Quantum state resolved velocity-map imaging spectroscopy: A new tool for collision dynamics at gas/self-assembled monolayer interfaces

2011 ◽  
Vol 150 ◽  
pp. 471 ◽  
Author(s):  
Joseph R. Roscioli ◽  
David J. Nesbitt
Keyword(s):  
Quantum State ◽  
Imaging Spectroscopy ◽  
Velocity Map Imaging ◽  
Collision Dynamics ◽  
Self Assembled Monolayer ◽  
Quantum State Resolved ◽  
Self Assembled

scholarly journals Direct observation of bimolecular reactions of ultracold KRb molecules

Science ◽  
2019 ◽  
Vol 366 (6469) ◽  
pp. 1111-1115 ◽  
Author(s):  
M.-G. Hu ◽  
Y. Liu ◽  
D. D. Grimes ◽  
Y.-W. Lin ◽  
A. H. Gheorghe ◽  
...  
Keyword(s):  
Quantum State ◽  
Chemical Reactions ◽  
Reaction Dynamics ◽  
Velocity Map Imaging ◽  
Bimolecular Reactions ◽  
Quantum State Resolved ◽  
Trapped Gas ◽  
Short Time ◽  
Transient Intermediates ◽  
Mutual Collision

Femtochemistry techniques have been instrumental in accessing the short time scales necessary to probe transient intermediates in chemical reactions. In this study, we took the contrasting approach of prolonging the lifetime of an intermediate by preparing reactant molecules in their lowest rovibronic quantum state at ultralow temperatures, thereby markedly reducing the number of exit channels accessible upon their mutual collision. Using ionization spectroscopy and velocity-map imaging of a trapped gas of potassium-rubidium (KRb) molecules at a temperature of 500 nanokelvin, we directly observed reactants, intermediates, and products of the reaction 40K87Rb + 40K87Rb → K2Rb2* → K2 + Rb2. Beyond observation of a long-lived, energy-rich intermediate complex, this technique opens the door to further studies of quantum-state–resolved reaction dynamics in the ultracold regime.

Self-Assembled Fluid Phase Floating Membranes with Tuneable Water Interlayers

2019 ◽  
Author(s):  
Luke Clifton ◽  
Nicoló Paracini ◽  
Arwel V. Hughes ◽  
Jeremy H. Lakey ◽  
Nina-Juliane Seinke ◽  
...  
Keyword(s):  
Fluid Phase ◽  
Interlayer Thickness ◽  
Supported Bilayers ◽  
Self Assembled Monolayer ◽  
High Coverage ◽  
Nano Technology ◽  
Surface Distance ◽  
Potential Applications ◽  
Self Assembled ◽  
Coated Surfaces

<p>We present a reliable method for the fabrication of fluid phase unsaturated bilayers which are readily self-assembled on charged self-assembled monolayer (SAM) surfaces producing high coverage floating supported bilayers where the membrane to surface distance could be controlled with nanometer precision. Vesicle fusion was used to deposit the bilayers onto anionic SAM coated surfaces. Upon assembly the bilayer to SAM solution interlayer thickness was 7-10 Å with evidence suggesting that this layer was present due to SAM hydration repulsion of the bilayer from the surface. This distance could be increased using low concentrations of salts which caused the interlayer thickness to enlarge to ~33 Å. Reducing the salt concentration resulted in a return to a shorter bilayer to surface distance. These accessible and controllable membrane models are well suited to a range of potential applications in biophysical studies, bio-sensors and Nano-technology.</p><br>

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