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
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 822-823 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A modified theory is presented for the effect of multiple nucleation events on heterogeneous nucleation rates which was recently investigated by Weinberg in J. Chem. Phys. 92, 7515 (1990). A different and more reasonable expression is proposed for the intrinsic nucleation rate on an impurity particle as a function of the number of nuclei already present in the particle. By using it a simple analytical expression is derived for the overall heterogeneous nucleation rate and is compared with Weinberg's result.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 2471-2475 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We investigated theoretically the geminate electron–ion recombination in the limit of large electron mean free path by using the concept of diffusion in energy space. The energy diffusion equation is derived and the energy diffusion coefficient is evaluated. An analytical expression for the escape probability of the electron–ion pair is derived. It reproduces the numerical results very well which were obtained previously by using a Monte Carlo method. Experimental implications of the present theoretical findings are discussed.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 6929-6935 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We investigate how the dynamics of geminate recombination between a positive ion and an electron depends upon the mean free path of the electron for scattering by the solvent. We calculate the escape probability of geminate recombination as a function of the electron mean free path, by use of the Monte Carlo method we previously developed. When the mean free path is negligibly short compared with the Onsager length, the calculated escape probability agrees with the Onsager result. However, it increases with increasing mean free path and becomes much higher than the Onsager result, for long mean free paths. We also study how the effect of an applied electric field on the escape probability is influenced by the length of the electron mean free path. Our theory quantitatively explains recent experimental data on free ion yields in liquids such as methane, argon, and tetramethylsilane, which sustain high electron mobilities or equivalently long electron mean free paths.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 4622-4626 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The relation between the fractal geometry of reactant trajectories and the rate of diffusion-controlled reactions is considered. A new possible mechanism for the effect of an external electric field on the rate of reactions is proposed on the basis of this consideration. The proposed mechanism predicts an increase in the rate constant with increasing electric field strength. Experiments in the literature which may be related with the proposed mechanism are surveyed. Finally directions in future extensions of the present study are suggested.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 117 (2002), S. 1377-1384 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report a Brownian dynamics (BD) simulation study of the Förster energy transfer in a dye-labeled Rouse polymer chain. The simulation method is based on the normal mode BD propagation and numerical path integration of the survival probability. It is shown that a properly constructed truncated normal-mode approximation (TNMA) can speed up the simulations considerably, without essential loss of accuracy. In particular, an effective-sink TNMA scheme is found to be quite efficient. The idea is based on a standard time scale separation ansatz, where all the normal modes are separated into slow and fast, in terms of the corresponding relaxation times. The fast normal modes are assumed to be equilibrated in the course of reaction and thus can be integrated out. Their effect is to modify the reaction sink for the slow modes. The first-order approximation can be handled most easily, without a simulation. Even this simple approximation can be preferable to the well-known Wilemski–Fixman approximation, if the reaction sink is wide, i.e., when the Förster radius exceeds the polymer mean bond length, the condition often chosen in experiments on polymer folding. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In a previous paper [S. Iwai et al., J. Chem. Phys. 112, 7111 (2000)] we have found ultrafast electron transfer (ET) which occurs between donor and acceptor molecules at short distances. We incorporate this ultrafast ET in the calculation of the second-order ET rate in order to explain the discrepancies between experimental [D. Rehm and A. Weller, Isr. J. Chem. 8, 259 (1970)] and theoretical [M. Tachiya and S. Murata, J. Phys. Chem. 96, 8441 (1992)] ET rates. The effect of the short-distance ET is significant in the Marcus normal region where the Marcus-type ET is not very fast. Compared to the case where the original Marcus equation is used as the first-order ET rate, the calculated second-order rate is found to increase by several orders of magnitude in the normal region. Thus the discrepancy between theory and experiment is potentially resolved and the importance of the short-distance ET in fluorescence quenching demonstrated. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 3441-3446 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: When a ligand escapes from a heme-pocket of a protein, the migration is geometrically controlled. A model is proposed by Zwanzig for a rate process that is controlled by passage through a fluctuating bottleneck. The model predicts that the long-time rate constant is inversely proportional to the square-root of the solvent viscosity, which is qualitatively consistent with experimentally observed rate constants. For a reverse process, namely, ligand rebinding to the heme from the solvent phase, diffusion motion of ligands in the solvent should be taken into account in addition to bottleneck fluctuations. In this article, we generalize the Zwanzig model in such a way to include the translational diffusion motion of ligands. The bimolecular rebinding rate is expressed in terms of a continued fraction which converges rapidly. It is shown that in this case the fractional power dependence does not hold for any values of the translational diffusion constant. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Optical response due to the photo excited carrier or exciton dynamics in a one-dimensional (1D) dimethylglyoxime Pt complex [Pt(dmg)2] has been investigated by femtosecond pump–probe spectroscopy. Measurements were made at several excitation energies between the exciton state and the free electron hole pair state. Induced absorption was observed in the low-energy side of the exciton band at any excitation energy. The spectral shape of the induced absorption changed with time between 0.1 and 0.3 ps after instantaneous rise up. These results can be explained by the formation and thermalization processes of the relaxed excited state on the adiabatic potential surface. The unthermalized relaxed excited state is formed in a very short time (<50 fs). From the Raman spectrum, the frequency of the intermolecular stretching mode along the chain was estimated to be 80 cm−1 (T∼400 fs). These facts suggest that, in contrast to other 1D systems such as polydiacetylenes (PDA) and halogen bridged mixed valence metal complexes (MX), the formation of the relaxed excited state is caused not by the stretching vibration along the 1D chain. We propose the possibility that the triggering of the primary relaxation is caused by a high frequency (>600 cm−1) intramolecular mode which is not in the direction of the 1D chain. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 9
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...