Persistent infrared spectral hole burning of Tb^3+ in the glasslike mixed crystal Ba_1−x_−yLaxTbyF_2+x_+y

Love, S. P.; Mungan, Carl E.; Sievers, A. J.; Campbell, J. A.

doi:10.1364/josab.9.000794

Cited by 27 publications

(37 citation statements)

References 17 publications

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“…39 It is clear that g(V) obtained from experimental data and sketched in Figure 8B is not Gaussian and resembles the results of refs 10−12, where the g(V) ∼ 1/√V barrier distribution was deduced. A small plateau in the experimental data (diamonds) at the lowest temperatures can be explained by the smallest-barrier systems recovering due to tunneling during the first hour at burn temperature, before thermocycling started.…”

Section: Protein Energysupporting

confidence: 80%

Conformational Changes in Pigment–Protein Complexes at Low Temperatures—Spectral Memory and a Possibility of Cooperative Effects

et al. 2015

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We employed nonphotochemical hole burning (NPHB) and fluorescence line narrowing (FLN) spectroscopies to explore protein energy landscapes and energy transfer processes in dimeric Cytochrome b6f, containing one chlorophyll molecule per protein monomer. The parameters of the energy landscape barrier distributions quantitatively agree with those reported for other pigment-protein complexes involved in photosynthesis. Qualitatively, the distributions of barriers between protein substates involved in the light-induced conformational changes (i.e., -NPHB) are close to glass-like ∼1/√V (V is the barrier height) and not to Gaussian. There is a high degree of correlation between the heights of the barriers in the ground and excited states in individual pigment-protein systems, as well as nearly perfect spectral memory. Both NPHB and hole recovery are due to phonon-assisted tunneling associated with the increase of the energy of a scattered phonon. As the latter is unlikely for simultaneously both the hole burning and the hole recovery, proteins must exhibit a NPHB mechanism involving diffusion of the free volume toward the pigment. Entities involved in the light-induced conformational changes are characterized by md(2) value of about 1.0 × 10(-46) kg·m(2). Thus, these entities are protons or, alternatively, small groups of atoms experiencing sub-Å shifts. However, explaining all spectral hole burning and recovery data simultaneously, employing just one barrier distribution, requires a drastic decrease in the attempt frequency to about 100 MHz. This decrease may occur due to cooperative effects. Evidence is presented for excitation energy transfer between the chlorophyll molecules of the adjacent monomers. The magnitude of the dipole-dipole coupling deduced from the Δ-FLN spectra is in good agreement with the structural data, indicating that the explored protein was intact.

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Section: Protein Energysupporting

confidence: 80%

Conformational Changes in Pigment–Protein Complexes at Low Temperatures—Spectral Memory and a Possibility of Cooperative Effects

et al. 2015

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“…It is known that hole depth is closely related to the quantum efficiency of hole formation. 17,18 Thus, the efficiency of hole formation appears to be saturated beyond a certain condition ͑BNEC05͒. On the other hand, hole width increased further in the BNEC10 glass while maintaining the depth.…”

Section: Resultsmentioning

confidence: 97%

“…When we consider a two-level system which consists of burnt and unburnt states separated by a barrier with height V, hole relaxation can be described as a reaction between two states by either tunneling through or overcoming the barrier. 18,[35][36][37] The rate at which a burnt hole relaxes to an unburnt state is given by 18…”

Section: B Relaxation and Stability Of The Burnt Holementioning

confidence: 99%

“…When is assumed to have a Gaussian distribution 18,35,36 with a center value of 0 and width of , the distribution function g() can be expressed as…”

Section: B Relaxation and Stability Of The Burnt Holementioning

confidence: 99%

“…The total number of centers ͓N(t)͔ which remain in the burnt configuration after time t can be described as 18,35,36 N͑t…”

Section: ͑2͒mentioning

confidence: 99%

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Mechanism of the room-temperature persistent spectral hole burning in borate glasses doped with Eu3+

Chung

Heo

2002

Journal of Applied Physics

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Spectroscopic properties and room-temperature persistent spectral hole burning mechanisms of Eu3+-doped borate glasses were investigated. The depth of the burnt hole increased with the amount of carbon powders (i.e., degree of reducing atmosphere). This was attributed to the formation of defects which can donate free electrons for the photoreduction of Eu3+→Eu2+. Holes survived >104 s at 20 K and approximately 40% of hole areas were preserved after annealing at 280 K. The photoreduction of Eu3+ to Eu2+ is a primary mechanism of hole burning and this hypothesis was supported by spectral hole properties, relaxation properties as well as changes in the local structure of Eu3+ in glasses.

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Line Broadening Mechanisms and Their Measurement

Meltzer¹

2005

Spectroscopic Properties of Rare Earths in Optical Materials

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Persistent infrared spectral hole burning of Tb^3+ in the glasslike mixed crystal Ba_1−x_−yLaxTbyF_2+x_+y

Cited by 27 publications

References 17 publications

Conformational Changes in Pigment–Protein Complexes at Low Temperatures—Spectral Memory and a Possibility of Cooperative Effects

Conformational Changes in Pigment–Protein Complexes at Low Temperatures—Spectral Memory and a Possibility of Cooperative Effects

Mechanism of the room-temperature persistent spectral hole burning in borate glasses doped with Eu3+

Line Broadening Mechanisms and Their Measurement

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