@article {3919, title = {Tritium nuclear magnetic resonance study of T-2, HT, and DT dissolved in nematic solvents}, journal = {Physical Review E}, volume = {55}, number = {1}, year = {1997}, note = {ISI Document Delivery No.: WD545Times Cited: 5Cited Reference Count: 25Part A}, month = {Jan}, pages = {496-503}, type = {Article}, abstract = {A tritium nuclear magnetic resonance study is carried out on the T-2, HT, and DT isotopomers of dihydrogen dissolved in various nematic phases, including a zero-electric-field-gradient mixture. Ab initio calculations are performed to reproduce the observed dipolar couplings. Within the framework of the {\textquoteright}{\textquoteright}mean-field{\textquoteright}{\textquoteright} approximation, the results provide support for a picture in which two independent contributions to the solute orientation can be distinguished. One contribution involves a liquid-crystal-dependent interaction between the mean solvent electric-field gradient and the solute molecular quadrupole moment. The other contribution is of unknown origin; however, it is essentially identical in all liquid crystals and it can be modeled adequately with a phenomenological mean-field interaction. A remarkable feature of this second interaction is that it causes the average orientation of the asymmetrical isotopomers, and especially of HT, to behave differently from the symmetrical species.}, keywords = {ELECTRIC-FIELD GRADIENTS, ENVIRONMENTS, LIQUID-CRYSTAL MIXTURES, MECHANISMS, METHANES, MOLECULAR-HYDROGEN, NMR, orientational order, SOLUTES}, isbn = {1063-651X}, url = {://A1997WD54500062}, author = {Burnell, E. E. and de Lange, C. A. and Segre, A. L. and Capitani, D. and Angelini, G. and Lilla, G. and Barnhoorn, J. B. S.} }