extra focusing. The detection is via MCPs and the signals are processed either via ADC or TDC systems. The objective of this work is to understand the newly developed Time-Of-Flight (TOF) mass spectrometer for noble gas analysis in presolar grains of the meteorites. Chapter 1 briefly introduces the basic idea and importance of the instrument. The physics relevant to time-of-flight mass spectrometry technique is discussed in the Chapter 2 and Chapter 3 will present the oxidation technique of nanodiamonds of the presolar grains by using copper oxide. Chapter 4 will present the details about EGT data analysis software. Chapter 5 and Chapter 6 will explain the details about EGT design and operation. Finally, the performance results will be presented and discussed in the Chapter 7, and whole work is summarized in Chapter 8 and also outlook of the future work is given.

Item Type: Thesis
Dissertation Type: Single
Date of Defense: 2015
Additional Information: e-Dissertation (edbe)
Subjects: 500 Science > 530 Physics
Institute / Center: 08 Faculty of Science > Physics Institute
Depositing User: Admin importFromBoris
Date Deposited: 25 Jan 2019 12:59
Last Modified: 25 Jan 2019 12:59

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