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SUMMARY:Conversion between singlet and triplet states in the strong and we
 ak coupling regimes. - Karl Börjesson\; University of Gothenburg
DTSTART:20190924T130000Z
DTEND:20190924T143000Z
UID:TALK129877@talks.cam.ac.uk
CONTACT:Elizabeth Tennyson
DESCRIPTION:Chemists can today synthesize virtually any molecule imaginabl
 e. By fine tuning the molecular structure\, optimized physical\, chemical\
 , or biological properties are routinely achieved. However\, even though m
 olecular optimization has reshaped the world we live in\, there is always 
 a point at which the laws of physics limits the performance of molecular s
 ystems. Tailoring of molecular properties can be achieved through strong c
 oupling between molecular states and the zero-point fluctuations of the el
 ectromagnetic field (vacuum field) [1]. The formed hybrid states (exciton 
 polaritons) have unique chemical and physical properties and can be viewed
  as a linear combination of light (vacuum field) and matter (molecules). I
  will present how the energy difference between singlet and triplet energy
  levels can be reduced by strong light matter interactions\, allowing for 
 a higher rate of reversed intersystem crossing [2]. I will further describ
 e how resonance energy transfer can be used for multiplicity conversion in
  the weak coupling regime [3]. The last part of my talk will be on triplet
 -triplet annihilation photon upconversion\, focusing on excimer formation 
 on the triplet surface\, which is a previously overlooked process in the c
 ommunity [4].\n \n[1] Hertzog\, Wang\, Mony and Börjesson\, Chem. Soc. Re
 v.\, 2019\, 48\, 937-961.\n[2] Stranius\, Hertzog and Börjesson\, Nat. Co
 mmun.\, 2018\, 9:2273.\n[3] Cravcenco\, Hertzog\, Ye\, Iqbal\, Mueller\, E
 riksson and Börjesson\, Sci. Adv. 2019\, accepted\n[4] Ye\, Gray\, Mårte
 nsson and Börjesson\, J. Am. Chem. Soc.\, 2019\, 14\, 124\, 9578-9584.\n
LOCATION:Kapitza Seminar Room\, Kapitza Building\, Cavendish Laboratory
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