Micrometer-sized nozzles and skimmers for the production of supersonic He atom beams
作者:
J. Braun,
P. K. Day,
J. P. Toennies,
G. Witte,
E. Neher,
期刊:
Review of Scientific Instruments
(AIP Available online 1997)
卷期:
Volume 68,
issue 8
页码: 3001-3009
ISSN:0034-6748
年代: 1997
DOI:10.1063/1.1148233
出版商: AIP
数据来源: AIP
摘要:
Micrometer-sized nozzles and skimmers made from drawn glass tubes are described and tested for the production of highly monoenergetic He atom beams. Glass nozzles with diameters between 1&mgr;m and 4&mgr;m when operated at He source stagnation pressures of up to 1000 atm provide intense beams with measured speed ratios ofS=50–100,in good agreement with the predicted behavior scaled from nozzles with larger openings. Miniature glass skimmers with diameters as small as 3&mgr;m were also successfully tested with conventional 10&mgr;m diameter nozzles. These miniature nozzle-beam sources can be used to greatly reduce the size of present-day He-atom surface-scattering time-of-flight spectrometers and to reduce the number of vacuum stages and the size of vacuum pumps. They also open up new experimental possibilities as illustrated by measurements of the spatial profiles of seeded nozzle beams. ©1997 American Institute of Physics.
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