研究目的
Investigating the temperature-dependent spin-flip transitions in absorption spectra of Cr3+-doped silicate glasses.
研究成果
The Neuhauser model is reliable for analyzing temperature effects in absorption bands with interference dips, providing precise transition energies for spin-forbidden bands overlapping spin-allowed transitions. The study demonstrates the utility of optical absorption spectroscopy in determining the coefficient of thermal expansion of Cr3+ sites in glasses and doped crystals.
研究不足
The model treats the spin-allowed transition band as a Lorentzian, which may not fully capture the asymmetric vibronic 'wings' of the bands. The study is limited to Cr3+-doped silicate glasses, and the applicability of the findings to other systems may vary.
1：Experimental Design and Method Selection:
The study involved recording temperature-dependent optical absorption spectra of Cr3+-doped silicate glasses. An analytical model derived by Neuhauser was used to fit the spectra and extract electronic structure parameters.
2：Sample Selection and Data Sources:
Three Cr3+-doped silicate glasses, NS3, CS, and SBN, were used. Their compositions are detailed in the paper.
3：List of Experimental Equipment and Materials:
A double-beam Varian Cary 5G spectrometer and an Oxford liquid helium cryostat were used for low-temperature spectra. High-temperature transmission spectra were recorded at the Paris Institute of Nanosciences.
4：Experimental Procedures and Operational Workflow:
Absorption spectra were recorded at various temperatures from 10 K to 773 K. The fitting was restricted to a region close to the 4T2, 2E, and 2T1 band centres.
5：Data Analysis Methods:
The Neuhauser model was fitted to the spectra using a least-squares routine to obtain parameters including transition energies and coupling constants.
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