Sommario
Si descrive un apparecchio per la produzione di fasci molecolari supersonici nel quale, facendo uso di stazioni di pompaggio, a diffusione e criogenico, relativamente modeste, si può produrre un flusso continuo di molecole di Argon di4 · 10 18 molecole sterad−1 sec−1 in un ambiente in cui la pressione di fondo è mantenuta inferiore a10 −6 mmHg. Vengono riportate misure di intensità del fascio, a diversi valori della pressione nell'ugello, in funzione della distanza ugello-primo collimatore e del diametro del primo collimatore. I risultati vengono confrontati con le teorie esistenti e dal confronto si ottiene informazioni sulla distribuzione della temperatura radiale nei getti in espansione libera.
Summary
A supersonic molecular beam production system is described in which a continuous flux of Argon molecules can be produced as high as4 · 10 18 molecules sterad−1 sec−1 in a vessel where the background pressure can be kept below10 −6 mmHg using relatively little cryo and diffusion pumping facilities. The beam intensity is measured at different stagnation pressures as a function of nozzle-skimmer separation and skimmer diameter. The results are compared with the existing theories, and information is obtained on the radial temperature distribution in the free expanding jet.
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Scoles, G., Torello, F. Supersonic molecular beams production and temperature distribution in free expanding jets. Meccanica 3, 20–27 (1968). https://doi.org/10.1007/BF02173989
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DOI: https://doi.org/10.1007/BF02173989