Title :
Accuracy of the fine-structure constant
Author :
Kinoshita, Toichiro
Author_Institution :
Newman Lab., Cornell Univ., Ithaca, NY, USA
fDate :
4/1/1989 12:00:00 AM
Abstract :
The fine-structure constant α can be determined with a precision of better than a few parts in 107 in four independent ways. These methods are based on the AC Josephson effect, the quantized Hall effect, the muonium hyperfine structure, and the electron anomalous magnetic moment. A determination of α based on an improved theoretical calculation and on the Penning trap measurement of the electron anomalous magnetic moments has now reached a precision exceeding 10-8. Its implications for physics and metrology are discussed
Keywords :
atomic fine structure; constants; AC Josephson effect; Penning trap measurement; electron anomalous magnetic moment; fine-structure constant; metrology; muonium hyperfine structure; physics; quantized Hall effect; Electromagnetic measurements; Electron traps; Hall effect; Helium; Hydrogen; Josephson effect; Magnetic moments; Metrology; Physics computing; Protons;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
