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High dissociation efficiency Ultra-clean Low power Low Maintenance Back-up filament	Thermal Gas Crackers The TC series of thermal gas crackers rely on our successful electron beam heating technology. These instruments allow a very high dissociation efficiency of the molecular gas at low power. Furthermore, direct water cooling ensures that only the filament and the cracking tube are ever above 30oC, thus allowing extremely clean operation and no contamination. Competitors thermal crackers employ a very hot (~2500oC) tungsten filament at high power (~400W), thus imposing an undesirable heat load on UHV systems. Also, this type of cracker are not very gas-efficient and of limited application (principally for H2) since tungsten is attacked by some gases, such as oxygen. The Oxford Applied Research thermal gas crackers, models TC50 and TC4x50, exploit our established reactive gas-resistant e-beam heating technology. They incorporate fine bore inert cracker tubes which are connected directly to the gas lines, thus confining and minimising gas load, whilst providing a large surface area and long path length for high efficiency cracking at very low flow rates. The catalytic nature of the cracker tube lowers the otherwise high temperature and power necessary to achieve substantial dissociation (>70%) at 60W. Also in contrast to tungsten filament crackers, they can be used to dissociate O2, Cl2 and other reactive gases. The graph above shows the dissociation of O2, resulting in a decrease in the partial pressure of O2 when the power to the cracker tube is applied at 10s The crackers are directly water cooled, which minimises outgassing, and are fitted with  a back-up electron emitter for prolonged operations. The TC50 contains a single cracker tube. The TC4x50 contains four cracker tubes with separate gas inlets thus allowing simultaneous dissociation of up to four gases. Specifications Model TC50 TC4X50 In-vacuum diameter 34mm 57mm In-vacuum length 200mm(Standard) 200mm(Standard) Mounting flange NW35CF NW63CF Cracker temperature <1000oC <1000oC Max. power 60W 4X60W Operating gas flow 0-0sccm 0-0sccm Services 0.5l/min water cooling 0.5l/min water cooling Thermal Cracker Application Note Radical Reactions with Organic Thin Films: Chemical Interaction of Atomic Oxygen with an X-ray Modified Self-Assembled Monolayer Download the brochure in PDF format: TC Series
Last updated: 23rd July 2010 Copyright 2008 The Vacutec Group Home About Us News Conferences Contact Technical Support