Efficient persistent spectral hole-burning of free-base octaethylporphine adsorbed on γ-alumina between 1.6 and 90 K
✍ Scribed by B. Sauter; C. Bräuchle
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 566 KB
- Volume
- 192
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
We have used persistent spectral hole-burning to investigate free-base octaethylporphine (OEP) physisorbed on y-alumina. This system combines the efficient photochemical hole-burning mechanism of free-base porphines with the idea of decoupling the chromophores from the surrounding by using surface attached chromophores. Hole formation of this system is very efftcient and very deep holes ( > 70% depth) can easily be burnt. The system shows high thermal hole stability. A hole with a hole depth of 17% can be burnt at 90 K and holes burnt at 2.5 K recover after being held at 120 K for 30 min. The temperature dependence of the Debye-Wailer factor is very weak. Depending on the excitation wavelength various photoproducts can be generated. The holeburning mechanism is discussed.