scholarly journals Structure of the Photochemical Reaction Path Populated via Promotion of CF2I2into Its First Excited State

2009 ◽  
Vol 113 (40) ◽  
pp. 10767-10771 ◽  
Author(s):  
Patrick Z. El-Khoury ◽  
Alexander N. Tarnovsky ◽  
Igor Schapiro ◽  
Mikhail N. Ryazantsev ◽  
Massimo Olivucci
Keyword(s):  
Excited State ◽  
Photochemical Reaction ◽  
Reaction Path ◽  
First Excited State

scholarly journals Mapping the Complete Reaction Path of a Complex Photochemical Reaction

2018 ◽  
Vol 120 (18) ◽  
Author(s):  
Adam D. Smith ◽  
Emily M. Warne ◽  
Darren Bellshaw ◽  
Daniel A. Horke ◽  
Maria Tudorovskya ◽  
...  
Keyword(s):  
Photochemical Reaction ◽  
Reaction Path ◽  
Complete Reaction

scholarly journals Structural Transformations in Crystals Induced by Radiation and Pressure. Part 10. The Crystallographic Picture of Photochemical Behaviour of bi(anthracene-9,10-dimethylene) under High Pressure

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1031
Author(s):  
Julia Bąkowicz ◽  
Ilona Turowska-Tyrk
Keyword(s):  
High Pressure ◽  
Intermolecular Interactions ◽  
Photochemical Reaction ◽  
Molecular Orientation ◽  
Reaction Path ◽  
Structural Transformations ◽  
Initial Increase ◽  
Ambient Conditions ◽  
Photochemical Behaviour ◽  
Pressure Part

The results of the monitoring of the [4 + 4] photocycloaddition reaction path in single crystals of bi(anthracene-9,10-dimethylene) at high pressure are presented. The crystal structures for several steps of the phototransformation at 0.3 GPa and 1.0 GPa were determined and analysed. The applied high pressure did not halt the photochemical reaction and almost 100% of the product molecules were obtained, although the reaction was very slowly reversible similarly to that of ambient conditions. During the crystal phototransformation the intramolecular geometry, molecular orientation and intermolecular interactions of the reactant changed more and more towards the values observed for the product. The initial increase in the unit cell volume brought about by the photochemical reaction was diminished by high pressure. High pressure itself did not significantly influence the intramolecular geometry of the reactant and product molecules, but it influenced the intermolecular interactions.

Use of 2½ D imaging in analysis of NiTi martensite

1978 ◽  
Vol 36 (1) ◽  
pp. 610-611
Author(s):  
G. M. Michal
Keyword(s):  
Memory Effect ◽  
Monoclinic Phase ◽  
Reaction Path ◽  
Structural Characteristics ◽  
Salient Feature ◽  
Martensite Phase ◽  
Orientation Relationships ◽  
Low Symmetry ◽  
Hydride Phases ◽  
Unusual Shape

Several TEM investigations have attempted to correlate the structural characteristics to the unusual shape memory effect in NiTi, the consensus being the essence of the memory effect is ostensible manifest in the structure of NiTi transforming martensitic- ally from a B2 ordered lattice to a low temperature monoclinic phase. Commensurate with the low symmetry of the martensite phase, many variants may form from the B2 lattice explaining the very complex transformed microstructure. The microstructure may also be complicated by the enhanced formation of oxide or hydride phases and precipitation of intermetallic compounds by electron beam exposure. Variants are typically found in selfaccommodation groups with members of a group internally twinned and the twins themselves are often observed to be internally twinned. Often the most salient feature of a group of variants is their close clustering around a given orientation. Analysis of such orientation relationships may be a key to determining the nature of the reaction path that gives the transformation its apparently perfect reversibility.

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