scholarly journals Driven-state relaxation of a coupled qubit-defect system in spin-locking measurements

2020 ◽  
Vol 102 (10) ◽  
Author(s):  
Leonid V. Abdurakhimov ◽  
Imran Mahboob ◽  
Hiraku Toida ◽  
Kosuke Kakuyanagi ◽  
Yuichiro Matsuzaki ◽  
...  
Keyword(s):  
Defect System ◽  
Spin Locking

scholarly journals Short-range Li diffusion vs. long-range ionic conduction in nanocrystalline lithium peroxide Li2O2—the discharge product in lithium-air batteries

2014 ◽  
Vol 7 (8) ◽  
pp. 2739-2752 ◽  
Author(s):  
A. Dunst ◽  
V. Epp ◽  
I. Hanzu ◽  
S. A. Freunberger ◽  
M. Wilkening
Keyword(s):  
Short Range ◽  
Ionic Conduction ◽  
High Energy ◽  
Ion Dynamics ◽  
Nmr Relaxometry ◽  
Lithium Peroxide ◽  
Discharge Product ◽  
Energy Ball ◽  
Spin Locking ◽  
Lithium Air Batteries

Conductivity spectroscopy and 7Li spin-locking NMR relaxometry reveal enhanced ion dynamics in nanocrystalline Li2O2 prepared by high-energy ball milling.

Spatial selection in NMR by spin-locking

1978 ◽  
Vol 11 (6) ◽  
pp. L223-L226 ◽  
Author(s):  
R A Wind ◽  
J H N Creyghton ◽  
D J Ligthelm ◽  
J Smidt
Keyword(s):  
Spatial Selection ◽  
Spin Locking

scholarly journals Theoretical investigations of quantum correlations in NMR multiple-pulse spin-locking experiments

2018 ◽  
Vol 17 (4) ◽  
Author(s):  
S. A. Gerasev ◽  
A. V. Fedorova ◽  
E. B. Fel’dman ◽  
E. I. Kuznetsova
Keyword(s):  
Quantum Correlations ◽  
Multiple Pulse ◽  
Theoretical Investigations ◽  
Spin Locking

Fourier energy analysis of Kikuchi patterns for investigation of defect system of diamond crystals

2021 ◽  
Author(s):  
Ihor Fodchuk ◽  
Serhii Ivakhnenko ◽  
Vasyl Tkach ◽  
Serhii Balovsyak ◽  
Mykola Solodkyi ◽  
...  
Keyword(s):  
Energy Analysis ◽  
Diamond Crystals ◽  
Defect System

NMR Studies of the Order and Dynamics of Dipalmitoylphosphatidylchoiine Bilayers as a Function of Pressure

1996 ◽  
Author(s):  
Ana Jonas ◽  
Xiangdong Peng
Keyword(s):  
Liquid Crystalline ◽  
Relaxation Times ◽  
Lateral Diffusion ◽  
Lattice Relaxation ◽  
Pressure Effects ◽  
Spin Lattice Relaxation ◽  
2H Nmr ◽  
Spin Lattice ◽  
Spin Locking ◽  
Nmr Methods

We have used 2H NMR methods to examine the order and dynamics of dipalmitoylphosphatidylcholine (DPPC) in multilamellar and small unilamellar vesicles in water as a function of pressure. Multipulse 2H NMR techniques were used with selectively deuterated DPPC on both chains at positions C-2, C-9, or C-13, to obtain lineshapes, spin-lattice relaxation times (T1), and spin-spin relaxation times (T2) at 50 °C from 1 bar to 5.2 kbar pressure. This pressure range allowed us to explore the phase behavior of DPPC from the liquid crystalline (LC) phase through various gel phases (Gl, Gll, Glll, GX), including the interdigited Gi phase. Pressure has an ordering effect: on all chain segments in all the phases. In the LC phase, the order parameter (SCD) decreases from C-2 > C-9 > C-13, while in the gel phases SCD decreases from C-9 > C-13 > C-2, indicating that in the gel phases the middle segments of the chains are more restricted in their motions than the ends. In the LC phase, T1 and T2 values for all segments decrease with pressure and have an order from C-13 > C-9 > C-2. These results suggest that similar conformational motions and molecular rotational motions occur in the LC state in all segments, but have increased amplitudes and frequencies toward the methyl ends. At the phase transitions, discontinuities and abrupt reversal of the slopes for the T1 or T2 dependences on pressure indicate major changes in motional modes and rates for DPPC molecules in the different structures. In the second part of this study, we have measured the lateral diffusion of DPPC in sonicated vesicles in D2O as a function of pressure. The spin-lattice relaxation rate in the rotating frame T−11p was plotted as a function of the square root of the spin-locking field angular frequency (ω1)1/2, and the lateral diffusion coefficient (D) was calculated from the slope. Pressure effects are observed on lateral diffusion in the LC phase (D = 5.4 − 2 × 10−9 cm2 seconds, from 1 to 300 bar) but are negligible in the GI phase (D ≈ 1.0 × 10−9 cm2 seconds, from 400 to 800 bar).

Artifacts in T1ρ-weighted imaging: correction with a self-compensating spin-locking pulse

2003 ◽  
Vol 162 (1) ◽  
pp. 113-121 ◽  
Author(s):  
Sridhar R. Charagundla ◽  
Arijitt Borthakur ◽  
John S. Leigh ◽  
Ravinder Reddy
Keyword(s):  
Spin Locking
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