scholarly journals Direct laser cooling of a symmetric top molecule

Science ◽  
2020 ◽  
Vol 369 (6509) ◽  
pp. 1366-1369 ◽  
Author(s):  
Debayan Mitra ◽  
Nathaniel B. Vilas ◽  
Christian Hallas ◽  
Loïc Anderegg ◽  
Benjamin L. Augenbraun ◽  
...  
Keyword(s):  
Small Molecules ◽  
Laser Cooling ◽  
Particle Physics ◽  
Complex Structure ◽  
Optical Tweezer ◽  
Polyatomic Molecules ◽  
Chiral Molecules ◽  
Direct Laser ◽  
Spin Isomers ◽  
Quantum Science

Ultracold polyatomic molecules have potentially wide-ranging applications in quantum simulation and computation, particle physics, and quantum chemistry. For atoms and small molecules, direct laser cooling has proven to be a powerful tool for quantum science in the ultracold regime. However, the feasibility of laser-cooling larger, nonlinear polyatomic molecules has remained unknown because of their complex structure. We laser-cooled the symmetric top molecule calcium monomethoxide (CaOCH3), reducing the temperature of ~104 molecules from 22 ± 1 millikelvin to 1.8 ± 0.7 millikelvin in one dimension and state-selectively cooling two nuclear spin isomers. These results demonstrate that the use of proper ro-vibronic transitions enables laser cooling of nonlinear molecules, thereby opening a path to efficient cooling of chiral molecules and, eventually, optical tweezer arrays of complex polyatomic species.

Direct Laser Cooling Schemes for the Triatomic SOH and SeOH Molecules Based on Ab Initio Electronic Properties

2020 ◽  
Author(s):  
Li Liu ◽  
Chuan-Lu Yang ◽  
Zhaopeng Sun ◽  
Meishan Wang ◽  
Xiano-Guang Ma
Keyword(s):  
Optical Properties ◽  
Ab Initio ◽  
Electronic Properties ◽  
Laser Cooling ◽  
Promising Method ◽  
Optical Scheme ◽  
Electronic And Optical Properties ◽  
Cold Molecules ◽  
Direct Laser

The direct laser cooling is a very promising method to obtain cold molecules for various applications. However, a molecule with satisfactory electronic and optical properties for the optical scheme is...

scholarly journals Global properties of physically interesting Lorentzian spacetimes

2016 ◽  
Vol 25 (14) ◽  
pp. 1650106
Author(s):  
Deloshan Nawarajan ◽  
Matt Visser
Keyword(s):  
Standard Model ◽  
Quantum Gravity ◽  
Particle Physics ◽  
Causal Structure ◽  
Complex Structure ◽  
Good Representation ◽  
Global Features ◽  
Metric Tensor ◽  
Global Issues ◽  
The Standard Model

Under normal circumstances most members of the general relativity community focus almost exclusively on the local properties of spacetime, such as the locally Euclidean structure of the manifold and the Lorentzian signature of the metric tensor. When combined with the classical Einstein field equations this gives an extremely successful empirical model of classical gravity and classical matter — at least as long as one does not ask too many awkward questions about global issues, (such as global topology and global causal structure). We feel however that this is a tactical error — even without invoking full-fledged “quantum gravity” we know that the standard model of particle physics is also an extremely good representation of some parts of empirical reality; and we had better be able to carry over all the good features of the standard model of particle physics — at least into the realm of semi-classical quantum gravity. Doing so gives us some interesting global features that spacetime should possess: On physical grounds spacetime should be space-orientable, time-orientable, and spacetime-orientable, and it should possess a globally defined tetrad (vierbein, or in general a globally defined vielbein/[Formula: see text]-bein). So on physical grounds spacetime should be parallelizable. This strongly suggests that the metric is not the fundamental physical quantity; a very good case can be made for the tetrad being more fundamental than the metric. Furthermore, a globally-defined “almost complex structure” is almost unavoidable. Ideas along these lines have previously been mooted, but much is buried in the pre- arXiv literature and is either forgotten or inaccessible. We shall revisit these ideas taking a perspective very much based on empirical physical observation.

scholarly journals Accurate prediction and measurement of vibronic branching ratios for laser cooling linear polyatomic molecules

2021 ◽  
Vol 155 (9) ◽  
pp. 091101
Author(s):  
Chaoqun Zhang ◽  
Benjamin L. Augenbraun ◽  
Zack D. Lasner ◽  
Nathaniel B. Vilas ◽  
John M. Doyle ◽  
...  
Keyword(s):  
Laser Cooling ◽  
Branching Ratios ◽  
Polyatomic Molecules ◽  
Accurate Prediction

Proposal for Laser Cooling of Complex Polyatomic Molecules

ChemPhysChem ◽  
2016 ◽  
Vol 17 (22) ◽  
pp. 3641-3648 ◽  
Author(s):  
Ivan Kozyryev ◽  
Louis Baum ◽  
Kyle Matsuda ◽  
John M. Doyle
Keyword(s):  
Laser Cooling ◽  
Polyatomic Molecules

scholarly journals Determination of CaOH and CaOCH3 vibrational branching ratios for direct laser cooling and trapping

2019 ◽  
Vol 21 (5) ◽  
pp. 052002 ◽  
Author(s):  
Ivan Kozyryev ◽  
Timothy C Steimle ◽  
Phelan Yu ◽  
Duc-Trung Nguyen ◽  
John M Doyle
Keyword(s):  
Laser Cooling ◽  
Branching Ratios ◽  
Laser Cooling And Trapping ◽  
Direct Laser

scholarly journals Nuclear spin isomers of guest molecules in H 2 @C 60 , H 2 O@C 60 and other endofullerenes

2013 ◽  
Vol 371 (1998) ◽  
pp. 20110628 ◽  
Author(s):  
Judy Y.-C. Chen ◽  
Yongjun Li ◽  
Michael Frunzi ◽  
Xuegong Lei ◽  
Yasujiro Murata ◽  
...  
Keyword(s):  
Small Molecules ◽  
Nuclear Spin ◽  
Spectroscopic Studies ◽  
Internal Environment ◽  
Guest Molecules ◽  
Spin Isomer ◽  
External Perturbations ◽  
Spin Isomers

Spectroscopic studies of recently synthesized endofullerenes, in which H 2 , H 2 O and other atoms and small molecules are trapped in cages of carbon atoms, have shown that although the trapped molecules interact relatively weakly with the internal environment they are nevertheless susceptible to appropriately applied external perturbations. These properties have been exploited to isolate and study samples of H 2 in C 60 and other fullerenes that are highly enriched in the para spin isomer. Several strategies for spin-isomer enrichment, potential extensions to other endofullerenes and possible applications of these materials are discussed.

Direct laser cooling of molecules

2018 ◽  
Vol 190 (03) ◽  
pp. 313-328 ◽  
Author(s):  
Timur A. Isaev
Keyword(s):  
Laser Cooling ◽  
Direct Laser

Long lifetime of single atom in optical tweezer with laser cooling

2010 ◽  
Author(s):  
Junmin Wang ◽  
Jun He ◽  
Baodong Yang ◽  
Tiancai Zhang ◽  
Kunchi Peng
Keyword(s):  
Laser Cooling ◽  
Optical Tweezer ◽  
Single Atom ◽  
Long Lifetime

scholarly journals Direct Laser Cooling to Bose-Einstein Condensation in a Dipole Trap

2019 ◽  
Vol 122 (20) ◽  
Author(s):  
Alban Urvoy ◽  
Zachary Vendeiro ◽  
Joshua Ramette ◽  
Albert Adiyatullin ◽  
Vladan Vuletić
Keyword(s):  
Laser Cooling ◽  
Einstein Condensation ◽  
Dipole Trap ◽  
Bose Einstein Condensation ◽  
Direct Laser ◽  
Bose Einstein
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