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Projects / Programmes source: ARIS

Investigation of materials and processes in vacuum optoelectronics

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Research activity

Code Science Field Subfield
2.09.04  Engineering sciences and technologies  Electronic components and technologies  Optoelectronics 

Code Science Field
T210  Technological sciences  Mechanical engineering, hydraulics, vacuum technology, vibration and acoustic engineering 
T150  Technological sciences  Material technology 
Keywords
recombination rate coeficient of hydrogen on stainless steel, extremely high vacuum, stable insulation grade vacuum, sol-gel method for preparing of luminescent materials
Evaluation (rules)
source: COBISS
Evaluation of bibliographic research performance indicators according to ARIS methodology
Citations Citations for bibliographic records in COBIB.SI that are linked to records in citation databases
source: WoS source: Scopus source: COBISS
Researchers (4)
no. Code Name and surname Research area Role Period No. of publications
1.  03066  PhD Vincenc Nemanič  Electronic components and technologies  Head  1997 - 1999  245 
2.  09105  Borut Praček  Electronic components and technologies  Researcher  1998 - 1999  113 
3.  10497  MSc Sonja Spruk  Electronic components and technologies  Researcher  1998 - 1999  29 
4.  03366  Marko Žumer  Electronic components and technologies  Researcher  1998 - 1999  110 
Abstract
Long term stable low pressure within small enclosures is mainly determined by: tightness, condition (state) of surfaces and degree of outgassing of material. Leak rates, determined by helium leak detectors, are a good measure whether the envelopes are tight or not. Leaks below that level are difficult to distinguish from other sources of the gas, for example permeation. After seal off, stable equilibrium pressure can be reached after very long period (several years) and it’s value can be rather high. Gases, dissolved in the wall (mainly hydrogen), are released in vacuum by diffusion. Adsorbed gases with high binding energy are also released slowly; their equilibrium pressure is described by suitable isotherm. In the literature, time dependence of those contributions is mathematically modeled more or less successfully. Most of the published data is related to the pump down time, while much less data is available about long term pressure after seal off. Theoretically, vacuum vessel with thin metal walls should outgass less than similar thick wall vessel. This means, that vacuum treatment for high vacuum and UHV chambers could be proceeded in shorter time, while the pressure could be more stable. There is no confirmation of above hypothesis measured on any type of vessel with such a thin wall metal envelope in the literature. The application can be realized in several scientific instruments as well as in efficient thermal insulation vessels and other structures containing cooled sensors, detectors, etc.
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