Annual Meeting Optical Society of America

Spectroscopy of Na2 by Photoassociation of Ultracold Na in a Dark Magneto-Optical Trap

M.E. Wagshul, P.D. Lett, L. P. Ratliff, S. L. Rolston, William D. Phillips

Published Jan 1, 1993• 0 citations

Abstract

We have produced high resolution spectra of singly-excited Na2 produced by photoassociation in a dark MOT. Vibrational, rotational and hyperfine structure are clearly resolved.

DOI: 10.1364/oam.1993.pdp.1

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Annual Meeting Optical Society of America

Spectroscopy of Na2 by Photoassociation of Ultracold Na in a Dark Magneto-Optical Trap

M.E. Wagshul, P.D. Lett, L. P. Ratliff, S. L. Rolston, William D. Phillips

Published Jan 1, 1993• 0 citations

Publisher

Abstract

We have produced high resolution spectra of singly-excited Na2 produced by photoassociation in a dark MOT. Vibrational, rotational and hyperfine structure are clearly resolved.

DOI: 10.1364/oam.1993.pdp.1

Related papers

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Paul D. Lett, Kristian Helmerson, William D. Phillips +3 more

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The Journal of Chemical PhysicsAug 1, 1994100 citations

Observation of photoassociation of ultracold sodium and cesium at the asymptote Na (3S1/2) + Cs (6P1/2)

Jizhou Wu, Wenliang Liu, Xiaofeng Wang +5 more

We report on the production of ultracold heteronuclear NaCs* molecules in a dual-species magneto-optical trap through photoassociation. The electronically excited molecules are formed below the Na (3S1/2) + Cs (6P1/2) dissociation limit. 12 resonance lines are detected using trap-loss spectroscopy based on a highly sensitive modulation technique. The highest observed rovibrational level exhibits clear hyperfine structure, which is detected for the first time. This structure is simulated within a simplified model consisting of 4 coupled levels belonging to the initially unperturbed Hund’s case “a” electronic states, which have been explored in our previous work that dealt with the Na (3S1/2) + Cs (6P3/2) asymptote [W. Liu et al., Phys. Rev. A 94, 032518 (2016)].We report on the production of ultracold heteronuclear NaCs* molecules in a dual-species magneto-optical trap through photoassociation. The electronically excited molecules are formed below the Na (3S1/2) + Cs (6P1/2) dissociation limit. 12 resonance lines are detected using trap-loss spectroscopy based on a highly sensitive modulation technique. The highest observed rovibrational level exhibits clear hyperfine structure, which is detected for the first time. This structure is simulated within a simplified model consisting of 4 coupled levels belonging to the initially unperturbed Hund’s case “a” electronic states, which have been explored in our previous work that dealt with the Na (3S1/2) + Cs (6P3/2) asymptote [W. Liu et al., Phys. Rev. A 94, 032518 (2016)].

The Journal of Chemical PhysicsMay 2, 201813 citations

We have observed the spectrum of long range molecular states of singly excited

{\mathrm{Na}}_{2}

formed by photoassociation during ultracold associative ionization collisions of laser-cooled Na atoms. The low kinetic energy of the collision allows us to obtain very high resolution spectra and to observe states close to the dissociation limit. The spectrum shows regular vibrational series characteristic of the 1/

{\mathit{R}}^{3}

long range portion of the

{1}_{\mathit{g}}

potential (asymptotically

{\mathit{S}}_{1/2}

{\mathit{P}}_{3/2}

) as well as molecular hyperfine structure within these peaks. We extract potential parameters and compare with recent theory.

^{39}\mathrm{K}_{2}

molecule are observed within 8 ${\mathrm{cm}}^{\ensuremath{-}1}$ below the

4^{2}P_{\frac{3}{2}}

atomic limit. One of the series is identified as the ${0}_{g}^{\ensuremath{-}}$ pure long-range state and the other two are assigned to the

{0}_{u}^{+}

and

{1}_{g}

states. These photoassociative spectra are obtained by measuring reductions in the trap fluorescence due to trap loss induced by an intense photoassociation laser. By using a vapor-cell-dark MOT technique, we achieve atomic densities greater than

{10}^{11}

${\mathrm{cm}}^{\ensuremath{-}3}$, increasing our trap loss signals by an order of magnitude compared to a normal MOT.

We have measured the rate of production of

{\mathrm{Na}}_{2}^{+}

ions in collisions of ultracold Na atoms held in a magneto-optical trap (MOT) as a function of probe laser detuning using a single-color probe beam. The ion rate is measured with the atoms mainly in the

3S(f=2)

level (``bright MOT'') or the

3S(f=1)

level (``dark MOT''). Using recent experimental information about the doubly excited autoionizing states of

{\mathrm{Na}}_{2},

we find that the large structures in the first 5 GHz red of the atomic transition frequency are due to a doubly resonant excitation process with levels in the ${0}_{g}^{\ensuremath{-}}$ potential (asymptotically connected to

{3S}_{1/2}{+3P}_{3/2})

as the intermediate states, and levels in the ${0}_{u}^{\ensuremath{-}}$ and

{1}_{u}

potentials (asymptotically connected to

{3P}_{3/2}{+3P}_{3/2})

as the final autoionizing states. We can account for nearly all of the observed structure in this region of the spectra for both the bright and dark MOT.