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  • 1
    Electronic Resource
    Electronic Resource
    Substituent effects on intermolecular electron transfer: coumarins in electron-donating solvents (1993)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 115 (1993), S. 7922-7923 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00070a066
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular orbital and resonance Raman studies of the structures of N,N'-disubstituted indigo dyes (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 3431-3434 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Molecular orbital calculations have shown that the structures of both trans and cis isomers of N,N'-disubstituted indigo dyes are considerably twisted about the central C=C bond. The twisting angle of the cis isomer is not always larger than that of the corresponding trans isomer, indicating that the large hypsochromic shift on the trans→cis isomerization of N,N'-disubstituted indigo dyes cannot be explained by the twisted structure of the cis isomer. It is shown that the hypsochromic shift can be ascribed to a larger contribution of the zwitterionic form to the resonance hybrid structure in the lowest excited singlet state S1 than in the ground state S0 .This makes the repulsion between the negative charges on the carbonyl oxygen atoms enhanced and the instability of the cis configuration compared to the trans configuration much larger in the S1 state than in the S0 state and leads to a larger vertical S1 ←S0 transition energy for the cis isomer than for the trans isomer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456917
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  • 3
    Electronic Resource
    Electronic Resource
    Deuterium isotope effect on the solvation dynamics (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 7758-7760 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Deuterium isotope effect on the solvation dynamics is observed in the system of aniline (AN) as a solvent for the first time by the dynamic Stokes shift method. Perdeuterated AN (AN–d7) or amino deuterated AN (AN–d2) shows slower solvation dynamics than normal AN. Deuterium effect on the solvation of N,N–dimethylaniline (DMA) is also studied and there is no isotope effect on the solvation process. The differences between AN and DMA are proposed to be related to the presence and absence of the intermolecular hydrogen bondings. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469028
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  • 4
    Electronic Resource
    Electronic Resource
    Temperature dependence of ultrafast intermolecular electron transfer faster than solvation process (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 5717-5726 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Temperature dependence of intermolecular electron transfer (ET) between oxazine 1 (OX 1) in the excited state and electron donor solvents such as aniline (AN) and N,N-dimethylaniline (DMA) was studied by observing fluorescence dynamics of OX1. The fluorescence decay of OX1 in DMA showed a single exponential behavior with a time constant of ∼280 fs which was independent of temperature over the range of 280 to 353 K. In AN, the ET caused nonexponential fluorescence decay whose time constants range from a few hundred femtoseconds to a few picoseconds depending on temperature. The time constants of these ET were smaller than the solvation times obtained by dynamic fluorescence Stokes shift of coumarin 102. This indicates the importance of vibrational nuclear motion in ET. The extended Sumi–Marcus two-dimensional reaction coordinate model which concerns the effect of high frequency mode was applied to explain the experimental observations. Good agreements were obtained between the experiments and calculations in terms of necessary parameters such as electronic matrix element and solvent reorganization energy. The difference between the ET of OX1 in DMA and AN can be mainly explained by the free energy difference between the reactant and the product.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467357
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  • 5
    Electronic Resource
    Electronic Resource
    Observation of Ultrafast Energy Transfer from the Accessory Bacteriochlorophylls to the Special Pair in Photosynthetic Reaction Centers (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 6263-6266 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100017a001
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  • 6
    Electronic Resource
    Electronic Resource
    Dynamic Aspects of Ultrafast Intermolecular Electron Transfer Faster Than Solvation Process: Substituent Effects and Energy Gap Dependence (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 653-662 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100002a033
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  • 7
    Electronic Resource
    Electronic Resource
    Solute–solvent interaction dynamics studied by photon echo spectroscopies in polymer glasses (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 6175-6183 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The influence of coupling strength and temperature on the solute–solvent interaction of two chromophores in polymer glass is reported. The three-pulse photon echo peak shift method was used to study the dye IR144 in polyvinylformal (PVF) and the dye DTTCI (3,3′-diethylthiatricarbocyanine iodide) in polymethylmethacrylate (PMMA). IR144 is more strongly coupled (larger reorganization energy) to both its intramolecular modes and to the solvent than is DTTCI. Our results can be well described by the linearly coupled harmonic bath model over the range 300 to 30 K. In particular, the strikingly different temperature sensitivities of the long-time (asymptotic) peak shift are well described by the theory. Temperature-independent spectral densities and inhomogeneous widths suffice to quantitatively describe the peak shift data over this temperature range and a number of numerical predictions based on the theoretical model are experimentally confirmed. An ultrafast component corresponding to a decay of ∼100 fs time scale in the transition frequency correlation function is found in all cases, though the amplitude is small for the DTTCI solutions. This ultrafast response is assigned to the inertial response of the solvent. The inertial response measured for DTTCI in PMMA is very similar to our previous measurements of the inertial response for IR144 in PMMA, suggesting that a general characteristic of the solvent is being probed. The weaker coupling of DTTCI produces a drastic increase in the width of the photon echo signal as predicted by theory and strong vibrational quantum beats at 30 K. By contrast, such beats are not observed in the echo signal for IR144. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477246
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  • 8
    Electronic Resource
    Electronic Resource
    Three pulse stimulated photon echo experiments as a probe of polar solvation dynamics: Utility of harmonic bath models (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 6094-6108 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The three pulse photon echo peak shift technique was used to study solvation dynamics in acetonitrile (297 K), methanol (297 and 323 K), and ethylene glycol (297 and 397 K) utilizing the tricarbocyanine laser dye, IR144, as a probe. The spectral density, ρ(ω), governing the solute-solvent interaction was obtained for each solvent and temperature through numerical fitting of the three pulse photon echo peak shift relaxation using finite temporal-duration optical fields. An ultrafast three pulse photon echo peak shift relaxation, ascribed to the inertial component, was nearly identical for ethylene glycol at 297 and 397 K; this indicates the spectral density is essentially temperature independent from 10 to 250 cm−1 over this temperature range. Conversely, the low-frequency spectral density (0–10 cm−1) obtained from three pulse photon echo peak shift relaxation of ethylene glycol at 297 and 397 K showed a strong temperature dependence which cannot be predicted using harmonic bath models. We calculated spectral densities for ethylene glycol, acetonitrile, and methanol using the simple dielectric continuum model and the dynamical mean spherical approximation, using where possible, the relative permittivity constants calculated from experimental far-infrared absorption data and dielectric dispersion data. Additionally, we calculated spectral densities in terms of the extended reference interaction site model for methanol and acetonitrile. These calculated spectral densities describe our experimental methanol and acetonitrile photon echo better than all other solvation model spectral densities. Our results give insight into the domain of applicability of the harmonic model of liquid dynamics. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474277
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  • 9
    Electronic Resource
    Electronic Resource
    Temperature dependence of optical dephasing in an organic polymer glass (PMMA) from 300 K to 30 K (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 4840-4852 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The temperature dependence of the optical dephasing mechanism in an organic polymer glass, polymethylmethacrylate (PMMA), was studied from 300 K to 30 K using the dye IR144 as a probe. Transient grating and three pulse photon echo measurements were made, and the three pulse photon echo peak shift (3PEPS) was recorded as a function of temperature. The peak shift data reveal time constants of ∼6 fs and ∼60 fs, along with vibrational beats and a long-time constant value for the peak shift. The 6 fs component is attributed to intramolecular vibrations and the 60 fs component to librational degrees of freedom of the PMMA itself. This contribution appears slightly underdamped and the fitted spectral density matches well with the Raman spectrum of PMMA. The two ultrafast decays are insensitive to temperature. For temperatures above 80 K the long-time peak shift increases linearly as temperature decreases but at 80 K the shift levels off and decreases for temperatures between 80 and 30 K. Fit values for the inhomogeneous width (500 cm−1) and the reorganization energy (378 cm−1) describe the initial value of the peak shift, its decay, the absorption spectrum, and the three-pulse photon echo signal quite well at both high and low temperature. We were not very successful in describing the temperature dependence of the long-time peak shift, although the insensitivity of the dynamics to temperature could be qualitatively accounted for. At low temperature the imaginary portion of the line shape function, which is temperature independent, contributes significantly to the response, while at high temperature the dephasing is dominated by the real part of the line shape function. A more sophisticated model is required to quantitatively describe the data. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473533
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  • 10
    Electronic Resource
    Electronic Resource
    Isolation and characterization of a human cDNA homologous to the Xenopus laevis XCAP-C gene belonging to the structural maintenance of chromosomes (SMC) family (1999)
    Springer
    Journal of human genetics 44 (1999), S. 197-202 
    Details
    ISSN: 1435-232X
    Keywords: Key words Mitosis ; Chromosome condensation ; SMC (structural maintenance of chromosomes) family ; hCAP-C (human chromosome associated polypeptide-C) ; Chromosome 3q26.1
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We have isolated a human cDNA encoding a protein of 1288 amino acids that shows 77% identity in amino acid sequence to XCAP-C, Xenopus chromosome-associated polypeptide-C, belonging to the family of structural maintenance of chromosomes (SMC), which is known to play a crucial role in the proper condensation and segregation of mitotic chromosomes. In particular, an almost 200-amino-acid domain in the N-terminal, including an NTP-binding motif and that in the C-terminal domain, including a DA-box, were well conserved and showed 95% identity between human and frog, indicating that these two domains are functionally very important. The transcript of this gene was expressed ubiquitously in various human tissues, but thymus, testis, and colon seemed to express this gene more abundantly. We also determined its chromosomal location at 3q26.1 by fluorescence in situ hybridization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100380050142
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