ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 64.70 Dv  (1)
  • 78.50Ge  (1)
  • 1990-1994  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Jahn-Teller interaction at Cr2+(d 4) centres in tetrahedrally coordinated II–VI lattices studied by optical spectroscopy (1993)
    Springer
    The European physical journal 91 (1993), S. 429-436 
    Details
    ISSN: 1434-6036
    Keywords: 71.70Ej ; 78.50Ge ; 78.55Et
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Optical spectra of thed 4 configuration have been studied with II–VI compounds. Failure of static crystal-field description led various authors to introduce static or dynamic Jahn-Teller models for the Cr2+ ground and excited states. With ZnS, the main optical transition5 E(D)↔5 T 2(D) now appears as a doublet at 5218 and 5212 cm−1 coinciding for emission and absorption spectra. This no-phonon structure indicates a splitting of the gound-and excited-state multiplets under combined Jahn-Teller and spin-orbit interactions. In the cubic host ZnSe and in the hexagonal compounds CdS and CdSe, the optical properties exhibit the same general behaviour but with a decreasing shaping of the structural details. In addition to the NIR measurements, middle-infrared spectra have been recorded by Fourier spectroscopy in the transmission mode. For the first time a broad band could be detected for ZnS and interpreted as the $$^5 \hat E\left( {T_2 } \right) \leftarrow ^5 \hat B\left( {T_2 } \right)$$ absorption between the sheets of the respective adiabatic potential surfaces inD 2d symmetry. Its maximum near 1300 cm−1 indicates $$\bar v_{JT} \approx 430cm^{ - 1} $$ cm−1 following the common interpretation of this transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01316820
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Two distinct transitions in ultrafast solid-liquid phase transformations of GaAs (1991)
    Springer
    Applied physics 53 (1991), S. 227-234 
    Details
    ISSN: 1432-0630
    Keywords: 64.70 Dv ; 71.30+h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Femtosecond-laser-induced changes of the optical reflectivity and the reflected second harmonic are measured over a wide range of times and laser fluences. Changes of the linear and nonlinear optical properties suggestive of a transition to a metallic state have been observed. For relatively low fluences these changes take tens of picoseconds to develop. For higher fluences the transition takes place in just a few hundred femtoseconds. Our data suggest that, depending on the laser excitation conditions, two distinctly different types of phase transformations are observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324257
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...