On the radiative linewidth in single molecule spectroscopy

Inna Rebane

Taras Plakhotnik

E. del Barco, Andrew D. Kent, En‐Che Yang +1 more

Quantum tunneling of the magnetization in a single molecule magnet has been studied in experiments that combine microwave spectroscopy with high sensitivity magnetic measurements. By monitoring spin-state populations in the presence of microwave radiation, the energy splittings between low lying superpositions of high-spin states of single molecule magnet Ni4 (S=4) have been measured. Absorption linewidths give an upper bound on the rate of decoherence. Pulsed microwave experiments provide a measure of energy relaxation time, which is found to increase with frequency.

Hermann Bach, Thomas Irngartinger, Alois Renn +1 more

Spectral hole-burning in the Shpol'skii system terrylene in n-octane has been investigated on the single molecule level. Fluorescence microscopy provides a link between the two methods of spectral hole-burning and single molecule spectroscopy. Information about many different individual molecules can be obtained simultaneously under identical experimental conditions allowing the determination of statistical properties. From a single frequency scan after spectral hole-burning, the ground state population function and an average hole-width, as well as the single molecule linewidth distribution of 700 molecules have been determined.

V. Palm, K. -S. K. Rebane

Yu. G. Vainer, Roman I. Personov, Stephan J. Zilker +1 more

Experimental data on Photon Echoes (PE) in the system terrylene/poly(isobutylene) in the temperature range 0.4–8K are presented and compared with Single Molecule Spectroscopy (SMS) results. From this comparison we conclude that the linewidth distribution in SMS is caused mainly by a large T 2-dispersion (but not slow spectral diffusion). The temperature line broadening is discussed.