FIZIKA A 4 (1995) 2, 113-124

OPTICAL SIMULATION OF EFFUSION MOLECULAR BEAMS

BOGDAN ADAMCZYK and LESZEK MICHALAK
Institute of Physics, Maria Curie-Sklodowska University, 20-031 Lublin, Poland

Received 7 April 1995

The authors elaborate an analogy between a molecular beam and light beam. In the case of optical modelling of an effusion molecular beam, the light from a source is introduced into a simulation system, the "effusion'' channel, via a ground glass plate. The inside of the channel is lined with a corrugated aluminium foil with a high reflection coefficient and the light is reflected from the wall in chaotic directions, just like molecules from the wall of an actual channel. The intensity distribution of the light beam is measured with a photodetector. In this way we obtain information on high vacuum processes by performing measurements under the normal pressure. Application of infrared radiation gives better information on molecular beams. Using the optical modelling, the authors have performed several simulation investigations for mass spectrometry and molecular beam epitaxy. Optical simulation results have been verified with real molecular beams.

UDC 539.1.07
PACS 35.80.+s

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