Rudi's major achievements
Neutron physics
Radiation and metrology
Mass-spectrometric gas analysis
Vacuum and surface technology
Vacuum and surface technology
Cryosorption pumps
Novel cryosorption pumps for evacuation from atmosphere down to 10-7 mbar with low LN2-consumption. Design and construction of two models, exhibiting high-vacuum pumping speeds of
50 l/s and 150 l/s: R. Dobrozemsky and G. Moraw, Japan. J. Appl. Physics Suppl. 2 (1974) 97.
Vacuum tweezers
Invention of a tweezers manipulator (termed "vacuum chopsticks" by Japanese visitors) for the handling of sensible specimens in uhv:
A. Breth and R. Dobrozemsky, Proc. 8th Internat. Vac. Congr. (Cannes 1980), p. 90.
Outgassing rates
First proof of low outgassing rates of aluminium, and of the usefulness of "low" bakeout temperatures between 100°C and 150°C:
G. Moraw and R. Dobrozemsky, Japan J. Appl. Physics Suppl. 2 (1974) 261.
Water adsorption in atmosphere and vacuum
Direct measurement of sojourn times of water molecules on technical surfaces in atmosphere and vacuum by means of HTO (tritiated water) and liquid scintillation counting technique: e.g., R. Dobrozemsky, Vacuum 46 (1995) 789.
Labelling of diffusion-pump oil with tritium
Study of oil migration phenomena in vacuum by means of the radioactive tracer technique. For that purpose, a 500 ml DC 704 silicone oil sample with 68 mCi/ml
(2,5 GBq/ml) specific T-activity has been produced by exposure of the vaporized oil to 100 Ci T-gas at 300°C,
resulting in a 34% exchange yield (i.e., a record-yield for a Wilzbach-type reaction!). Results of oil-migration measurements in baffles and other
parts of vacuum systems can be found, e.g., in: R. Dobrozemsky, W.K. Huber, and F.P. Viehboeck, Z. Naturforschg. 22a (1967) 549. Detection limits
between 10-2 and 10-3 "monolayers" have been achieved for oil coverages on technical surfaces.
Production of metal-tritides and study of T2- and 3He-release
Ta- and Ti-samples have been loaded with T, and the release of T2 and 3
He has been studied over a period of 3 years by means of the mass-spectrometric method. Due to a tricky gas-accumulation procedure,
a sensitivity limit of about 10-16 mbar.l/s for the T2- and 3He-release
could be obtained (R. Dobrozemsky and G.W. Schwarzinger, report in preparation).
Magnetic water treatment
Study of effects of magnetic fields on scale and stain in house-water systems (industrial contract, unpublished).
cont':
Neutron physics
Radiation and metrology
Mass-spectrometric gas analysis
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