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  • 1
    Electronic Resource
    Electronic Resource
    Conformational mimicry. 3. Synthesis and incorporation of 1,5-disubstituted tetrazole dipeptide analogs into peptides with preservation of chiral integrity: bradykinin (1992)
    s.l. : American Chemical Society
    The @journal of organic chemistry 57 (1992), S. 202-209 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00027a038
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  • 2
    Electronic Resource
    Electronic Resource
    Photodissociation spectroscopy of gas-phase 2-methyl-1-penten-3-yne radical cation (1990)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 94 (1990), S. 2324-2327 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100369a025
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  • 3
    Electronic Resource
    Electronic Resource
    Kinetic parameters for the unimolecular dissociation of styrene ion (1990)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 94 (1990), S. 3283-3286 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100371a013
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  • 4
    Electronic Resource
    Electronic Resource
    Time-dependent mass spectra and breakdown graphs. 14. Iodotoluene isomers (1991)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 1667-1671 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100157a032
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of multilayer structure and laser pulse width on the reversible cycling of phase change optical storage media (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 3680-3687 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The static cycling behavior of chalcogenide phase change optical recording media was investigated. Thin-film multilayer structure and laser pulse conditions were both varied to determine optimum conditions for good cycling behavior. For all structures, cyclability was always best for short pulses. An aluminum overcoat layer was found to substantially increase the performance. The effect of the temperature excursion experienced during writing on cycling was determined. At the shortest pulses it was demonstrated that the thermal excursions did not depend upon the presence of an aluminum overcoat, suggesting that mechanical strength was important for enhancing cyclability. For longer pulses the aluminum changed the thermal characteristics of the stack. These differences between various samples are compared to try to elucidate modes of failure in optical data storage structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350877
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of the lithium Frenkel energy in lithium tantalate (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 2485-2488 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ferroelectric to paraelectric phase transition is modeled as an order-disorder process with lithium atoms jumping between their normal sites and adjacent interstitial sites. This lithium jump corresponds to lithium Frenkel defect formation. At temperatures significantly away from the Curie temperature it is found that the lithium Frenkel energy is about 0.165 eV. As the temperature approaches Tc, disorder abounds and eventually the lithiums become equally distributed between the two available sites. The previously reported spontaneous polarization, Ps, data for lithium tantalate are analyzed in terms of this order-disorder model. The slope of P2s with temperature is directly in line with the model's prediction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348686
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  • 7
    Electronic Resource
    Electronic Resource
    Infrared multiphoton dissociation of styrene ions by low-power continuous CO2 laser irradiation (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 5069-5075 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The kinetics of infrared multiphoton dissociation of styrene ions under collision-free conditions in the ion cyclotron resonance ion trap were studied as a function of the intensity of the cw CO2 laser at powers up to 6 W. Following the beginning of irradiation an induction time was observed, followed by dissociation according to a first-order rate constant. The kinetics could be fitted to a random-walk simulation of a master-equation model, in the same way as previous studies. A matrix-algebra solution of the master-equation model is described which gave a better fit with greater computational convenience. From the modeling the rate of radiation of infrared photons (assumed to be at 940 cm−1) from the ions was estimated as 350 s−1 at an ion internal energy of around 3 eV. When the dissociation threshold Et was treated as an unknown it was found that master-equation modeling of the kinetic results could give an estimate of Et, but with large uncertainty. Application of simple thermal kinetic theory via Tolman's theorem gave good qualitative understanding of the results, and predicted the intensity dependence of the dissociation rate with a deviation of about 30%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462860
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  • 8
    Electronic Resource
    Electronic Resource
    The kinetics of infrared laser photodissociation of n-butylbenzene ions at low pressure (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 8897-8905 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Molecular ions of n-butylbenzene trapped in the ion cyclotron resonance ion trap were dissociated by cw CO2 -laser irradiation at pressures near 1×10−8 Torr where collisions play a negligible role in the kinetics. The dissociation as a function of time after laser onset showed a well-defined induction time τind, followed by exponential decay of a parent ion with first-order rate constant kdiss. Data were collected over a range of laser intensities giving kdiss values from 0.3 to 10.5 s−1. Computer simulation of the dissociation curves was carried out using a random-walk method to solve a master equation for the kinetics, and assuming infrared radiative relaxation as the mechanism of ion deactivation. The simulations yielded curves also showing well-defined induction times and dissociation rate constants. It was necessary to consider both the induction times and the dissociation rates to constrain the fit of experiment and computer simulation. The resulting fit was good. The thermal picture of low-pressure infrared multiphoton dissociation kinetics developed in previous work was applied to the data, and thermal kinetics were found to give an excellent description of the observed kinetics. The observed activation energies were successfully interpreted in terms of the modified Tolman's theorem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462247
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  • 9
    Electronic Resource
    Electronic Resource
    Slow time-resolved photodissociation of p-iodotoluene ion (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 3542-3547 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using time-resolved photodissociation in the ion cyclotron resonance mass spectrometer, the dissociation of p-iodotoluene ion was time resolved at five wavelengths between 532 and 630 nm. This is the slowest dissociation which has been time resolved for ions of well defined internal energies, giving inverse time constants for fragment ion appearance ranging from 2×102 to 1.1×103 s−1. At the longer wavelengths, dissociation is in clear competition with infrared-radiative relaxation of the photoexcited ion, which is calculated by kinetic modeling of the observed curves to give an energy loss rate of 6.2 eV s−1 (50 000 cm−1 s−1). The dissociation kinetics of this ion are in complete accord with a Rice–Ramsberger–Kassel–Marcus (RRKM) model with E0 of 1.9 eV and ΔS1000 K of −4 eu. It is concluded from the high activation energy that the rate limiting step in the dissociation kinetics is a molecular rearrangement preceding dissociation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459776
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  • 10
    Electronic Resource
    Electronic Resource
    Radiative relaxation rate determination by competitive photodissociation of n-butylbenzene ions (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 1626-1631 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The radiative relaxation rate of n-butylbenzene ions was measured using competitive photodissociation as a thermometric tool. Cooling curves showing the loss of internal energy of the ions with time were obtained at three pressures. An infrared radiative cooling rate of 0.5 s−1 was obtained from the data. This value is comparable to other cooling studies done in polyatomic ions having internal temperatures of the order of 200 K above room temperature. The radiative cooling of polyatomic molecules is compared with that of diatomics. Observations are in accord with theoretical expectations in showing that for polyatomics the infrared radiative cooling rate constants are slow and strongly dependent on internal temperature, in contrast to diatomics where they are fast and temperature independent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459090
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