Single-molecule probing of incommensurate biphenyl

• Published in: Физика низких температур
• Date: 2010
• Main Authors: Pärs, M., Palm, V., Kikas, J.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2010
• Subjects: Nanostructures and Impurity Centers in Cryogenic Environment
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/117045
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: 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.

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.