Malyshev, AndreyDomínguez-Adame Acosta, Francisco2023-06-202023-06-201999-11-050009-261410.1016/S0009-2614(99)01025-8https://hdl.handle.net/20.500.14352/59359(C) 1999 Elsevier Science B.V. All rights reserved. The authors thank A. Sánchez for critical reading of the manuscript. This work was supported by CAM under Project 07N/0034/98. V. A. M. thanks UCM for the support under Sabáticos Complutense as well as partial support from the Russian Foundation for Basic Research under Project 97-03-09221.We analyze the peculiarities of the motional narrowing effect in disordered one-dimensional Frenkel chains with off-diagonal disorder, induced by uncorrelated Gaussian fluctuations in the positions of the host units. A clear difference in the scaling laws with respect to the magnitude of the positional disorder and the chain size is found, as compared to those for uncorrelated diagonal disorder as well as for off-diagonal disorder modeled by uncorrelated randomness in the nearest-neighbor couplings. The origin of such a difference is discussed in detail.engjournal articlehttp://dx.doi.org/10.1016/S0009-2614(99)01025-8http://www.sciencedirect.com/http://arxiv.org/abs/cond-mat/9908437open access538.9Física de materiales