CH₃NH₃⁺ as a quantum and classical rotor

ISSN： 0141-1594

Source： Phase Transitions: A Multinational Journal, Vol.76, Iss.9-10, 2003-01, pp. : 867-872

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Abstract

Spin-lattice relaxation time T₁ is determined for protons in three polycrystals (CH₃NH₃)₅Bi₂Cl₁₁, (CD₃NH₃)₅Bi₂Cl₁₁ and (CH₃ND₃)₅Bi₂Cl₁₁. The temperature dependence of the relaxation times obtained for (CH₃NH₃)₅Bi₂Cl₁₁ and (CD₃NH₃)₅Bi₂Cl₁₁ are interpreted as a result of correlated motions of the three-proton groups of the monomethylammonium cation. ²H NMR lines of (CD₃NH₃)₃Sb₂Br₉ have been recorded between 5 K and 291 K using solid echo method. The ²H NMR line shape analysis shows that characteristic shape of tunnelling methyl group appears at about 25 K and coming down with temperature up to 5 K is more distinct. From theoretical calculation, it has been found that in the quadrupolar constants is 161.3 kHz and tunnelling frequency is above 3 MHz.