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  • 78.50  (2)
  • Butanols  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Thermodynamic functions for the systems 1-butanol, 2-butanol, andt-butanol + cyclohexane (1983)
    Springer
    Journal of solution chemistry 12 (1983), S. 869-887 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Butanols ; 1-butanol ; 2-butanol ; t-butanol ; cyclohexane ; solutions ; excess enthalpy ; excess volume
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The following properties of mixtures of the butanols with cyclohexane were measured over the whole range of composition: 1-butanol+cyclohexane and 2-butanol+cyclohexane; excess enthalpies at 15, 25, 35 and 45°C, excess volumes at 25 and 45°C, activity coefficients and excess Gibbs free energies at 45°C. 2-Methylpropan-2-ol (tertiary butanol)+cyclohexane; excess enthalpies at 26, 35, and 45°C, excess volumes at 26 and 45°C, activity coefficients and excess Gibbs free energies at 45°C. From these data, activity coefficients at the temperatures of the excess enthalpy measurements below 45°C have been computed, as a source of test data for models of alcohol association through hydrogen bonding.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00643927
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Luminescence from Ti2+ ions in LiF crystals (1991)
    Springer
    Applied physics 53 (1991), S. 214-217 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 42.70 ; 78.50 ; 78.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Luminescence of Ti2+: LiF crystals in the wavelength range 650–900 nm excited using laser radiation is reported. The values of 10Dq and the Racah B parameter obtained from the present results indicate that in LiF the 1 E, 1 T 2, and 3 T 2 energy levels are almost at the “cross-over” point in the Tanabe-Sugano diagram. In consequence photoluminescence from all three energy levels to the ground state is observed. At low temperature (T ∼ 14 K) the emission is mainly due to sharp emission lines with weak vibronic structure due to the 1 E, 1 T 2→3 T 1 transitions of Ti2+ ions. The 3 T 2→3 T 1 broad-band emission is weak at low temperature, becoming stronger at 300 K due to a phonon-assisted tunnelling process, similar to that observed in Cr3+: garnets [1]. The excitation spectrum of these lines is a broad peak at 590 nm due to absorption in the 3 T 1→3 T 2 transition.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00324254
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  • 3
    Digitale Medien
    Digitale Medien
    Optical spectroscopy of Cr3+ ions in LiF single crystals (1991)
    Springer
    Applied physics 53 (1991), S. 209-213 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 42.70 ; 78.50 ; 78.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract This paper reports on the luminescence spectrum, its excitation-wavelength dependence and decaytime of Cr3+:LiF crystals. In contrast to Al2O3 and MgO, where the Cr3+ luminescence at low temperature is due to the R-line and its vibronic sideband, luminescence from Cr3+:LiF is assigned to the broad-band 4 T 2→4 A 2 transition. A periodic structure in the vibronic sidebands of this transition occurs with energy separations of ca. 60 meV. The linear polarisation of the vibronic sidebands shows that their radiative transition takes place from the lowest excited level of the 4 T 2 state, i.e. 4 B 1, into the 4 A 2 ground state of Cr3+ ions in orthorhombic symmetry sites. The crystal-field parameters calculated from the experimental data, and luminescence decay-time of the two polarized configurations of the 4 B 1(4 T 2)→4 A 2 transition are also reported.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00324253
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