Abstract
The purely electronic linewidth delta of terrylene impurity molecules in monocrystalline biphenyl is studied at temperatures T between 1.7 and 3.5 K using the technique of single-molecule spectroscopy (SMS). Based on the data obtained, individual molecules appear to have their own law of delta(T) dependence; further, hysteresis effects have been observed in thermocycling experiments. The single-molecule (SM) lines investigated quickly broaden and vanish at temperatures between 3 and 3.5 K and reappear after the sample is cooled down again. At T approximate to 2 K, a slow process of spectral diffusion (SD) was observed on timescales longer than 10s. To learn about the role of faster SD processes, the technique of intensity time-frequency correlation (ITFC) SMS was applied to a stable SM line after it had been broadened by 75% as a result of a thermocycling experiment. At 2 and 2.3 K, no significant line broadening could be revealed on timescales between 0.16 ms and 10s. (C) 2007 Elsevier B.V. All rights reserved.
Original language | English |
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Pages (from-to) | 218-223 |
Journal | Journal of Luminescence |
Volume | 127 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2007 |
Subject classification (UKÄ)
- Atom and Molecular Physics and Optics
Free keywords
- hysteresis
- linewidth temperature
- dependence
- time-resolved single-molecule spectroscopy
- terrylene
- incommensurate biphenyl