Observation of the last bound levels near theNa2ground-state asymptote

Long-range coupling ofX1Σ+anda3Σ+Ferber1, Nikolayeva2, Tamanis3 et al. 2013Phys. Rev. A264990View full textAdd to dashboardCite

“…We do not discuss the structure beyond the position B, because the signals are very weak and we expect significant overlap of lines within the present spectral resolution. If one would like to continue with lower N and closer to the asymptote, other methods should be set up for better resolution than the Dopplerwidth, like molecular beams reported for Na 2 or K 2 and its asymptotic structure [20,21] or two-color photoassociation or Feshbach spectroscopy for several other molecules in ultracold ensembles.…”

Potassium ground-state scattering parameters and Born-Oppenheimer potentials from molecular spectroscopy

“…3, observed dark resonances for two levels (v ′′ , J ′′ ) are shown. A single resonance appears (left-hand side) for the coupling between (v = 41, appears by hyperfine coupling to the a 3 Σ + u state and is small for K 2 compared to Na 2 [8] or Cs 2 [31]. We could only resolve the splitting for vibrational levels v ′′ = 82 and higher.…”

“…It is also possible to measure the energy position of a larger number of weakly bound * Electronic address: christian.lisdat@ptb.de molecular levels with molecular spectroscopy, i.e., relative to a deeply bound molecular level [8,9], or by photoassociation spectroscopy relative to the atomic asymptote [10,11,12]. With such an approach, the determination of the asymptotic energy with respect to deeply bound levels and the long-range interaction coefficients of the potential are reliable if the number of observed levels is high and their binding energy is small.…”

Feshbach spectroscopy and analysis of the interaction potentials of ultracold sodium

“…(2) with R-dependent interaction potentials and coupling terms. The R-dependent functions are found in a fit to all known Feshbach resonances and existing spectroscopic data of more deeply bound rovibrational levels of the X 1 + g and a 3 + u potentials [8][9][10][11][12]. Data from conventional spectroscopy by Kush and Hessel [39] and by Barrow et al [40] for the ground-state X 1 + g potential and by Li Li et al [41] for the lowest triplet state a 3 + u potential are also included.…”

“…All three are s-wave resonances, that is, caused by molecular states with rotational quantum number l = 0. In parallel, Raman spectroscopy on a molecular beam of sodium dimers to locate the least-bound rovibrational states of the ground-state potentials X 1 + g and a 3 + u has been performed [8][9][10]. Scattering lengths [9] as well as Feshbach resonance positions [10] were extracted.…”