The definition of the second was later refined at the 1997 meeting of the BIPM to include the statement The revised definition seems to imply that the ideal atomic clock contains a single caesium atom at rest emitting a single frequency .
The definition of the second was later refined at the 1997 meeting of the BIPM to include the statement This definition refers to a caesium atom at rest at a temperature of 0 K . The revised definition would seem to imply that the ideal atomic clock would contain a single caesium atom at rest emitting a single frequency .