General Metrology

• NIST Standard Reference Data Products
• NIST Physical Laboratory
• National Physical Laboratory (UK)

• Bureau International des Poids et Mesures (Sèvres, France)
• Sweden National Laboratory for Mass
• APS : Precision Measurement and Fundamental Constants
• Atomic Mass Data Center
• i-mass.com : International Mass Spectrometry Web Resource

A few other groups doing mass spectrometry and working with ion traps:

• PTMS at U. Washington, USA
• SMILETRAP, Stockholm, Sweden
• EUROTRAP at GSI in Darmstadt, Germany
• EXOTRAPS Collaboration
• SHIPTRAP at GSI in Darmstadt, Germany
• ISOLTRAP at ISOLDE at CERN , Switzerland
• MISTRAL at ISOLDE at CERN , Switzerland

Other groups doing related precision measurements:

• S. Chu (Stanford)
• T.W. Hänsch (MPG, Garching, Germany)
• Gamma-ray wavelengths measurements , (NIST +ILL)

APAC = Atomic Physics at ACcelerators
CPEM = Conference on Precision Electromagnetic Measurements
DAMOP = APS meeting of the Division of Atomic Physics
ENAM = Exotic Nuclei and Atomic Masses
ICAP = International Conference on Atomic Physics
PSAS = Precision Measurements on Simple Atomic Systems
TCPFP = Trapped Particles and Fundamental Atomic Physics