التفاصيل البيبلوغرافية
| العنوان: |
Researches on interactions of satellite-speed helium atoms with aluminum and quartz surfaces |
| المؤلفون: |
Liu, S. M, Knuth, E. L |
| بيانات النشر: |
United States: NASA Center for Aerospace Information (CASI), 1976. |
| سنة النشر: |
1976 |
| مصطلحات موضوعية: |
Atomic And Molecular Physics |
| الوصف: |
Three major areas were experimentally studied: (1) energy transfer in collisions of satellite-speed (700 m/sec) helium atoms with a cleaned satellite-type aluminum surface was investigated using the molecular-beam technique. Spatial and energy distributions of reflected helium atoms were measured and analyzed, (2) The gross accommodation coefficient for a satellite-speed (7000 m/sec) helium beam entering a 2-inch-diameter aluminum spherical cavity was determined by measuring the exit velocity distribution of the leaving helium atoms using a metastable time-of-flight method. Results indicate that the 7000-m/sec satellite-speed helium atoms entering the cavity gain full accommodation with the room-temperature inner surface of the sphere through a large number of collisions before leaving the spherical cavity; and (3) the feasibility of producing a satellite-speed atomic hydrogen beam by arc-heating, for use in studies of interactions of satellite-surfaces with hydrogen atoms under laboratory conditions, was investigated. It was found that a stable arc-heated molecular hydrogen beam can be obtained using the arc-heater, and that a partially dissociated hydrogen beam can be produced. Photographs of laboratory equipment are shown. |
| نوع الوثيقة: |
Report |
| اللغة: |
English |
| URL الوصول: |
https://ntrs.nasa.gov/citations/19760013859 |
| ملاحظات: |
NGR-05-007-416 |
| رقم الانضمام: |
edsnas.19760013859 |
| قاعدة البيانات: |
NASA Technical Reports |