Title :
Frequency metrology in quantum degenerate helium
Author :
van Rooij, R. ; Borbely, J.S. ; Simonet, J. ; Hoogerland, M.D. ; Eikema, K.S.E. ; Rozendaal, R.A. ; Vassen, W.
Author_Institution :
LaserLaB, Vrije Univ., Amsterdam, Netherlands
fDate :
Aug. 28 2011-Sept. 1 2011
Abstract :
We report the first direct observation and high precision measurement of the triplet to singlet transition between the metastable states of helium. We obtain a precision of 8×10-12, providing a stringent test of two-electron quantum electrodynamic theory and of nuclear few-body theory. We use either the 4He or the 3He isotope, and from the isotope shift derive a new value for the 3He charge radius.
Keywords :
frequency measurement; helium; metastable states; quantum electrodynamics; radiation pressure; 3He; 4He; frequency metrology; isotope shift; metastable states; nuclear few body theory; quantum degenerate helium; triplet to singlet transition; two electron quantum electrodynamic theory; Atomic beams; Atomic clocks; Frequency measurement; Helium; Laser beams; Laser transitions; Measurement by laser beam;
Conference_Titel :
Quantum Electronics Conference & Lasers and Electro-Optics (CLEO/IQEC/PACIFIC RIM), 2011
Conference_Location :
Sydney, NSW
Print_ISBN :
978-1-4577-1939-4
DOI :
10.1109/IQEC-CLEO.2011.6194159
