Archive for the ‘Uncategorized’ Category

Centrifuge spectroscopy probes extreme rotational states: PCCP article in Chemistry World

A new spectroscopic technique for studying electronically excited molecules at very high angular momentum has been developed and tested by scientists in Canada.

The team, from the University of British Columbia, headed by Valery Milner, have used an optical centrifuge to excite oxygen to rotational states that otherwise can’t be reached. An optical centrifuge combines two laser pulses to create an intense electric field which undergoes angular acceleration to drive molecules into the remarkable angular momentum states. The super rotation state reached for oxygen in the study is equivalent to heating the molecule to 50,000K, a temperature that is too hot for the molecule to survive. A spectroscopic technique called resonance-enhanced multi-photon ionisation was combined with the centrifuge and by carefully controlling and calibrating the rotational speed of the centrifuge a spectrum can be viewed as a two-dimensional function of photon energy and angular momentum.

‘It greatly simplifies the spectra,’ says Aleksey Korobenko, the lead scientist on this study. ‘Even when the photon energy branches are overlapping, you can track one by one the rotational peaks which you can’t otherwise separate out.’

Interested to know more?

Read the full article by Rachel Wood in Chemistry World here…

Read the article in PCCP:

Rotational spectroscopy with an optical centrifuge
Aleksey Korobenko, Alexander A. Milner, John W. Hepburn and Valery Milner
Phys. Chem. Chem. Phys., 2014, Advance Article
DOI: 10.1039/C3CP54598A, Paper

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Imaging molecular dynamics – PCCP themed collection, Issue 2

Graphical abstract: Front coverPCCP is delighted to present its current issue which includes an excellent collection of articles on the theme of  Imaging molecular dynamics, Guest Edited by Mike Ashfold and David Parker. Read their editorial to find out more about some of the latest developments in this exciting field.

The outside front cover features a A velocity map imaging study of the photodissociation of the à state of ammoniaby Javier D. Rodríguez, Marta G. González, Luis Rubio-Lago and Luis Bañares.

Imaging molecular dynamics themed collection features a broad range of Papers and Communications and features the following Perspective articles:

Velocity map imaging of ion–molecule reactions
Roland Wester
DOI: 10.1039/C3CP53405G

Fast sensors for time-of-flight imaging applications
Claire Vallance, Mark Brouard, Alexandra Lauer, Craig S. Slater, Edward Halford, Benjamin Winter, Simon J. King, Jason W. L. Lee, Daniel E. Pooley, Iain Sedgwick, Renato Turchetta, Andrei Nomerotski, Jaya John John and Laura Hill
DOI: 10.1039/C3CP53183J

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This week’s HOT articles

Take a look at this week’s HOT articles, which are free to access for a limited time: Graphical abstract: Electrochemistry at nanometer-sized electrodes

Electrochemistry at nanometer-sized electrodes
Shengli Chen and Yuwen Liu
DOI: 10.1039/C3CP53773K, Perspective

Nanoscale resolution scanning thermal microscopy using carbon nanotube tipped thermal probes
Peter D. Tovee, Manuel E. Pumarol, Mark C. Rosamond, Robert Jones, Michael C. Petty, Dagou A. Zeze and Oleg V. Kolosov
DOI: 10.1039/C3CP53047G, Paper

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This week’s HOT articles

Take a look at this week’s selection…

Cost-effective CO2 capture based on in silico screening of zeolites and process optimization
M. M. Faruque Hasan, Eric L. First and Christodoulos A. Floudas

New insights into the dynamics and morphology of P3HT:PCBM active layers in bulk heterojunctions

Jan-Michael Y. Carrillo, Rajeev Kumar, Monojoy Goswami, Bobby G. Sumpter and W. Michael Brown  

Effective management of passive layers using composite cathodes in solid state magnesium batteries

Mosarrat Perween, Rajeev Gupta, Babulal Rebary, Vaibhav Kulshrestha and Divesh N. Srivastava

The relative roles of electrostatics and dispersion in the stabilization of halogen bonds
Kevin E. Riley and Pavel Hobza  

Toward the creation of stable, functionalized metal clusters
Yuichi Negishi, Wataru Kurashige, Yoshiki Niihori and Katsuyuki Nobusada  

Effective shell layer thickness of platinum for oxygen reduction reaction alloy catalysts
Naoto Todoroki, Yu Asakimori and Toshimasa Wadayama  

Effect of interactions with the chaperonin cavity on protein folding and misfolding
Anshul Sirur, Michael Knott and Robert B. Best

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This week’s HOT articles

You can take a look at the excellent articles we have selected this week by clicking on the links below:

DNA photoreacts by nucleobase ring cleavage to form labile isocyanates
Laura Buschhaus, Josefin Rolf and Karl Kleinermanns   
DOI: 10.1039/C3CP51552D

Emerging applications of conjugated polymers in molecular imaging

Junwei Li, Jie Liu, Chen-Wei Wei, Bin Liu, Matthew O’Donnell and Xiaohu Gao   
DOI: 10.1039/C3CP51763B

Sensitized excited free-radical processes as read–write tools: impact on non-linear lithographic processes
Stefania Impellizzeri, Kevin G. Stamplecoskie and Juan. C. Scaiano  
DOI: 10.1039/C3CP51723C

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PCCP Board member reflects on the future of chemistry research in India

PCCP Advisory Board member Professor Elangannan Arunan has co-authored a report in Angewandte Chemie on the excellent potential of Indian chemistry and how it can be best realised.

The authors ideas include improving access to start-up grants for new faculty members and encouraging the funding of new, untested ideas.

Check out these excellent PCCP Perspectives (co-)authored by researchers working in India:

Design and development of quantum dots and other nanoparticles based cellular imaging probe

Nikhil R. Jana
DOI: 10.1039/C0CP00726A

Do N-heterocyclic aromatic rings prefer π-stacking?
Mridula Guin , G. Naresh Patwari , S. Karthikeyan and Kwang S. Kim
DOI: 10.1039/C0CP02015J

The hydrogen bond: a molecular beam microwave spectroscopist’s view with a universal appeal
Mausumi Goswami and E. Arunan
DOI: 10.1039/B907708A

You may also be interested to read Prof. Arunan’s “Editor’s Choice” selection of articles in PCCP on a theme of bonding, reaction kinetics and dynamics.

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