Edward Purcell and Norman Ramsey:
Cosmology and the Atomic Clock
Sculptures celebrating the research that used the 21 cm (1.420 405 751 GHz) hyperfine transition in atomic hydrogen: Not only to study the distribution of matter in the universe but also to provide a highly precise standard of time.
In the n=1 state of atomic hydrogen, the electron spin may be aligned either parallel (F=1) or antiparallel (F=0) to the spin of the proton nucleus. Transitions between these two hyperfine states occur at a well-defined microwave frequency. The energy levels, and the manner in which they vary with the strength of an externally-applied magnetic field are shown in the famous Breit-Rabi diagram:
This suggests the form for a door pull:
which on double doors would be of the form:
and as seen from a distance (click on image for larger view):
Going further, one can easily argue that the 21 cm line of hydrogen warrants a prominent, outdoor sculpture as a reminder of its significance. Here, with a figure to indicate human scale, is a maquette for such a sculpture.