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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-4793
DTSTART:20180419T190000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T002703Z
LAST-MODIFIED:20180323T193026Z
LOCATION:5310 Chamberlin
SUMMARY:Ultracold Polyatomic Molecules via Laser Cooling – N Atoms T
 oo Many\, Atomic Physics Seminar\, Prof. John Doyle \, Harvard
DESCRIPTION:Triatomic molecules are deceptively simple. Even though th
 ere is only one additional atom compared to a diatomic molecule\, this
  leads to non-trivial additional motional degrees of freedom and new a
 ssociated quantum numbers. This\, plus the larger density of states\, 
 realizes a quantum object whose complexity leads to new chemistry and 
 physics research opportunities and concomitantly presents new challeng
 es in molecular control. The science opportunities include the develop
 ment of accurate and precise manipulation of chemical reactions and co
 llisions in a qualitatively more complex species. But the reach of tri
 atomics also includes dramatically improved\, novel approaches to sear
 ches for physics beyond the Standard Model\, and enhanced platforms fo
 r quantum computing using molecular tweezer arrays\, both of which are
  aided by the low lying bending modes present in triatomic molecules. 
 All of these research frontiers with triatomics\, and their symmetric 
 and asymmetric top brethren\, either require or are greatly enhanced b
 y chilling them to ultracold temperatures where they can be prepared i
 n exquisitely well-defined internal and external motional states. <br>
 
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\nThe recent experimental advances in direct la
 ser cooling of diatomic molecules and triatomic molecules clearly indi
 cates that full extension of laser tools - the creation of a magneto-o
 ptical trap (MOT) plus sub-Doppler cooling - to triatomic species shou
 ld be possible. Recently in our laboratory we achieved a magneto-optic
 al trap of diatomic molecules with CaF\, sub-Doppler cooling to 40 µK
 \, and loading of these molecules into an optical dipole trap. We also
  accomplished the first laser cooling and bichromatic force deflection
  of a polyatomic molecule\, using SrOH. In addition\, in 2016 we propo
 sed the laser cooling of more complex polyatomic molecules using the m
 ethods we have now demonstrated. In particular\, symmetric top molecul
 es like CaOCH3 (and\, possibly\, related asymmetric top molecules) loo
 k extremely promising for direct laser cooling. The experimental prosp
 ects for a MOT of CaOH\, YbOH\, and CaOCH3 will be discussed.    <br>

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URL:https://www.physics.wisc.edu/events/?id=4793
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