Quantum spin dynamics

Research group

Research theme

Sub department

About

Determination of the thermal stability of the fullerene dimers C120, C120O, and C120O2.

J Phys Chem B 110:34 (2006) 16979-16981

Authors:

Jinying Zhang, Kyriakos Porfyrakis, Mark R Sambrook, Arzhang Ardavan, G Andrew D Briggs

Abstract:

We have produced the fullerene dimers C(120), C(120)O, and C(120)O(2) by a high-speed vibration milling technique. The thermal stability of C(120), C(120)O, and C(120)O(2) has been studied in the temperature range 150-350 degrees C for up to 4 h under vacuum. The bridging oxygen atoms were found to substantially increase the stability of the fullerene dimer molecules.
More details from the publisher
More details

Determination of the thermal stability of the fullerene dimers C 120, C120O, and C120O2

Journal of Physical Chemistry B 110:34 (2006) 16979-16981

Authors:

J Zhang, K Porfyrakis, MR Sambrook, A Ardavan, GAD Briggs

Abstract:

We have produced the fullerene dimers C120, C120O, and C120O2 by a high-speed vibration milling technique. The thermal stability of C120, C120O, and C 120O2 has been studied in the temperature range 150-350°C for up to 4 h under vacuum. The bridging oxygen atoms were found to substantially increase the stability of the fullerene dimer molecules. © 2006 American Chemical Society.
More details from the publisher

Morphology of the nonspherically decaying radiation beam generated by a rotating superluminal source

(2006)

Authors:

Houshang Ardavan, Arzhang Ardavan, John Singleton, Joseph Fasel, Andrea Schmidt
More details from the publisher

Multifrequency millimeter wave study of excited energy states in the high-spin molecule Cr10 (OMe) 20 (O2 CCMe3) 10

Physical Review B - Condensed Matter and Materials Physics 73:21 (2006)

Authors:

S Sharmin, A Ardavan, SJ Blundell, O Rival, P Goy, EJL McInnes, DM Low

Abstract:

We report multifrequency high-field millimeter-wave magneto-optical measurements on the high-spin molecule, Cr10 (OMe) 20 (O2 CCMe3) 10. We find that at temperatures above 15 K and at magnetic fields above 6 T, the simple ESR spectrum expected for a single molecule magnet is markedly altered. Our data strongly suggest the presence of a higher spin excited state multiplet lying only about 10 K above the ground state. © 2006 The American Physical Society.
More details from the publisher
More details

Davies electron-nuclear double resonance revisited: enhanced sensitivity and nuclear spin relaxation.

J Chem Phys 124:23 (2006) 234508

Authors:

Alexei M Tyryshkin, John JL Morton, Arzhang Ardavan, SA Lyon

Abstract:

Over the past 50 years, electron-nuclear double resonance (ENDOR) has become a fairly ubiquitous spectroscopic technique, allowing the study of spin transitions for nuclei which are coupled to electron spins. However, the low spin number sensitivity of the technique continues to pose serious limitations. Here we demonstrate that signal intensity in a pulsed Davies ENDOR experiment depends strongly on the nuclear relaxation time T(1n), and can be severely reduced for long T(1n). We suggest a development of the original Davies ENDOR sequence that overcomes this limitation, thus offering dramatically enhanced signal intensity and spectral resolution. Finally, we observe that the sensitivity of the original Davies method to T(1n) can be exploited to measure nuclear relaxation, as we demonstrate for phosphorous donors in silicon and for endohedral fullerenes N@C(60) in CS(2).
More details from the publisher
More details