Sökning: "time of flight spectrometer"

Visar resultat 6 - 10 av 43 avhandlingar innehållade orden time of flight spectrometer.

1. 6. Development and Construction of a 2.5-MeV Neutron Time-of-Flight Spectrometer Optimized for Rate (TOFOR)

   Författare :Anders Hjalmarsson; Jan Källne; James Drake; Uppsala universitet; []
   Nyckelord :Nuclear physics; Kärnfysik;

   Sammanfattning : A new neutron time-of-flight spectrometer optimized for high count rate (TOFOR) has been developed for the JET research tokamak. TOFOR will measure the energy distribution of neutrons emitted from the d+d → 3He+n fusion reactions in deuterium plasma. LÄS MER

3. 7. Quantitative Bioanalysis : Liquid separations coupled to targeted mass spectrometric measurements of bioactive compounds

   Författare :Björn Arvidsson; Jonas Bergquist; Magnus Wetterhall; Gérard Hopfgartner; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Analytical chemistry; Method development; Enhanced microdialysis; Column switching; Liquid chromatography; Capillary electrophoresis; Electrospray ionization; Mass spectrometry; Triple quadrupole; Time-of-flight; Quantitation; Validation; Analytisk kemi;

   Sammanfattning : Performing quantitative analysis of targeted bioactive compounds in biological samples, such as blood plasma, cerebrospinal fluid or extracts from pig liver, put high demands on the ruggedness of the method acquiring the results. In addition to the complexity of the sample matrix, the bioactive compounds targeted for analysis usually have low levels of natural abundance, further increasing the demand on the analytical method sensitivity. LÄS MER

4. 8. Multi-Electron Coincidence Studies of Atoms and Molecules

   Författare :Egil Andersson; Raimund Feifel; Jan-Erik Rubensson; Kiyoshi Ueda; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; multi-ionization; electron emission; time-of-flight spectroscopy; coincidence spectroscopy; core-valence ionization; synchrotron radiation; electron correlation; Atomic and molecular physics; Atom- och molekylfysik; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

   Sammanfattning : This thesis concerns multi-ionization coincidence measurements of atoms and small molecules using a magnetic bottle time-of-flight (TOF) spectrometer designed for multi-electron coincidence studies. Also, a time-of-flight mass spectrometer has been used together with the TOF electron  spectrometer for electron-ion coincidence measurements. LÄS MER

5. 9. Reactivity of Metal Clusters with Diatomic Molecules

   Författare :Lotta Holmgren; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nbn; cluster; reactivity; Rhn; NO; D2; CO; N2; laser vaporization; Wn; Nin; photoionization; time-of-flight mass spectrometer; ionization potential; Cun; O2; Vn;

   Sammanfattning : The reactivity of transition-metal clusters, in the approximate size range 10-60 atoms, with diatomic molecules has been investigated. A pulsed beam of neutral clusters is produced by a laser-vaporization source and passed through a low-pressure reaction cell containing the reactive gas. LÄS MER

7. 10. Advanced Plasma Analyzer for Measurements in the Magnetosphere of Jupiter

   Författare :Joan Stude; Stas Barabash; Martin Wieser; Joseph H. Westlake; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; plasma instrumentation; time-of-flight; space; Jupiter; JUICE; PEP; JDC; start surface; charge fraction; the final frontier; accidental counts; chance counts; micro pore optics; spherical-wedge electrostatic analyzer; rymd- och plasmafysik; Space and Plasma Physics; fysik; Physics;

   Sammanfattning : The Jupiter Icy Moons Explorer is a planetary exploration mission that aims to study the moons of Jupiter in the planet’s vast magnetosphere. Among the various instruments on board is the Particle Environment Package (PEP), that is led by the Swedish Institute of Space Physics (IRF) in Kiruna. LÄS MER