Na clusters containing 10 to less than 1000 metal sodium atoms and blisters containing xenon inclusions were formed in NaCl crystal specimens prepared by xenon ion implantation to single crystal NaCl with Auences more...Na clusters containing 10 to less than 1000 metal sodium atoms and blisters containing xenon inclusions were formed in NaCl crystal specimens prepared by xenon ion implantation to single crystal NaCl with Auences more than or equal to 2×10^(16)/cm^(2)at the energy of 36keV.Experiments indicated that on the condition of xenon ion Auences more than or equal to 1×10^(17)/cm^(2)the xenon inside the inclusions formed in NaCl crystal specimens is in solid state and the solid state molecules NaXe are formed through the Combination of Xe with Na in Na clusters.The chemical shift of ^(23)Na in solid state molecules NaXe relative to 23Na in single crystal NaCl was measured and is equal to-17ppm.展开更多
^(129)Xe magnetic resonance imaging in a magnetic Geld of 4,7 T and at 311K with laser polarization in the same Geld is reported.In order to overcome the self-diffusion effect that destroys the transverse magnetizatio...^(129)Xe magnetic resonance imaging in a magnetic Geld of 4,7 T and at 311K with laser polarization in the same Geld is reported.In order to overcome the self-diffusion effect that destroys the transverse magnetization very rapidly,gradient echo is used instead of spin echo.Spectroscopic image is also obtained.Two-dimensional spin nutation spectroscopy under steady state was used to calibrate π/2 pulse of ^(129)Xe in gaseous state.In addition,we have measured the relaxation time of laser-polarized gaseous ^(129)Xe using the saturation-recovery method.展开更多
基金the Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Chinese Academy of Science under Contract 971503the Educational Foundation of Civil Aviation Administration of China under Contract 97-3-040.
文摘Na clusters containing 10 to less than 1000 metal sodium atoms and blisters containing xenon inclusions were formed in NaCl crystal specimens prepared by xenon ion implantation to single crystal NaCl with Auences more than or equal to 2×10^(16)/cm^(2)at the energy of 36keV.Experiments indicated that on the condition of xenon ion Auences more than or equal to 1×10^(17)/cm^(2)the xenon inside the inclusions formed in NaCl crystal specimens is in solid state and the solid state molecules NaXe are formed through the Combination of Xe with Na in Na clusters.The chemical shift of ^(23)Na in solid state molecules NaXe relative to 23Na in single crystal NaCl was measured and is equal to-17ppm.
基金Supported by the National Natural Science Foundation of China under Grant No.19574068.
文摘^(129)Xe magnetic resonance imaging in a magnetic Geld of 4,7 T and at 311K with laser polarization in the same Geld is reported.In order to overcome the self-diffusion effect that destroys the transverse magnetization very rapidly,gradient echo is used instead of spin echo.Spectroscopic image is also obtained.Two-dimensional spin nutation spectroscopy under steady state was used to calibrate π/2 pulse of ^(129)Xe in gaseous state.In addition,we have measured the relaxation time of laser-polarized gaseous ^(129)Xe using the saturation-recovery method.
