Lei Lei1, Yuzhong Yao1, Jie Zhang1, Dale Tronrud1, Wei Kong1, Chengzhu Zhang2, Lan Xue2, Léo Dontot3, Mathias Rapacioli3. 1. Department of Chemistry , Oregon State University , Corvallis , Oregon 97331 , United States. 2. Department of Statistics , Oregon State University , Corvallis , Oregon 97331 , United States. 3. Laboratoire de Chimie et Physique Quantiques, LCPQ/IRSAMC, UMR5626 , Université de Toulouse (UPS) and CNRS , 118 Route de Narbonne , F-31062 Toulouse , France.
Abstract
We report electron diffraction of pyrene nanoclusters embedded in superfluid helium droplets. Using a least-squares fitting procedure, we have been able to separate the contribution of helium from those of the pyrene nanoclusters and determine the most likely structures for dimers and trimers. We confirm that pyrene dimers form a parallel double-layer structure with an interlayer distance of 3.5 Å and suggest that pyrene trimers form a sandwich structure but that the molecular planes are not completely parallel. The relative contributions of the dimers and trimers are ∼6:1. This work is an extension of our effort of solving structures of biological molecules using serial single-molecule electron diffraction imaging. The success of electron diffraction from an all-light-atom sample embedded in helium droplets offers reassuring evidence of the feasibility of this approach.
We report electron diffraction of pyrenenanoclusters embedded in superfluid n class="Chemical">helium droplets. Using a least-squares fitting procedure, we have been able to separate the contribution of helium from those of the pyrene nanoclusters and determine the most likely structures for dimers and trimers. We confirm that pyrene dimers form a parallel double-layer structure with an interlayer distance of 3.5 Å and suggest that pyrene trimers form a sandwich structure but that the molecular planes are not completely parallel. The relative contributions of the dimers and trimers are ∼6:1. This work is an extension of our effort of solving structures of biological molecules using serial single-molecule electron diffraction imaging. The success of electron diffraction from an all-light-atom sample embedded in helium droplets offers reassuring evidence of the feasibility of this approach.
Authors: James D Pickering; Benjamin Shepperson; Bjarke A K Hübschmann; Frederik Thorning; Henrik Stapelfeldt Journal: Phys Rev Lett Date: 2018-03-16 Impact factor: 9.161
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