On the transverse confinement of radiatively slowed molecular beams

DeMille, David; Barry, John F.; Edwards, Eustace; Norrgard, Eric; Steinecker, Matthew

doi:10.1080/00268976.2013.793833

Cited by 19 publications

(18 citation statements)

References 33 publications

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“…The branching ratios to both states are known, however, and the loss allows us to calibrate the number of photons scattered per molecule. Using the measured branching ratios, 1.0(0.25)×10 −3 to the X 300 ( )level and 0.8(3)×10 −3 to the X 01 0 1 ( )level [67], we determine that the molecules scatter an average of -+ 500 75 300 photons. The scattering rate is measured independently, via images of fluorescence over the molecules' path, to be Γ sc ≈1.5×10 6 s −1 .…”

Section: Resultsmentioning

confidence: 99%

Laser-cooled polyatomic molecules for improved electron electric dipole moment searches

et al. 2020

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Doppler and Sisyphus cooling of 174 YbOH are achieved and studied. This polyatomic molecule has high sensitivity to physics beyond the Standard Model and represents a new class of species for future high-precision probes of new T-violating physics. The transverse temperature of the YbOH beam is reduced by nearly two orders of magnitude to < 600 μK and the phase-space density is increased by a factor of > 6 via Sisyphus cooling. We develop a full numerical model of the laser cooling of YbOH and find excellent agreement with the data. We project that laser cooling and magneto-optical trapping of long-lived samples of YbOH molecules are within reach and these will allow a high sensitivity probe of the electric dipole moment of the electron. The approach demonstrated here is easily generalized to other isotopologues of YbOH that have enhanced sensitivity to other symmetryviolating electromagnetic moments.

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Section: Resultsmentioning

confidence: 99%

Laser-cooled polyatomic molecules for improved electron electric dipole moment searches

et al. 2020

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“…Future work is expected to give access to larger trapped molecular samples at higher density. For example, the flux of slow molecules passing through the trapping region may be increased by chirping the slowing laser frequency [35], by slowing more efficiently via stimulated rather than spontaneous forces [36], or by applying transverse confinement to the molecular beam during the slowing [37]. One method that may increase the trap depth employs a rapid synchronous reversing of the MOT beam circular polarizations and the magnetic field gradient (the RF MOT).…”

Section: Resultsmentioning

confidence: 99%

Improved magneto–optical trapping of a diatomic molecule

et al. 2015

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We present experimental results from a new scheme for magnetooptically trapping strontium monofluoride (SrF) molecules, which provides increased confinement compared to our original work. The improved trap employs a new approach to magneto-optical trapping presented by M. Tarbutt, arXiv preprint 1409.0244, which provided insight for the first time into the source of the restoring force in magneto-optical traps (MOTs) where the cycling transition includes dark Zeeman sublevels (known as type-II MOTs). We measure a radial spring constant 20× greater than in our original work with SrF, comparable to the spring constants reported in atomic type-II MOTs. We achieve a trap lifetime τ MOT = 136(2) ms, over 2× longer than originally reported for SrF. Finally, we demonstrate further cooling of the trapped molecules by briefly increasing the trapping lasers' detunings. Our trapping scheme remains a straightforward extension of atomic techniques and marks a step towards the direct production of large, dense, ultracold molecular gases via laser cooling.

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“…This would lead to an eEDM sensitivity surpassing the current limit of d e <1.1×10 −29 ecm [1]. This sensitivity could be further increased by additional technical improvements, such as beam focusing [81], transverse confinement [82], and 'few photon' slowing techniques [83,84].…”

Section: Discussionmentioning

confidence: 98%

Enhanced molecular yield from a cryogenic buffer gas beam source via excited state chemistry

et al. 2020

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We use narrow-band laser excitation of Yb atoms to substantially enhance the brightness of a cold beam of YbOH, a polyatomic molecule with high sensitivity to physics beyond the standard model (BSM). By exciting atomic Yb to the metastable 3 P 1 state in a cryogenic environment, we significantly increase the chemical reaction cross-section for collisions of Yb with reactants. We characterize the dependence of the enhancement on the properties of the laser light, and study the final state distribution of the YbOH products. The resulting bright, cold YbOH beam can be used to increase the statistical sensitivity in searches for new physics utilizing YbOH, such as electron electric dipole moment and nuclear magnetic quadrupole moment experiments. We also perform new quantum chemical calculations that confirm the enhanced reactivity observed in our experiment and compare reaction pathways of Yb( 3 P) with the reactants H 2 O and H 2 O 2 . More generally, our work presents a broad approach for improving experiments that use cryogenic molecular beams for laser cooling and precision measurement searches of BSM physics.

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On the transverse confinement of radiatively slowed molecular beams

Cited by 19 publications

References 33 publications

Laser-cooled polyatomic molecules for improved electron electric dipole moment searches

Laser-cooled polyatomic molecules for improved electron electric dipole moment searches

Improved magneto–optical trapping of a diatomic molecule

Enhanced molecular yield from a cryogenic buffer gas beam source via excited state chemistry

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