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T Plakhotnik

Publications and source records attributed to T Plakhotnik.

4 recordsLinked to original sources
PubMed2001

Electronic energy relaxation and transition frequency jumps of single molecules at 30 mK.

Transition frequency jumps for single terrylene molecules in a polyethylene matrix caused by resonant laser irradiation are investigated at 30 mK. These jumps are not accompanied by substantial sample heating. A model for the effect is proposed, based on the interaction of tunneling two-level systems (TLSs) surrounding the single molecule with high-energy nonthermal phonons emitted by the molecule during electronic energy relaxation. The radius of the effective interaction volume is estimated to be r(m) approximately 12.5 nm, and the interaction cross section for nonequilibrium phonon-TLS scattering is estimated as approximately 10(-22) cm2.

Journal Article↗
PubMed2000

Non-lorentzian single-molecule line shape: pseudolocal phonons and coherence transfer

The excitation line shape of a single terrylene molecule in a naphthalene crystal has been investigated. In addition to the conventional Lorentzian, it consists of a dispersive component in the core region and a sideband. This is due to a pseudolocal phonon caused by the substitution of a host molecule with the chromophore. When the pseudolocal phonon is excited, the resonance frequency of the chromophore slightly changes, resulting in the appearance of a second, quasiresonant transition. Coherence transfer between these two optical transitions causes the deviation from the purely Lorentzian line shape.

Journal Article↗