We report production of ultracold $X{\phantom{\rule{0.16em}{0ex}}}^{1}{\ensuremath{\Sigma}}^{+}({v}^{\ensuremath{'}\ensuremath{'}}=0)$ NaCs molecules via photoassociation. We utilize a combination of spectroscopic techniques to determine formation pathways and label ground-state samples. Efficient free-bound excitation occurs due to coupling between $B{\phantom{\rule{0.16em}{0ex}}}^{1}\ensuremath{\Pi}$ and neighboring electronic states in the $\text{Na}\phantom{\rule{0.28em}{0ex}}3S+\text{Cs}\phantom{\rule{0.28em}{0ex}}6P$ complex. An $f$ -wave shape resonance contributes to formation of a rotationally pure sample of $X{\phantom{\rule{0.16em}{0ex}}}^{1}{\ensuremath{\Sigma}}^{+}({v}^{\ensuremath{'}\ensuremath{'}}=0,{J}^{\ensuremath{'}\ensuremath{'}}=1)$ molecules.We report production of ultracold $X{\phantom{\rule{0.16em}{0ex}}}^{1}{\ensuremath{\Sigma}}^{+}({v}^{\ensuremath{'}\ensuremath{'}}=0)$ NaCs molecules via photoassociation. We utilize a combination of spectroscopic techniques to determine formation pathways and label ground-state samples. Efficient free-bound excitation occurs due to coupling between $B{\phantom{\rule{0.16em}{0ex}}}^{1}\ensuremath{\Pi}$ and neighboring electronic states in the $\text{Na}\phantom{\rule{0.28em}{0ex}}3S+\text{Cs}\phantom{\rule{0.28em}{0ex}}6P$ complex. An $f$-wave shape resonance contributes to formation of a rotationally pure sample of $X{\phantom{\rule{0.16em}{0ex}}}^{1}{\ensuremath{\Sigma}}^{+}({v}^{\ensuremath{'}\ensuremath{'}}=0,{J}^{\ensuremath{'}\ensuremath{'}}=1)$ molecules.

Physical Review ADec 5, 201163 citations

Experimental Studies of High Lying Electronic State of NaCs

Carl Faust, Joshua Jones, Seth Ashman +4 more

Bulletin of the American Physical SocietyJun 5, 20120 citations

Spin-forbidden c 3Σ+(Ω=1)←X 1Σ+ transition in NaCs: Investigation of the Ω=1 state in hot and cold environments

A. Grochola, Pawel Kowalczyk, J. Szczepkowski +4 more

Comprehensive spectroscopic studies of hot and ultracold samples of NaCs molecules were combined to complete the investigation of the $(3)\ensuremath{\Omega}=1$ $\ensuremath{\leftarrow}$ $X$ ${}^{1}{\ensuremath{\Sigma}}^{+}$ transition for the NaCs molecule. Polarization labeling, photoassociation, and pulsed laser depletion spectroscopy were used to collect data on rovibrational levels of the $(3)\ensuremath{\Omega}=1$ state [here described as the $c$ ${}^{3}{\ensuremath{\Sigma}}^{+}$ state in Hund's case (a) notation]. The highest observed level was $v=72$ located $~$5 GHz below the atomic asymptote Na( $3{ }^{2}{S}_{1/2}$ ) $+$ Cs( $6{ }^{2}{P}_{3/2}$ ). Approximately 1400 levels were used to construct the potential energy curve of the $(3)\ensuremath{\Omega}=1$ state for the full range of interatomic distances.Comprehensive spectroscopic studies of hot and ultracold samples of NaCs molecules were combined to complete the investigation of the $(3)\ensuremath{\Omega}=1$ $\ensuremath{\leftarrow}$ $X$ ${}^{1}{\ensuremath{\Sigma}}^{+}$ transition for the NaCs molecule. Polarization labeling, photoassociation, and pulsed laser depletion spectroscopy were used to collect data on rovibrational levels of the $(3)\ensuremath{\Omega}=1$ state [here described as the $c$ ${}^{3}{\ensuremath{\Sigma}}^{+}$ state in Hund's case (a) notation]. The highest observed level was $v=72$ located $~$5 GHz below the atomic asymptote Na($3{ }^{2}{S}_{1/2}$) $+$ Cs($6{ }^{2}{P}_{3/2}$). Approximately 1400 levels were used to construct the potential energy curve of the $(3)\ensuremath{\Omega}=1$ state for the full range of interatomic distances.

Physical Review AJul 18, 201121 citations

Experimental Studies of Interacting Electronic States in NaCs

Carl Faust

Jan 1, 20141 citation

Formation of ultracold, highly polar X1Σ+NaCs molecules

Christopher Haimberger, Jan Kleinert, Patrick Zabawa +2 more

We present photoassociation spectroscopy of ultracold NaCs molecules formed in a dual-species magneto-optical trap. Excited-state molecules are formed in states correlating to the Na(3S 1/2 )+Cs(6P 3/2 ) asymptote. We assign the most prominent observed vibrational progression to the Ω=2 long range state based on a comparison with ab initio potentials. Molecules are secondarily excited before decaying to deeply bound levels of the electronic ground X 1 Σ + state where they are ionized and detected by time-of-flight mass spectroscopy.We present photoassociation spectroscopy of ultracold NaCs molecules formed in a dual-species magneto-optical trap. Excited-state molecules are formed in states correlating to the Na(3S 1/2 )+Cs(6P 3/2 ) asymptote. We assign the most prominent observed vibrational progression to the Ω=2 long range state based on a comparison with ab initio potentials. Molecules are secondarily excited before decaying to deeply bound levels of the electronic ground X 1 Σ + state where they are ionized and detected by time-of-flight mass spectroscopy.

New Journal of PhysicsMay 14, 200937 citations

\text{Na}\phantom{\rule{0.28em}{0ex}}3S+\text{Cs}\phantom{\rule{0.28em}{0ex}}6P

complex. An

f

-wave shape resonance contributes to formation of a rotationally pure sample of $X{\phantom{\rule{0.16em}{0ex}}}^{1}{\ensuremath{\Sigma}}^{+}({v}^{\ensuremath{'}\ensuremath{'}}=0,{J}^{\ensuremath{'}\ensuremath{'}}=1)$ molecules.

Comprehensive spectroscopic studies of hot and ultracold samples of NaCs molecules were combined to complete the investigation of the $(3)\ensuremath{\Omega}=1$ $\ensuremath{\leftarrow}$

X

${}^{1}{\ensuremath{\Sigma}}^{+}$ transition for the NaCs molecule. Polarization labeling, photoassociation, and pulsed laser depletion spectroscopy were used to collect data on rovibrational levels of the $(3)\ensuremath{\Omega}=1$ state [here described as the

c

${}^{3}{\ensuremath{\Sigma}}^{+}$ state in Hund's case (a) notation]. The highest observed level was

v=72

located $~$5 GHz below the atomic asymptote Na(

3{ }^{2}{S}_{1/2}

)

+

Cs(

6{ }^{2}{P}_{3/2}

). Approximately 1400 levels were used to construct the potential energy curve of the $(3)\ensuremath{\Omega}=1$ state for the full range of interatomic distances.