Longitudinal Relaxation Time Measurements in Hydrogen Gas Mixtures at Low Densities

1975 ◽  
Vol 53 (1) ◽  
pp. 1-4 ◽  
Author(s):  
Robin L. Armstrong ◽  
Kenneth E. Kisman ◽  
Wallace Kalechstein
Keyword(s):  
Relaxation Time ◽  
Spin Relaxation ◽  
Nuclear Spin ◽  
Molecular Nitrogen ◽  
Hydrogen Gas ◽  
Inelastic Collisions ◽  
Nuclear Spin Relaxation ◽  
Longitudinal Relaxation Time ◽  
Preliminary Information

Measurements of the longitudinal nuclear spin relaxation time through the region of the characteristic minimum at 49 MHz in mixtures of molecular hydrogen with the noble gases helium and argon and with molecular nitrogen are reported at 298 K. The data obtained serve as a further test of the basic approximations in the Bloom–Oppenheim theory and provide preliminary information concerning the role of inelastic collisions in the nuclear spin relaxation process.

ON THE NUCLEAR SPIN RELAXATION IN HYDROGEN GAS

1961 ◽  
Vol 39 (6) ◽  
pp. 870-880 ◽  
Author(s):  
G. T. Needler ◽  
W. Opechowski
Keyword(s):  
Relaxation Time ◽  
Explicit Expression ◽  
Spin Relaxation ◽  
Nuclear Spin ◽  
Low Temperatures ◽  
Room Temperature ◽  
Hydrogen Gas ◽  
Nuclear Spin Relaxation ◽  
Approximate Theory ◽  
Nuclear Spins

The Schwinger formula for the relaxation time T1 of nuclear spins in hydrogen gas is valid only for sufficiently low temperatures. In this paper an approximate theory of T1 is developed valid for any temperature. An explicit expression is given for T1 valid for temperatures up to room temperature; this expression reduces to the Schwinger formula for sufficiently low temperatures.

Nuclear-spin relaxation in the presence of Mansfield–Ware-4 multipulse sequence

1986 ◽  
Vol 64 (6) ◽  
pp. 733-735 ◽  
Author(s):  
J. S. Blicharski
Keyword(s):  
Relaxation Time ◽  
Spin Relaxation ◽  
Nuclear Spin ◽  
Nuclear Spin Relaxation ◽  
Nuclear Spins

The effective relaxation time T2e is calculated in the weak-collision case, for identical nuclear spins in the presence of a Mansfield–Ware-4 multipulse sequence. The dipole–dipole, quadrupole, and spin-rotational interactions are taken into account.

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