公开(公告)号：DE3167621D1

公开(公告)日：1985-01-17

申请号：DE3167621

申请日：1981-08-28

Applicant: IBM

Inventor： KENDRICK RAYMOND DAVID ,  WIND ROBERT ANTHONY ,  YANNONI COSTANTINO SHELDON

IPC: G01N24/08 ,  G01R33/20 ,  G01R33/30 ,  G01N24/04

Abstract: A method for adjusting the orientation of the rotation axis for a sample in a nuclear magnetic resonance (NMR) experiment includes using a field gradient in a specific direction with respect to the external magnetic field of the NMR experiment to establish a calibrated reference direction with which the rotation axis may be aligned. Preferably, the magnetic field gradient is at an angle of 54.7 DEG . A preferred embodiment of this invention includes automatic control steps in the method.

公开(公告)号：IT1150095B

公开(公告)日：1986-12-10

申请号：IT2672080

申请日：1980-12-18

Applicant: IBM

Inventor： HOFER DONALD CLIFFORD ,  KENDRICK RAYMOND DAVID ,  YANNONI COSTANTINO SHELDON

IPC: G01N24/08 ,  G01R33/20 ,  G01R33/46 ,  G01R

Abstract: A method and an apparatus for line narrowing in nuclear magnetic resonance (NMR) studies in solids is described. The method employs quasi-continuous amplitude modulation of an rf field (10) wherein the field is eliminated at intervals (18) for short periods of time at or about the time when the amplitude for both the maximum and minimum approach zero, these intervals creating windows where the NMR signal can be observed.

公开(公告)号：DE3070348D1

公开(公告)日：1985-04-25

申请号：DE3070348

申请日：1980-12-04

Applicant: IBM

Inventor： HOFER DONALD CLIFFORD ,  KENDRICK RAYMOND DAVID ,  YANNONI COSTANTINO SHELDON

IPC: G01R33/20 ,  G01N24/08 ,  G01R33/46

Abstract: A method and an apparatus for line narrowing in nuclear magnetic resonance (NMR) studies in solids is described. The method employs quasi-continuous amplitude modulation of an rf field (10) wherein the field is eliminated at intervals (18) for short periods of time at or about the time when the amplitude for both the maximum and minimum approach zero, these intervals creating windows where the NMR signal can be observed.

公开(公告)号：IT8026720D0

公开(公告)日：1980-12-18

申请号：IT2672080

申请日：1980-12-18

Applicant: IBM

Inventor： YANNONI COSTANTINO SHELDON ,  HOFER DONALD CLIFFORD ,  KENDRICK RAYMOND DAVID

IPC: G01N24/08 ,  G01R33/20 ,  G01R33/46 ,  G01R

Abstract: A method and an apparatus for line narrowing in nuclear magnetic resonance (NMR) studies in solids is described. The method employs quasi-continuous amplitude modulation of an rf field (10) wherein the field is eliminated at intervals (18) for short periods of time at or about the time when the amplitude for both the maximum and minimum approach zero, these intervals creating windows where the NMR signal can be observed.

公开(公告)号：DE2549788A1

公开(公告)日：1976-05-26

申请号：DE2549788

申请日：1975-11-06

Applicant: IBM

Inventor： VEEMAN WIEBREN SJOERD ,  YANNONI COSTANTINO SHELDON

IPC: G01R33/46 ,  H01F13/00 ,  G01N27/78

Abstract: A method of polarizing nuclei having a long relaxation time in a solid in a high DC magnetic field. The solid also contains nuclei having a short relaxation time. The method involves the step of applying a high DC magnetic field to the solid. Then the solid is swept with a radio frequency field which excites the nuclei with a short relaxation time thereby resulting in the polarization of the nuclei having a long relaxation time.