TY - JOUR
T1 - Observation of an Orbach process in molecular solids by means of pure nuclear quadrupole resonance measurements
AU - Grinberg, S. P.
AU - Shapira, Yoram
PY - 1985/4
Y1 - 1985/4
N2 - The spin-lattice relaxation time, T1, of 14N in pure nuclear quadrupole resonance (PNQR) has been measured as a function of temperature in aniline, ortho-phenylenediamine (OPD) and deuterated-ortho-phenyl- enediamine (DOPD). The experimentally obtained activation energies, Δ, are remarkably close to the vibrational mode energies of the amine group NH2 (∼3200 cm-1) and ND2 (∼2300 cm-1). A relaxation mechanism is proposed whereby the transition is carried out by an Orbach process involving two high energy (Δ≫kBT) vibrational modes.
AB - The spin-lattice relaxation time, T1, of 14N in pure nuclear quadrupole resonance (PNQR) has been measured as a function of temperature in aniline, ortho-phenylenediamine (OPD) and deuterated-ortho-phenyl- enediamine (DOPD). The experimentally obtained activation energies, Δ, are remarkably close to the vibrational mode energies of the amine group NH2 (∼3200 cm-1) and ND2 (∼2300 cm-1). A relaxation mechanism is proposed whereby the transition is carried out by an Orbach process involving two high energy (Δ≫kBT) vibrational modes.
UR - http://www.scopus.com/inward/record.url?scp=0022043116&partnerID=8YFLogxK
U2 - 10.1016/0038-1098(85)91141-X
DO - 10.1016/0038-1098(85)91141-X
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AN - SCOPUS:0022043116
SN - 0038-1098
VL - 54
SP - 155
EP - 158
JO - Solid State Communications
JF - Solid State Communications
IS - 2
ER -