Conversion between triplet pair states is controlled by molecular coupling in pentadithiophene thin films.

In singlet fission (SF) the initially formed correlated triplet pair state, (TT), may evolve toward independent triplet excitons or higher spin states of the (TT) species. The latter result is often considered undesirable from a light harvesting perspective but may be attractive for quantum information sciences (QIS) applications, as the final exciton pair can be spin-entangled and magnetically active with relatively long room temperature decoherence times. In this study we use ultrafast transient absorption (TA) and time-resolved electron paramagnetic resonance (TR-EPR) spectroscopy to monitor SF and triplet pair evolution in a series of alkyl silyl-functionalized pentadithiophene (PDT) thin films designed with systematically varying pairwise and long-range molecular interactions between PDT chromophores.

Slow charge transfer from pentacene triplet states at the Marcus optimum.

Singlet fission promises to surpass the Shockley-Queisser limit for single-junction solar cell efficiency through the production of two electron-hole pairs per incident photon. However, this promise has not been fulfilled because singlet fission produces two low-energy triplet excitons that have been unexpectedly difficult to dissociate into free charges. To understand this phenomenon, we study charge separation from triplet excitons in polycrystalline pentacene using an electrochemical series of 12 different guest electron-acceptor molecules with varied reduction potentials.

Dynamics of singlet fission and electron injection in self-assembled acene monolayers on titanium dioxide.

We employ a combination of linear spectroscopy, electrochemistry, and transient absorption spectroscopy to characterize the interplay between electron transfer and singlet fission dynamics in polyacene-based dyes attached to nanostructured TiO. For triisopropyl silylethynyl (TIPS)-pentacene, we find that the singlet fission time constant increases to 6.5 ps on a nanostructured TiO surface relative to a thin film time constant of 150 fs, and that triplets do not dissociate after they are formed.

C5 Palsy After Cervical Spine Surgery: A Multicenter Retrospective Review of 59 Cases.

Study Design: A multicenter, retrospective review of C5 palsy after cervical spine surgery.

Objective: Postoperative C5 palsy is a known complication of cervical decompressive spinal surgery. The goal of this study was to review the incidence, patient characteristics, and outcome of C5 palsy in patients undergoing cervical spine surgery.

A Multicenter Study of the Presentation, Treatment, and Outcomes of Cervical Dural Tears.

Study Design: Retrospective multicenter case series study.

Objective: Because cervical dural tears are rare, most surgeons have limited experience with this complication. A multicenter study was performed to better understand the presentation, treatment, and outcomes following cervical dural tears.

Rare Complications of Cervical Spine Surgery: Pseudomeningocoele.

Study Design: This study was a retrospective, multicenter cohort study.

Objectives: Rare complications of cervical spine surgery are inherently difficult to investigate. Pseudomeningocoele (PMC), an abnormal collection of cerebrospinal fluid that communicates with the subarachnoid space, is one such complication.

Exploring consumer functioning in High Dependency Units and Psychiatric Intensive Care Units: Implications for mental health occupational therapy.

Background/aim: Consumers admitted to High Dependency Units (HDUs) or Psychiatric Intensive Care Units (PICUs) experience very significant functional difficulties. These can make it challenging to deliver targeted occupational therapy interventions. This study was established to analyse previously collected data to better understand consumer functioning in HDUs and PICUs.