Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Defect Theory description of weakly bound levels and Feshbach
  resonances in LiRb   The multichannel quantum defect theory (MQDT) in combination with the frame
transformation (FT) approach is applied to model the Fano-Feshbach resonances
measured for $^{7}$Li$^{87}$Rb and $^{6}$Li$^{87}$Rb [Marzok {\it et al.} Phys.
Rev. A {\bf 79} 012717 (2009)]. The MQDT results show a level of accuracy
comparable to that of previous models based on direct, fully numerical
solutions of the the coupled channel Schr\"odinger equations (CC). Here, energy
levels deduced from 2-photon photoassociation spectra for $^{7}$Li$^{85}$Rb are
assigned by applying the MQDT approach, obtaining the bound state energies for
the coupled channel problem. Our results confirm that MQDT yields a compact
description of photoassociation observables as well as the Fano-Feshbach
resonance positions and widths.

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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
16
The categories of this paper are: stat
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The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
12
The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
2
The categories of this paper are: math
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The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
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The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci