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Title: Production of rovibronic-ground-state RbCs molecules via two-photon-cascade decay

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review A
Additional Journal Information:
Journal Volume: 91; Journal Issue: 2; Journal ID: ISSN 1050-2947
American Physical Society
Country of Publication:
United States

Citation Formats

Shimasaki, Toshihiko, Bellos, Michael, Bruzewicz, C. D., Lasner, Zack, and DeMille, David. Production of rovibronic-ground-state RbCs molecules via two-photon-cascade decay. United States: N. p., 2015. Web. doi:10.1103/PhysRevA.91.021401.
Shimasaki, Toshihiko, Bellos, Michael, Bruzewicz, C. D., Lasner, Zack, & DeMille, David. Production of rovibronic-ground-state RbCs molecules via two-photon-cascade decay. United States. doi:10.1103/PhysRevA.91.021401.
Shimasaki, Toshihiko, Bellos, Michael, Bruzewicz, C. D., Lasner, Zack, and DeMille, David. 2015. "Production of rovibronic-ground-state RbCs molecules via two-photon-cascade decay". United States. doi:10.1103/PhysRevA.91.021401.
title = {Production of rovibronic-ground-state RbCs molecules via two-photon-cascade decay},
author = {Shimasaki, Toshihiko and Bellos, Michael and Bruzewicz, C. D. and Lasner, Zack and DeMille, David},
abstractNote = {},
doi = {10.1103/PhysRevA.91.021401},
journal = {Physical Review A},
number = 2,
volume = 91,
place = {United States},
year = 2015,
month = 2

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevA.91.021401

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Cited by: 20works
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  • We report the preparation of a rovibronic ground-state molecular quantum gas in a single hyperfine state and, in particular, the absolute lowest quantum state. This addresses the last internal degree of freedom remaining after the recent production of a near quantum degenerate gas of molecules in their rovibronic ground state, and provides a crucial step towards full control over molecular quantum gases. We demonstrate a scheme that is general for bialkali polar molecules and allows the preparation of molecules in a single hyperfine state or in an arbitrary coherent superposition of hyperfine states. The scheme relies on electric-dipole, two-photon microwavemore » transitions through rotationally excited states and makes use of electric nuclear quadrupole interactions to transfer molecular population between different hyperfine states.« less
  • The presence of shape resonances due to tunneling through the centrifugal barrier modifies strongly the dynamics of cold atom scattering. As shown on the example of the ground and lowest triplet electronic states of the {sup 85}Rb{sup 133}Cs molecule, the crucial parameter is, as usual for cold collisions, the scattering length. A general description of shape resonances of diatomic molecules is given from three simple single channel asymptotic models, whose respective performances are discussed. The first model, which consists of a R{sup -6} potential limited at short range by a repulsive wall, positioned to reproduce the s-wave scattering length, accountsmore » satisfactorily for the main system-independent properties of shape resonances. Introduction in the model of energy- and angular-momentum-dependent nodal lines specific to the inner part of the potential greatly improves its efficiency. When the energy and angular momentum dependence of the nodal lines cannot be deduced from full potential calculations or from experiment, a rough, but universal, estimate of these properties is obtained by extending the R{sup -6} behavior of the potential up to the origin.« less
  • Rotational line strengths of two-photon absorption (TPA) processes in symmetric top molecules in the gas phase are developed by angular momentum theory. Experimentally accessible polarization states and frequencies of the photons are considered case by case. For TPA processes of identical photon frequency, parallel linearly polarized photons and same-sense circularly polarized photons form a complete polarization study. In the absence of resonance-enhanced intermediate states, TPA of nonidentical photon frequencies normally does not give new spectral features which are forbidden in identical TPA, because of the highly unfavorable weighting factors involving the intermediate state energies. High resolution studies of TPA, especiallymore » in the Doppler-free regime where features can be further resolved, is an alternative and can be more fruitful than polarization study for excited state assignments. A more general selection rule for TPA is that the initial and final states must have identical overall rovibronic symmetry. The Jahn--Teller effect induced, j-type doubling can be probed directly by TPA. As resonance condition is approached, features of different rotational structures ( selection rules) within a two-photon allowed electronic band can occur through a nonadiabatic intermediate state. The polarization ratios for near-resonant TPA, which is useful for both intermediate and final state assignments, are also presented.« less
  • We present high resolution photoassociation spectroscopy of RbCs molecules in (2)0{sup +} long-range state below the Rb(5S{sub 1/2}) + Cs(6P{sub 1/2}) asymptote and derive the corresponding C{sub 6} coefficient, which is used to revise the potential energy curves. The excited state molecules are produced in a dual-species dark spontaneous force optical trap and detected by ionizing ground state molecules after spontaneous decay, using a high sensitive time-of-flight mass spectrum. With the help of resonance-enhanced two-photon ionization technique, we obtain considerable high resolution photoassociation spectrum with rovibrational states, some of which have never been observed before. By applying the LeRoy-Bernstein method,more » we assign the vibrational quantum numbers and deduce C{sub 6} coefficient, which agrees with the theoretical value of A{sup 1}Σ{sup +} state correlated to Rb(5S{sub 1/2}) + Cs(6P{sub 1/2}) asymptote. The obtained C{sub 6} coefficient is used to revise the long-range potential energy curve for (2)0{sup +} state, which possesses unique A − b mixing characteristic and can be a good candidate for the production of absolutely ground state molecule.« less
  • Bound-state molecules can be photoassociated directly from ultracold free-atom pairs by excitation to a purely repulsive electronic state. The process is explained on the basis of quantum unitarity: the initially free-scattering state is transformed by an impulsive light pulse to a deformed superposition which contains bound-state components. For pulse durations which are short compared to the ultracold dynamics, the maximal rate of photoassociation was found to be determined by the initial stationary distribution of scattering states of the atom pairs. The process was simulated for an ultracold gas of {sup 87}Rb with a temperature of T=44 {mu}K and a densitymore » of {approx_equal}10{sup 11} cm{sup -3}. Transform-limited pulses maximize the photoassociation, yielding {approx}1 bound molecule per pulse. Coherent control calculated by a local control scheme can increase the photoassociation yield by two orders of magnitude.« less