Cooling of a Gas of Atomic Hydrogen with Microwave Radiation
1987; Institute of Physics; Volume: 26; Issue: S3-1 Linguagem: Inglês
10.7567/jjaps.26s3.245
ISSN1347-4065
Autores Tópico(s)Advanced Thermodynamics and Statistical Mechanics
ResumoAn ideal method of obtaining Bose Einstein Condensation (BEC) of atomic hydrogen would be by laser cooling in a light trap so that physical walls of liquid helium where recombination takes place are removed from the system. Unfortunately, powerful lasers in the Lyman alpha region required for cooling by established techniques do not yet exist. A method of cooling using the hyperfine structure in the microwave radiation region has been analysed. Due to the long spontaneous lifetime (∼10 7 years) a special sequence of pulses is used to remove energy; thermalization proceeds by collisions. Extremely low temperatures can be achieved as determined by the pulse length. Cooling times of several minutes are required for BEC.
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