LEVEL-CROSSING RELAXATION STUDY OF ND4+ ION TUNNELLING FREQUENCIES IN ND4CLO4 AND (ND4)2PTCL6

被引：15

作者：

LALOWICZ, ZT ^{[1
]}

PUNKKINEN, M ^{[1
]}

YLINEN, EE ^{[1
]}

机构：

[1] UNIV TURKU,WIHURI PHYS LAB,SF-20500 TURKU 50,FINLAND

来源：

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS | 1979年 / 12卷 / 19期

关键词：

D O I：

10.1088/0022-3719/12/19/023

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Deuteron spin-lattice relaxation time T1 was measured in ND 4ClO4 and (ND4)2PtCl6 at frequencies from 4 to 7 MHz and for the temperature range from 1.7 to 40K. Shallow level-crossing minima were revealed in the frequency dependence, allowing the tunnelling splittings between the A and E symmetry levels to be estimated as about 6.2 MHz and 10.8 MHz for ND4ClO4 and (ND4)2PtCl6, respectively. The shape of the free induction decay was observed to depend on the resonance frequency and was found to be much shorter at the level-crossing minima for ND4ClO 4. Activation energies of 3.2 and 3.6 kJ mol-1 were obtained for ND4ClO4 and (ND4) 2PtCl6 respectively.

引用

页码：4051 / 4060

页数：10

共 23 条

[1] NUCLEAR-SPIN LATTICE-RELAXATION AND ACTIVATION-ENERGIES OF TUNNELLING METHYL-GROUPS [J].

BECKMANN, PA ;

CLOUGH, S .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1977, 10 (09) :L231-L236

[2] DEUTERON NMR LINESHAPE COMPUTATIONS FOR TUNNELLING ND4+ IONS .1. 1ST-ORDER QUADRUPOLAR INTERACTIONS [J].

BLICHARSKI, JS ;

LALOWICZ, ZT ;

SOBOL, W .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1978, 11 (20) :4187-4200

[3] NMR RELAXATION STUDY OF ROTATIONAL MOTION IN LOW-BARRIER AMMONIUM-SALTS [J].

BONORI, M ;

TERENZI, M .

CHEMICAL PHYSICS LETTERS, 1974, 27 (02) :281-284

[4] CONVERSION OF SPIN SPECIES IN SOLID CH4 THROUGH LEVEL CROSSING WITH PARAMAGNETIC IMPURITIES [J].

GLATTLI, H ;

EISENKREMER, M ;

SENTZ, A .

PHYSICAL REVIEW LETTERS, 1972, 28 (14) :871-+

[5] PROTON SPIN-LATTICE RELAXATION AND EXCHANGE SPLITTING OF TORSIONAL GROUND-STATE IN NH4 CLO4 [J].

GUTTLER, W ;

SCHUTZ, JUV .

CHEMICAL PHYSICS LETTERS, 1973, 20 (01) :133-137

[6] PROTON SPIN RELAXATION AND PHONONS IN AMMONIUM-SALTS [J].

HENNEL, JW ;

LALOWICZ, ZT .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1978, 11 (16) :L707-L711

[7] ROTATIONAL TUNNELING IN SOLIDS - THEORY OF NEUTRON-SCATTERING [J].

HULLER, A .

PHYSICAL REVIEW B, 1977, 16 (05) :1844-1857

[8] PROTON MAGNETIC-RESONANCE STUDIES OF QUANTUM-MECHANICAL TUNNELLING OF AMMONIUM IONS IN SEVERAL AMMONIUM SALTS [J].

IKEDA, R ;

MCDOWELL, CA .

MOLECULAR PHYSICS, 1973, 25 (05) :1217-1229

[9] PMR SPECTROSCOPY OF THE TUNNELING AMMONIUM ION - GENERALIZED LINE-SHAPE THEORY AND SOME EXPERIMENTAL EXAMPLES [J].

LALOWICZ, ZT ;

MCDOWELL, CA ;

RAGHUNATHAN, P .

JOURNAL OF CHEMICAL PHYSICS, 1979, 70 (11) :4819-4829

[10] ANALYSIS OF NMR LINE-SHAPES OF AMMONIUM ION UNDERGOING COMPOSITE TUNNELING AND REORIENTATIONAL MOTIONS AT LOW-TEMPERATURES [J].

LALOWICZ, ZT ;

MCDOWELL, CA ;

RAGHUNATHAN, P .

JOURNAL OF CHEMICAL PHYSICS, 1978, 68 (03) :852-863

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