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[SIGPLUS_EXCEPTION_SOURCE] Image source is expected to be a full URL or a path relative to the image base folder specified in the back-end but UV/Excimer/exirad172_diagram.png is neither a URL nor a relative path to an existing file or folder.

With Excirad 172 a completely new generation of VUV sources becomes available for surface curing and matting of UV-polymerizable materials.

 

 
 
Reine Stickstoffkühlung                                 Kombinierte Kühlung: Stickstoff / deionisiertes Wasser

Pure Nitrogen cooling                                              Combined cooling : Nitrogen / Deionized water

 

The top figure shows a cross-sectional view through an excimer lamp. A cylindrical, double-walled quartz tube is filled with around 600 hPa xenon.  Electrodes, which are situated on the inner and outer wall of the quartz tube are connected to a HF high voltage generator.  When the high-frequency high voltage is applied, micro-discharges develop in the gas to produce a 172 nm radiation.  Suppose the following mechanism: electrons, which are generated and accelerated during the micro-discharge, transfer their energy to Xenon atoms. There arise Xenon ions or excited states of Xenon:

e- + Xe → Xe*,Xe+.

{gallery width=400 alignment=right crop=0} UV/Excimer/exirad172_diagram.png{/gallery}

In a second step, a Molecule of excited Xenon Xe2* is formed in a reaction between two atoms of Xenon Xe in ground state and an excited Xenon atom Xe* :

Xe* + 2Xe → Xe2* + Xe.

The Xe * excimer produces a 172 nm photon. The resulting ground state is unstable and decays into two xenon atoms.

Xe2* → 2Xe + hν (172 nm).

 

Because the 172 nm Photons are strongly absorbed by Oxygen, it is necessary to do the irradiation of coatings under nitrogen.  In practice, we use a closed chamber with nitrogen supply.  IOT GmbH has in the last few years successfully implemented 172 nm Excimer lamps for physical matting to an industrial use.

 

Mit verschiedenen Gasfüllungen sind unterschiedliche Wellenlängen möglich, die sich in ihrer Eindringtiefe unterscheiden.

More informations:

 


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