Nanosecond spectral diffusion and optical dephasing in organic glasses over a wide temperature range: incoherent photon echo study of resorufin in D- and D6-ethanol

Tunneling Systems in Amorphous and Crystalline Solids

“…r(t, T) describes the hole broadening by spectral diffusion. It is now experimentally proven that spectral diffusion plays a significant role even on time scales as short as nanoseconds (Bai and Fayer (1988a), Fayer (1988b), Narasimhanet al (1991), Gruzdev and Vainer (1993» and that the dynamics extends at least up to weeks , In the framework of the standard tunneling model the thermodynamical nonequilibrium nature of the glassy state is not considered. But a clear understanding of the decisive role of spectral diffusion for line broadening in organic systems already on short time scales was achieved via comparing holeburning linewidths measured in the range of seconds with photon-echo data acquired in the nanosecond range (Molenkamp and Wiersma (1985), Walsh et al (1986), Berg et al (1987a), Walsh et al (1987), Berg et al (1987b)).…”

Ultrafast optical dephasing in experiments on femtosecond and incoherent photon echo: numerical modeling

“…However, some differences can be observed, for example the influence of the processes occurring over nanosecond exciting laser pulses, which can contribute to the signal of the incoherent photon echo. So in [25], by comparing the data for picosecond and incoherent photon echo techniques, the nanosecond spectral diffusion was obtained.…”

Solvent dynamics in a glass-forming liquid from 300K to 3K: What photon echoes can teach us

“…Optical dephasing of zinc-octaethylporphine in several glass-forming liquids at temperature from 0.35 K to a maximum of 100 K was investigated by Vainer and Gruzdev [43][44][45][46][47][48] using narrowband two-pulse and incoherent photon echoes. They were able to distinguish between a low temperature range, where dephasing mechanisms related to tunneling of the system to nearby almost degenerate minima in the energy landscape were dominant, and a higher temperature range where the dephasing was best described by the coupling of the chromophore to one or two low-frequency vibrational bath modes.…”