Halwidl D. Development of an Effusive Molecular Beam Apparatus

Springer Fachmedien, Wiesbaden, 2016. – 118 p. – ISBN10: 3658135352Publication in the field of natural sciences
Daniel Halwidl presents the development of an effusive molecular beam apparatus, which allows the dosing of gases, liquids, and solids in ultra-high vacuum. The apparatus is designed to adsorb precise and reproducible doses to a defined area on metal oxide samples, which is required in Temperature Programmed Desorption and other surface chemistry experiments. The design and the construction of the apparatus is described. The properties of the molecular beam are experimentally confirmed. The beam profile has a core diameter of 3.5 mm and a standard core pressure of 4 x 10-8 mbar, while the background pressure is 4 orders of magnitude lower.
Topics
Physical Chemistry
CatalysisMolecular Beams
Temperature Programmed Desorption
Flow of Gases
Flow Regimes
Conductance
Molecular flow
Continuum flow
Transition flow and conductance over the whole pressure range
Effusive Molecular Beam Sources
Thin-walled Orifice
Single Tube
Capillary Array
Molecular Beam
Requirements
Concept
Theory
Construction
Results
Test Setup
Molecular Beam Profile
Shutter
Summary and Outlook
Appendices
Gas Properties
Conductance
Pirani Gauge Argon Correction Factor