The fluorescence line narrowing (FLN) of the N 1 and N 2 lines of pairs of Cr 3+ ions in concentrated ruby has been studied. The structure of the narrowed lines has been explained and measurements of the homogeneous width have been improved. By use of the FLN and time-resolved spectroscopy, spectral transfer within the N 1 line has been investigated. A two-phonon-assisted process has been found to be responsible for the transfer.

Journal of Physics C Solid State PhysicsOct 20, 19843 citations

Coupling single particle states to phonons in a microscopical framework

C. Barbieri

Bulletin of the American Physical SocietyMay 14, 20050 citations

Journal of Luminescence

Fluorescence dynamics in 1D systems with phonon-assisted energy transfer

Ibrahim Avgin, David L. Huber

Published Nov 1, 1999• 2 citations

Publisher

DOI: 10.1016/s0022-2313(99)00097-6

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The fluorescence intensities and lifetimes of various no-phonon lines in ruby samples with 2.1 and 0.94% ${\mathrm{Cr}}^{3+}$ were studied from 13 to 700\ifmmode^\circ\else\textdegree\fi{}K. The temperature dependences of the intensities of numerous lines were used to determine the energy levels of two pair systems. The relative intensities of the single-ion ( $R$ ) lines and the pair ( $N$ ) lines are proportional to Boltzmann factors ${e}^{\frac{\ensuremath{-}\ensuremath{\Delta}E}{\mathrm{kT}}}$, where $\ensuremath{\Delta}E$ is the difference in energy of the metastable states, at high temperatures but not at low temperatures. The deviation from this law is greater and occurs at higher temperatures in the less concentrated sample. The fluorescence decays of the $R$ and $N$ lines are pure exponentials in the temperature region where the $N$ lines follow a Boltzmann law; at low temperatures the $N$ lines have an initial rise in fluorescence and then a decay. These results are interpreted in terms of coupled fluorescence systems consisting of single ions and pairs. A phonon-assisted cross-relaxation coupling process is suggested which allows for thermalization of the systems at high temperatures and direct pumping of the pair systems by the single-ion system at low temperatures. Energy transfer from single-ion to multi-ion systems was also observed.The fluorescence intensities and lifetimes of various no-phonon lines in ruby samples with 2.1 and 0.94% ${\mathrm{Cr}}^{3+}$ were studied from 13 to 700\ifmmode^\circ\else\textdegree\fi{}K. The temperature dependences of the intensities of numerous lines were used to determine the energy levels of two pair systems. The relative intensities of the single-ion ($R$) lines and the pair ($N$) lines are proportional to Boltzmann factors ${e}^{\frac{\ensuremath{-}\ensuremath{\Delta}E}{\mathrm{kT}}}$, where $\ensuremath{\Delta}E$ is the difference in energy of the metastable states, at high temperatures but not at low temperatures. The deviation from this law is greater and occurs at higher temperatures in the less concentrated sample. The fluorescence decays of the $R$ and $N$ lines are pure exponentials in the temperature region where the $N$ lines follow a Boltzmann law; at low temperatures the $N$ lines have an initial rise in fluorescence and then a decay. These results are interpreted in terms of coupled fluorescence systems consisting of single ions and pairs. A phonon-assisted cross-relaxation coupling process is suggested which allows for thermalization of the systems at high temperatures and direct pumping of the pair systems by the single-ion system at low temperatures. Energy transfer from single-ion to multi-ion systems was also observed.

Physical ReviewMar 10, 196764 citations

Fluorescence line narrowing and spectral energy transfer in pair lines of ruby

André Monteil, Eugène Duval

Journal of Physics C Solid State PhysicsOct 20, 19843 citations

Coupling single particle states to phonons in a microscopical framework

C. Barbieri

Bulletin of the American Physical SocietyMay 14, 20050 citations

The fluorescence intensities and lifetimes of various no-phonon lines in ruby samples with 2.1 and 0.94%

{\mathrm{Cr}}^{3+}

were studied from 13 to 700\ifmmode^\circ\else\textdegree\fi{}K. The temperature dependences of the intensities of numerous lines were used to determine the energy levels of two pair systems. The relative intensities of the single-ion (

R

) lines and the pair (

N

) lines are proportional to Boltzmann factors ${e}^{\frac{\ensuremath{-}\ensuremath{\Delta}E}{\mathrm{kT}}}$, where $\ensuremath{\Delta}E$ is the difference in energy of the metastable states, at high temperatures but not at low temperatures. The deviation from this law is greater and occurs at higher temperatures in the less concentrated sample. The fluorescence decays of the

R

and

N

lines are pure exponentials in the temperature region where the

N

lines follow a Boltzmann law; at low temperatures the

N

lines have an initial rise in fluorescence and then a decay. These results are interpreted in terms of coupled fluorescence systems consisting of single ions and pairs. A phonon-assisted cross-relaxation coupling process is suggested which allows for thermalization of the systems at high temperatures and direct pumping of the pair systems by the single-ion system at low temperatures. Energy transfer from single-ion to multi-ion systems was also observed.