Molecular beam study of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>a</mml:mi><mml:msup><mml:mspace width="0.16em" /><mml:mn>3</mml:mn></mml:msup><mml:msup><mml:mo>Σ</mml:mo><mml:mo>+</mml:mo></mml:msup></mml:mrow></mml:math>state of NaK up to the dissociation limit

Temelkov, I.; Knöckel, H.; Pashov, A.; Tiemann, E.

doi:10.1103/physreva.91.032512

Cited by 18 publications

(35 citation statements)

References 39 publications

(57 reference statements)

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“…These potentials and calculated energy levels are used in the present study as a guide for our spectroscopic search for perturbations in 23 Na 40 K, which has not been studied before due to 40 K's low natural abundance of 0.01%. Recently, two-photon spectroscopy in the 'traditional direction' from the absolute singlet to low-lying triplet ground states of NaK was performed on 23 Na 39 K in a molecular beam [58,59].…”

Section: Introductionmentioning

confidence: 99%

Two-photon pathway to ultracold ground state molecules of²³Na⁴⁰K

2015

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We report on high-resolution spectroscopy of ultracold fermionic 23 Na 40 K Feshbach molecules, and identify a two-photon pathway to the rovibrational singlet ground state via a resonantly mixed B 1 Π ∼ c 3 Σ + intermediate state. Photoassociation in a 23 Na-40 K atomic mixture and one-photon spectroscopy on 23 Na 40 K Feshbach molecules reveal about 20 vibrational levels of the electronically excited c 3 Σ + state. Two of these levels are found to be strongly perturbed by nearby B 1 Π levels via spinorbit coupling, resulting in additional lines of dominant singlet character in the perturbed complexThe dominantly singlet level is used to locate the absolute rovibrational singlet ground state v J X 0, 0 1 Σ | = = 〉 + via Autler-Townes spectroscopy. We demonstrate coherent two-photon coupling via dark state spectroscopy between the predominantly triplet Feshbach molecular state and the singlet ground state. Its binding energy is measured to be 5212.0447(1) cm −1 , a thousand-fold improvement in accuracy compared to previous determinations. In their absolute singlet ground state, 23 Na 40 K molecules are chemically stable under binary collisions and possess a large electric dipole moment of 2.72 Debye. Our work thus paves the way towards the creation of strongly dipolar Fermi gases of NaK molecules. New J. Phys. 17 (2015) 075016 J W Park et al New J. Phys. 17 (2015) 075016 J W Park et al Jm H Jm B m J J ( 1) , ( 4 ) J J J Z B B μ = + describing the projection of the one unit of angular momentum along the internuclear axis onto the magnetic field in the laboratory z-axis; m J denotes the z-projection of J ⃗ . In particular, the magnetic moment of a J m 1, 1 J | = = 〉 state is 2 New J. Phys. 17 (2015) 075016 J W Park et al

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Section: Introductionmentioning

confidence: 99%

Two-photon pathway to ultracold ground state molecules of²³Na⁴⁰K

2015

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“…3.1. Local model for the excited state manifold In our experiment, we are specifically interested in a detailed understanding of the previously located [15]…”

Section: Excited State Spectroscopymentioning

confidence: 99%

“…From spectroscopic investigations [15] the transition energies from the atomic scattering threshold in the a 3 Σ + potential to the dominantly | P = ñ B v , 8 1 and dominantly | S = ñ + c v , 30 3 states are expected to be about 12 242.927 cm −1 for the triplet state and about 12 242.017 cm −1 for the singlet state at a magnetic field of 150 G. In the following we will refer to the states with a dominant triplet character as triplet and to the ones with dominantly singlet character as singlet.…”

Section: One-photon Spectroscopymentioning

confidence: 99%

“…KRb [7] and fermionic 23 Na 40 K [8] ground state molecules have been created using states in the c 3 Σ + and B 1 Π potentials. Additionally, ground state molecules for fermionic In the case of 23 Na 39 K, suitable transitions for the creation of ground state molecules have so far only been investigated experimentally in hot beam experiments accessing rotational states with N6 [15]. Moreover, the work [15] does not include hyperfine structure and offset magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

“…However, the hyperfine structure still remains untreated although it is crucial for a successful STIRAP transfer [13]. In this paper, we present hyperfine resolved spectroscopic investigations of the 23 Na 39 K molecule at bias magnetic fields for strongly mixed states known from [15,16].…”

Section: Introductionmentioning

confidence: 99%

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A pathway to ultracold bosonic ²³Na³⁹K ground state molecules

et al. 2019

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We spectroscopically investigate a pathway for the conversion of 23 Na 39 K Feshbach molecules into rovibronic ground state molecules via stimulated Raman adiabatic passage. Using photoassociation spectroscopy from the diatomic scattering threshold in the a 3 Σ + potential, we locate the resonantly mixed electronically excited intermediate stateswhich, due to their singlet-triplet admixture, serve as an ideal bridge between predominantly a 3 Σ + Feshbach molecules and pure X 1 Σ + ground state molecules. We investigate their hyperfine structure and present a simple model to determine the singlet-triplet coupling of these states. Using Autler-Townes spectroscopy, we locate the rovibronic ground state of the 23 Na 39 K molecule (| S = = ñ + X v N , 0, 0 1 ) and the second rotationally excited state N=2 to unambiguously identify the ground state. We also extract the effective transition dipole moment from the excited to the ground state. Our investigations result in a fully characterized scheme for the creation of ultracold bosonic 23 Na 39 K ground state molecules. 23 Na 40 K have been created using excited states in energetically higher D 1 Π and d 3 Π potentials [13]; not shown in figure 1(a).

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