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  • 1985-1989  (11)
  • 1
    Electronic Resource
    Electronic Resource
    Chemical chaos: from hints to confirmation (1987)
    s.l. : American Chemical Society
    Accounts of chemical research 20 (1987), S. 436-442 
    Details
    ISSN: 1520-4898
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ar00144a002
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  • 2
    Electronic Resource
    Electronic Resource
    Photoionization of potassium clusters: Neutral and ionic cluster stabilities (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 229-238 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Neutral potassium clusters of two different mass distributions generated either by a sonic or a conical nozzle were photoionized at several ionizing energies. By combining different nucleation conditions with several photoionization situations, variations of ion mass spectral patterns reflecting either neutral or ionic stabilities were obtained. The spectra show peaks or steps for those neutral and ionized clusters which contain 8, 20, and 40 electrons. These can be understood in terms of electronic shell structure for both neutral and ionized potassium clusters. However local irregularities appearing for the small cluster sizes reveal the influence of their geometrical structure. Moreover ionizing laser power dependencies taken at various photon energies were used to study fragmentation effects following ionization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453621
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  • 3
    Electronic Resource
    Electronic Resource
    Adiabatic decomposition of mass-selected alkali clusters (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 5694-5699 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The decomposition of metastable photoionized mass-selected alkali clusters is investigated using a tandem time-of-flight spectrometer. Na+n and K+n are found to decompose mainly by the evaporation of either a single neutral atom or a neutral dimer in a time scale of about 10 μs. The predominant fragmentation channels are found to follow the adiabatic dissociation channels associated with the lowest energies accordingly to our CI calculations. In the light of our experimental and theoretical results a comparison between the different calculations of the absolute atomization energies available in the literature is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453544
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  • 4
    Electronic Resource
    Electronic Resource
    From quasiperiodicity to chaos in the Belousov–Zhabotinskii reaction. II. Modeling and theory (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 3339-3356 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We discuss the quasiperiodic behavior experimentally observed in the Belousov–Zhabotinskii reaction as the result of the interaction of two elementary instabilities, namely the Hopf bifurcation at the origin of the oscillating nature of this reaction and the hysteresis bifurcation which accounts for the phenomenom of bistability. We use a normal form approach to understand the evolution of the dynamics when the BZ system is moved away from the local situation where both these instabilities are competing. We first discuss the transition to chaos which comes with the breaking up of the underlying torus into a fractal object. Then we emphasize that nonlocally such a two-frequency dynamics manifests through alternating periodic–chaotic sequences which look very much like the sequences observed in bench experiments. We propose a seven-variable Oregonator type model which not only accounts for these sequences but also for those which involve only one fundamental frequency as observed in the 1980 Texas experiment. We refer to the dynamical system theory to definitively establish the existence of deterministic chaos in both of these sequences. We conclude with the very promising perspective of using a normal form approach to reduce the evolution equations to their simplest form by selecting the relevant instabilities which control the dynamics of the BZ reaction in the regions of parameter space explored so far.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451992
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  • 5
    Electronic Resource
    Electronic Resource
    From quasiperiodicity to chaos in the Belousov–Zhabotinskii reaction. I. Experiment (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 3325-3338 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report on the experimental observation of both a primary and a secondary Hopf bifurcation leading to quasiperiodicity in the Belousov–Zhabotinskii reaction. When taking the BZ system away from these local conditions, we witness the occurrence of chaos which comes with the breaking of the underlying torus into a fractal object. We emphasize that most of the alternating periodic–chaotic sequences studied in the literature are reminiscent of such two-frequency dynamics. We argue about the controversal existence of deterministic chaos in such sequences. We anticipate the results of a numerical and theoretical investigation of these sequences which discards definitely any stochastic objection to chemical chaos.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452751
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  • 6
    Electronic Resource
    Electronic Resource
    Photodissociation of size-selected K+n clusters (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 3022-3027 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photofragmentation studies are described for size-selected ionized potassium-atom clusters, generated in a supersonic expansion and analyzed with a tandem time-of-flight system. In the range n=3 to 41 the relative ion intensities in photofragmentation spectra reflect the relative stabilities of the ion products. Moreover the photon-energy dependence of the fragmentation patterns suggests that photodissociation proceeds rather via a fast sequential evaporation of neutral monomers than via a fission process. A value can be deduced for the mean binding energy per atom which is increasing with the cluster size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453944
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  • 7
    Electronic Resource
    Electronic Resource
    Dynamical consequences of nonideal mixing in continuously stirred tank reactor studies of chemical instabilities: comparative stirring effects of premixed and nonpremixed feeds on the bistable chlorite (ClO2-) + iodide (I-) reaction (1986)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 90 (1986), S. 313-315 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100274a022
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  • 8
    Electronic Resource
    Electronic Resource
    Adiabatic unimolecular dissociation of heterogeneous alkali clusters (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 3732-3735 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The unimolecular dissociation of metastable photoionized mass-selected heterogeneous alkali clusters is investigated using a tandem time-of-flight spectrometer. NaK+n and Nan K+ are found to dissociate by evaporation of either a single neutral atom or a neutral dimer of the most abundant constituant. This behavior differs from the evaporation of heterogeneous neutral clusters which might always evaporate potassium in order to explain the sodium enrichment in the NaxKy neutral cluster distributions. This difference in the dissociation patterns of neutral and ionic heterogeneous clusters puts into evidence the influence of the charge in unimolecular dissociation processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453872
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  • 9
    Electronic Resource
    Electronic Resource
    A crisis in the Belousov-Zhabotinskii reaction: Experiment and simulation (1987)
    Springer
    Journal of statistical physics 48 (1987), S. 977-990 
    Details
    ISSN: 1572-9613
    Keywords: Nonlinear dynamics ; chaos ; crisis ; Belousov-Zhabotinskii reaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An abrupt transition that has the character of aninterior crisis was observed in an experiment on the Belousov-Zhabotinskii reaction as a control parameter was varied (a crisis is a qualitative change in the dynamics of a system observed when an attractor collides with the stable manifold of a fixed point). The interpretation of the observed behavior as a crisis is corroborated by a numerical analysis of a seven-variable model of the reaction. The waveforms, attractors, and maps obtained in the simulation are remarkably similar to those obtained in the laboratory experiment. The simulation indicates that the crisis is a consequence of a multivalued first return map.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01009527
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  • 10
    Electronic Resource
    Electronic Resource
    Chlamydia trachomatis genital infections in tahiti (1988)
    Springer
    European journal of clinical microbiology & infectious diseases 7 (1988), S. 635-638 
    Details
    ISSN: 1435-4373
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The rate ofChlamydia trachomatis infection was determined in three populations in Tahiti by means of a direct immunofluorescence test performed in specimens, tissue culture and detection of chlamydial antibody in serum specimens using a single-serotype indirect immunofluorescence test.Chlamydia trachomatis was recovered in 53 % of 53 bar girls, 24 % of 75 women attending a public maternity clinic for routine care, and 37 % of 71 men attending a sexually transmitted disease clinic with acute or subacute urethritis. The presence of chlamydial antibody in a high proportion of the groups studied confirmed the high frequency of chlamydial infections (62.3 %, 66.6 % and 83.1 % respectively).Neisseria gonorrhoeae infection was often associated with chlamydial infection in both bar girls and men with urethritis (11.4 % and 18.3 % respectively). With regard to clinical manifestations, 58.3 % (7/12) of bar girls and 23.2 % (10/43) women at the maternity clinic without clinical complaints were found to beChlamydia trachomatis-positive. The presence ofChlamydia trachomatis in these asymptomatic persons highlights their important role in spread of this organism in Tahiti. The findings indicate that routine testing forChlamydia trachomatis is warranted in patients attending the sexually transmitted disease and public maternity clinics in Tahiti.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01964241
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