Phys. Rev. A 79, 053409 (2009) [5 pages]Millimeter-wave rubidium Rydberg van der Waals spectroscopyReceived 12 December 2008; published 12 May 2009 We have observed the diatomic nsns→ns(n+1)s→(n+1)s(n+1)s microwave transitions of pairs of cold Rb Rydberg atoms for 36<n<48. The ns(n+1)s state has by far the largest van der Waals shift due to its near degeneracy with the nearby np3/2np3/2 state. In fact, the energy difference and the van der Waals shift change sign at n=38 and we observe shifts of both signs. The combined excitation of the ns(n+1)s and (n+1)s(n+1)s states leads to an unusual line shape which can be described by a three-level Floquet model. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.79.053409
DOI:
10.1103/PhysRevA.79.053409
PACS:
32.80.Ee, 33.20.Bx, 33.70.Jg
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