Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ramsey interferometry with atoms and molecules: two-body versus
  many-body phenomena   We discuss the frequency and visibility of atom-molecule Ramsey fringes
observed in recent experiments by Claussen et al.[Phys. Rev. A 67, 060701
(2003)]. In these experiments a 85Rb Bose-Einstein condensate was exposed to a
sequence of magnetic field pulses on the high field side of the 155 G Feshbach
resonance. The observed oscillation frequencies largely agree with the
theoretically predicted magnetic field dependence of the binding energy of the
highest excited diatomic vibrational state, except for a small region very
close to the singularity of the scattering length. Our analytic treatment of
the experiment, as well as our dynamical simulations, follow the magnitude of
the measured oscillation frequencies as well as the visibilities of the Ramsey
fringes. We show that significant deviations from a purely binary dynamics,
with an associated binding frequency, occur when the spatial extent of the
molecular wave function becomes comparable with the mean distance between the
atoms in the dilute gas. The experiments thus clearly identify the conditions
under which diatomic molecules may be identified as a separate entity of the
gas or, conversely, when the concept of binary physics in a many-body
environment is bound to break down.

15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc