Accession Number:

AD0293441

Title:

NUCLEAR RELAXATION OF N-14 BY QUADRUPOLE INTERACTIONS IN MOLECULAR LIQUIDS

Descriptive Note:

Corporate Author:

ILLINOIS UNIV URBANA NOYES CHEMICAL LAB

Personal Author(s):

Report Date:

1962-09-07

Pagination or Media Count:

1.0

Abstract:

RF pulse methods were used to measure the N-14 spin-lattice relaxation time in 25 molecular liquids, with the N-14 in several types of group. For eight of the compounds, microwave or pure quadrupole resonance measurements of the N-14 quadrupole coupling constant were combined with our T1 results to give values for the correlation time Tq describing the molecular reorientations which govern T1. These values for Tq at 25 C are about an order of agnitude shorter than reorientational correlation times calculated from the viscosity and molecular radius using the Debye-BPP approach. For the other compounds, Tq was estimated and used with the observed T1 for N-14 to predict values of the quadrupole coupling constant. The temperature dependence of T1 was observed for nine compounds, leading to activation energies for molecular reorientation of 1.4 to 3.2 kcalmole and inverse frequency factors Tq of 2 to 9 times 10 to the -14th power sec. The temperature dependence of the proton T1 was observed in CH3CN and it is compared with that of N-14. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE