In photoassociation spectroscopy, the line intensities of a given vibrational progression exhibit zero-signal modulation reflecting the node structure of the $s$ -wave ground state wave function of two free colliding atoms. This leads to the determination of the scattering length. We performed photoassociation of cold Cs atoms polarized in the Zeeman sublevel $f\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4$ , ${m}_{f}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4$ . We analyzed the intensities of the lines associated with the ${\mathrm{Cs}}_{2}$ ${0}_{g}^{\ensuremath{-}}$ state dissociating to the ${6s}_{1/2}{+6p}_{3/2}$ asymptote. This yields a value of the Cs triplet state scattering length, ${a}_{T}{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{-}530a}_{0}$, while consistency requirements impose a value of the multipole ground state molecular coefficient, ${C}_{6}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}6510$ a.u.In photoassociation spectroscopy, the line intensities of a given vibrational progression exhibit zero-signal modulation reflecting the node structure of the $s$-wave ground state wave function of two free colliding atoms. This leads to the determination of the scattering length. We performed photoassociation of cold Cs atoms polarized in the Zeeman sublevel $f\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4$, ${m}_{f}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4$. We analyzed the intensities of the lines associated with the ${\mathrm{Cs}}_{2}$ ${0}_{g}^{\ensuremath{-}}$ state dissociating to the ${6s}_{1/2}{+6p}_{3/2}$ asymptote. This yields a value of the Cs triplet state scattering length, ${a}_{T}{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{-}530a}_{0}$, while consistency requirements impose a value of the multipole ground state molecular coefficient, ${C}_{6}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}6510$ a.u.

Physical Review LettersAug 14, 200040 citations

Photoassociation spectroscopy of ultra-cold long-range molecules

Nicolas Vanhaecke, D. Comparat, A. Crubellier +1 more

Spectroscopic study of so-called long-range molecules, with average interatomic distances much larger than usual for chemical bonds, is conveniently performed by photoassociation (PA) of ultracold atoms. We present here a review of our results obtained by one and two-photon PA spectroscopy of the Cs 2 molecule, using as intermediate the 0 g − and 1 u potentials correlated to the (6 s +6 p 3/2 ) asymptote. These results have been interpreted using an asymptotic theoretical approach, which was specifically build for such long-range molecules.Spectroscopic study of so-called long-range molecules, with average interatomic distances much larger than usual for chemical bonds, is conveniently performed by photoassociation (PA) of ultracold atoms. We present here a review of our results obtained by one and two-photon PA spectroscopy of the Cs 2 molecule, using as intermediate the 0 g − and 1 u potentials correlated to the (6 s +6 p 3/2 ) asymptote. These results have been interpreted using an asymptotic theoretical approach, which was specifically build for such long-range molecules.

Comptes Rendus PhysiqueMar 1, 20046 citations

Photoassociation of Ultracold Atoms: A New Spectroscopic Technique

William C. Stwalley, He Wang

Journal of Molecular SpectroscopyJun 1, 1999259 citations

In photoassociation spectroscopy, the line intensities of a given vibrational progression exhibit zero-signal modulation reflecting the node structure of the

s

-wave ground state wave function of two free colliding atoms. This leads to the determination of the scattering length. We performed photoassociation of cold Cs atoms polarized in the Zeeman sublevel

f\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4

{m}_{f}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4

. We analyzed the intensities of the lines associated with the

{\mathrm{Cs}}_{2}

${0}_{g}^{\ensuremath{-}}$ state dissociating to the

{6s}_{1/2}{+6p}_{3/2}

asymptote. This yields a value of the Cs triplet state scattering length, ${a}_{T}{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{-}530a}_{0}$, while consistency requirements impose a value of the multipole ground state molecular coefficient,

{C}_{6}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}6510

a.u.