Library

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
  • 1
    Electronic Resource
    Electronic Resource
    Poly[(ι-hydroxyalkyl)thio-α-cyanocinnamates]. Linear polyesters with NLO-phores in the main chain (1991)
    s.l. : American Chemical Society
    Macromolecules 24 (1991), S. 1710-1713 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00008a002
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Stark broadening diagnostics of the electron density in the laser ablation plume of YBa2Cu3O7−x and PbZrxTi1−xO3 (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 8088-8096 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Diagnostics of pulsed laser ablation and deposition of superconductive YBCO (YBa2Cu3O7−x) and ferroelectric PZT (PbZrxTi1−xO3) thin films has been accomplished by measuring the Stark broadening of the laser produced plume. Fluorescence emission has been collected from regions along the axis of the plume at different distances from the target surface. The line shape of some selected transitions has been analyzed and the electron density ne determined from the observed linewidth. The measured values of ne are in the range 0.4–30×1017 cm−3 for YBCO and 0.1–6×1017 cm−3 for PZT. A scaling law of ne as a function of the distance from the target has been found, which indicates a one-dimensional behavior in the early stage of the electron cloud expansion. The dependence of ne on the presence of the ambient oxygen gas and on the laser fluence has been also investigated. The results of the diagnostics are compared with theoretical predictions and correlated with the deposition parameters. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357857
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Improved optical emission of porous silicon with different postanodization processes (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 1084-1086 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time integrated and time resolved photoluminescence measurements have been performed at room temperature on porous silicon samples prepared under identical conditions but processed after anodization in four different ways. New and simple treatments were made to reduce the structural damage due to the drying process. The results show that suitable conditions exist to substantially improve the optical emission of porous silicon samples. The observed modifications of the time integrated photoluminescence signal are related to dangling bonds produced during the drying process that are supposed to act as trap states in the electron–hole or excitons recombination mechanism. Time resolved measurements provide an evaluation of the relative density of trap states for each analyzed sample. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114457
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Norbornanes. Part 18. Inductive Charge Dispersal in the Solvolyses of 4- and 5-Substituted 2-Norbornyl p-Toluenesulfonates (1986)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 69 (1986), S. 2098-2107 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The solvolysis rates and products of 4- and 5-exo-substituted 2-exo- and 2-endo-norbornyl tosylates 9 and 10, respectively, are reported. The logarithms of the rate constants (log k) correlate linearly with the inductive constants σIq for the substituents. A comparison of the reaction constants p1 for the 4-, 5-, 6-, and 7-substituted 2-exo- and 2-endo-tosylates 9, 10, 1, and 2 respectively, indicates that inductivity is higher for 2-exo-ionization than for 2-endo-ionization in all series. This observation is attributed to the more favorable alignment of neighbouring C-atoms for dorsal participation in exo-ionization, especially, in the case of C(6).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19860690834
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Norbornanes. Part 20. Inductivity and bridging in 2-norbornyl cations (1988)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 71 (1988), S. 312-319 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The solvolysis rates and products of several 1-substituted 2exo- and 2-endo-norbornyl p-toluenesulfonates 7 and 8, respectively, have been determined. Hydrolyses of these epimeric tosylates yielded rearranged products in varying amounts, except when the substituent was COOCH3 or CN. The logarithms of the rate constants (log k) for the endo-series 8 correlated linearly with the corresponding inductive constants σ1q with a reaction constant ρI of -1.24. On the other hand, log k values for the exo-series 7 appear to fit two regression lines, the first line (ρI = -1.90) defined by the tosylates that ionize, with rearrangement, to the tertiary cations 11, the second (ρI = -1.86) by the tosylates 7 (R = H, COOCH3, and CN) that ionize to an asymmetrically bridged secondary cation 19. These results confirm the unique participation of C(6) with a ρI of -2.00 in the ionization of 2-exo-nor-bornyl tosylate.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19880710203
    Library Location Call Number Volume/Issue/Year 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...