We perform magnetically assisted Sisyphus laser cooling of the triatomic free radical strontium monohydroxide (SrOH). This is achieved with principal optical cycling in rotationally closed P(N′′=1) branch either X˜2Σ+(000)↔A˜2Π1/2(000) or X˜2Σ+(000)↔B˜2Σ+(000) vibronic transitions. Molecules lost into excited vibrational states during process are repumped back through B˜(000) state for both (100) level Sr-O stretching mode and (0200) bending mode. The transverse temperature a SrOH molecular...

We demonstrate significantly improved magneto-optical trapping of molecules using a very slow cryogenic beam source and RF modulated DC magnetic fields. The MOT confines $1.1(3) \times 10^5$ CaF at density $4(1) 10^6$ cm$^{-3}$, which is an order magnitude greater than previous molecular MOTs. Near Doppler-limited temperatures $340(20)$ $\mu$K are attained. achieved enables future work to directly load optical tweezers create arrays for quantum simulation.

We report three-dimensional trapping of an oxide molecule (YO), using a radio-frequency magneto-optical trap (MOT). The total number molecules loaded is $\sim$1.5$\times10^4$ , with temperature 7(1)~mK. This diversifies the frontier that are laser coolable and paves way for second-stage narrow-line cooling in this to microkelvin regime. Futhermore, new challenges creating 3-D MOT YO resolved here indicate MOTs more complex non-linear should be feasible as well.

We report direct laser cooling of a symmetric top molecule, reducing the transverse temperature beam calcium monomethoxide (CaOCH$_3$) to $1.8\pm0.7$ mK while addressing two distinct nuclear spin isomers. These results open path efficient production ultracold chiral molecules and conclusively demonstrate that by using proper rovibronic optical transitions, both photon cycling complex can be as for much simpler linear species.

Abstract Doppler and Sisyphus cooling of 174 YbOH are achieved studied. This polyatomic molecule has high sensitivity to physics beyond the Standard Model represents a new class species for future high-precision probes T-violating physics. The transverse temperature beam is reduced by nearly two orders magnitude < 600 μ K phase-space density increased factor > 6 via cooling. We develop full numerical model laser find excellent agreement with data. project that magneto-optical trapping...

We report non-destructive imaging of optically trapped calcium monofluoride (CaF) molecules using in-situ $\Lambda$-enhanced gray molasses cooling. $200$ times more fluorescence is obtained compared to destructive on-resonance imaging, and the remain at a temperature $20\,\mu\text{K}$. The achieved number scattered photons makes possible single-shot detection single with high fidelity.

We demonstrate a 1D magneto-optical trap of the polar free radical calcium monohydroxide (CaOH). A quasiclosed cycling transition is established to scatter ∼103 photons per molecule, predominantly limited by interaction time. This enables radiative laser cooling CaOH while compressing molecular beam, leading significant increase in on axis beam brightness and reduction temperature from 8.4 1.4 mK.Received 29 January 2020Accepted 9 March 2020DOI:https://doi.org/10.1103/PhysRevLett.124.133201©...

Bioaerosols are known to be an important transmission pathway for SARS-CoV-2. We report a framework estimating the risk of transmitting SARS-CoV-2 via aerosols in laboratory and office settings, based on exponential dose-response model analysis air flow purification typical heating, ventilation, conditioning (HVAC) systems. High-circulation HVAC systems with high-efficiency particulate (HEPA) filtration dramatically reduce exposure virus indoor surgical masks or N95 respirators further...

We report a generally applicable computational and experimental approach to determine vibronic branching ratios in linear polyatomic molecules the 10−5 level, including for nominally symmetry-forbidden transitions. These methods are demonstrated CaOH YbOH, showing approximately two orders of magnitude improved sensitivity compared with previous state art. Knowledge at this level is needed successful deep laser cooling broad range molecular species.

Laser induced electronic excitations that spontaneously emit photons and decay directly to the initial ground state ("optical cycling transitions") are used in quantum information precision measurement for initialization readout. To extend this primarily atomic technique organic compounds, we theoretically investigate optical of alkaline earth phenoxides their functionalized derivatives. We find cycle leakage due wavefunction mismatch is low these species, can be further suppressed by using...

We study optical cycling in the polar free radical calcium monohydroxide (CaOH) and establish an experimental path towards scattering $\ensuremath{\sim}{10}^{4}$ photons. report rovibronic branching ratio measurements with precision at $\ensuremath{\sim}{10}^{\ensuremath{-}4}$ level observe weak symmetry-forbidden decays to bending modes nonzero vibrational angular momentum. Calculations are excellent agreement these predict additional decay pathways. Additionally, we perform high-resolution...

Rapid and repeated photon cycling has enabled precision metrology the development of quantum information systems using atoms simple molecules. Extending optical to structurally complex molecules would provide new capabilities in these areas, as well ultracold chemistry. Increased molecular complexity, however, makes realizing closed transitions more difficult. Building on already established strong diatomic, linear triatomic, symmetric top molecules, recent work pointed way larger including...

The authors report on a series of new laser spectroscopic measurements the lowest-lying electronic states YbOCH${}_{3}$, molecule that is interest for laboratory tests fundamental physics, in particular precision parity and time-reversal-symmetry violation. results indicate YbOCH${}_{3}$ suited to cooling, opening up range potential precision-measurement experiments could set limits theories beyond standard model.

We report a magneto-optical trap of strontium monohydroxide (SrOH) containing 2000(600) molecules at temperature 1.2(3) mK. The lifetime is 91(9) ms, which limited by decay to optically unaddressed vibrational states. This provides the foundation for future sub-Doppler cooling and optical trapping SrOH, polyatomic molecule suited precision searches physics beyond standard model including new CP violating particles ultralight dark matter. also identify important features in this system that...

We present a practical roadmap to achieve optical cycling and laser cooling of asymmetric top molecules (ATMs). Our theoretical analysis describes how reduced molecular symmetry, as compared diatomic symmetric nonlinear molecules, plays role in photon scattering. methods circumvent limitations on rapid these systems. calculate vibrational branching ratios for diverse set find that many species within broad class can be effectively cooled with manageable number lasers. also describe...

Medium resolution (Δν̃ ∼ 3 GHz) laser-induced fluorescence (LIF) excitation spectra of a rotationally cold sample YbOH in the 17300–17950 cm–1 range have been recorded using two-dimensional (excitation and dispersed fluorescence) spectroscopy. High (Δλ 0.65 nm) (DLIF) radiative decay curves numerous bands detected medium LIF were recorded. The vibronic energy levels X̃2Σ+ state predicted discrete variable representation approach compared with observations. analyzed to produce lifetimes. DLIF...

We report the production and spectroscopic characterization of strontium(I) phenoxide (SrOC6H5 or SrOPh) variants featuring electron-withdrawing groups designed to suppress vibrational excitation during spontaneous emission from electronically excited state. Optical cycling closure these species, which is decoupling state changes optical decay, found by dispersed laser-induced fluorescence spectroscopy be high, in accordance with theoretical predictions. A high-resolution, rotationally...

We present a high-resolution laser spectroscopic study of the Ã2B2-X̃2A1 and B̃2B1-X̃2A1 transitions calcium(I) phenoxide, CaOPh (CaOC6H5). The rotationally resolved band systems are analyzed using an effective Hamiltonian model accurately modeled as independent perpendicular (b- or c-type) transitions. structure calcium monophenoxide is compared to previously observed Ca-containing radicals, implications for direct cooling discussed. This work demonstrates that functionalization aromatic...

We demonstrate and characterize Zeeman-Sisyphus (ZS) deceleration of a beam ytterbium monohydroxide (YbOH). Our method uses combination large magnetic fields ($\sim$ 2.5 T) optical spin-flip transitions to decelerate molecules while scattering only $\sim$ 10 photons per molecule. study the challenges associated with presence internal molecular perturbations among excited electronic states discuss methods used overcome these challenges, including modified ZS decelerator using microwave transitions.

We propose diatomic molecules built from gold and carbon-group atoms as promising candidates for optical cycling precision measurements. show that this class of ($\mathrm{Au}X,X=\mathrm{C},\mathrm{Si},\mathrm{Ge},\mathrm{Sn},\mathrm{Pb}$) features laser-accessible electronic transitions with nearly diagonal Franck-Condon factors. The $^{2}\mathrm{\ensuremath{\Pi}}_{1/2}$ ground states can be easily polarized in the laboratory frame have near-zero magnetic moments, valuable quantum science...

Molecular design principles provide guidelines for augmenting a molecule with smaller group of atoms to realize desired property or function. We demonstrate that these concepts can be used create an optical cycling center attached number aromatic ligands, allowing the scattering many photons from resulting molecules without changing molecular vibrational states. further indicate ability expand this work. This represents significant step towards quantum functional group, which may serve as...

We demonstrate with a RF-MOT the one dimensional, transverse magneto-optical compression of cold beam calcium monofluoride (CaF). By continually alternating magnetic field direction and laser polarizations trap, photon scattering rate $2\pi \times$0.4 MHz is achieved. A 3D model for this RF-MOT, validated by agreement data, predicts capture velocity CaF 5 m/s.