Посилання:Single-molecule probing of incommensurate biphenyl / M. Pärs, V. Palm, J. Kikas // Физика низких температур. — 2010. — Т. 36, № 5. — С. 559-562. — Бібліогр.: 15 назв. — англ.
Підтримка:Authors are grateful to Artur Suisalu for stimulating discussions. Acknowledged is the support from Estonian Science Foundation Grants Nos. 6543, 7141, and 8167.
Our data on the distribution of purely-electronic linewidths of terrylene single molecules in incommensurate biphenyl crystals are compared with the data of other groups for different low-temperature organic solid hosts and with results of numerical simulations. The first two moments of the distributions measured within a narrow temperature interval have been used to calculate a single dimensionless parameter characterizing each of the respective hosts — the variation coefficient. It appears that different amorphous hosts have similar values of this coefficient, but the value obtained for the incommensurate crystal of biphenyl is significantly different. One can conclude that the remarkable single-molecule line broadening in biphenyl at 1.8 K cannot be solely explained by the interaction with two-level systems, which is considered to cause the broadening in amorphous hosts.