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  • 1
    Electronic Resource
    Electronic Resource
    Femtosecond time-resolved coherent anti-Stokes Raman spectroscopy of liquid benzene: A Kubo relaxation function analysis (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 3244-3251 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Femtosecond time-resolved coherent anti-Stokes Raman scattering (TRCARS) for the ν1 ring-breathing mode of neat benzene-h6 and benzene-d6 are reported at room temperature (25 °C) and at 6.5 °C. Ultrafast time resolution permits close investigation of the dephasing dynamics at early times. Deviation from the conventional exponential decay is found. The data are analyzed using Kubo line shape theory. The correlation time τc and the rms magnitude Δ of the Bohr frequency modulation are determined for the process responsible for the vibrational dephasing and for the linewidth. Spinning motion is suggested as the stochastic process responsible for the vibrational dephasing in those neat liquids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466194
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Third-order nonlinear time domain probes of solvation dynamics (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 6089-6108 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Several closely related third-order nonlinear time-resolved spectroscopic techniques, pump/probe transient absorption, transient grating, and three pulse stimulated photon echo peak shift measurements, are investigated theoretically and experimentally. It is shown in detail, through the consideration of response functions and numerical simulations including both finite pulse durations and detuning from exact resonance, how the solvation dynamics are manifested in these third-order nonlinear time-resolved spectroscopies. It is shown that the three pulse stimulated photon echo peak shift measurement and the transient grating measurement can give accurate dynamical information, whereas transient absorption may not be a reliable technique for a study of solvation dynamics in some cases. The contribution of very slow or static (inhomogeneous) components to the dynamics, however, can only be obtained from the three pulse echo peak shift measurements. Comprehensive experimental measurements are presented to illustrate and corroborate the calculations. We show that it is possible to separate the intramolecular vibrational and solvent contributions to the dephasing (or optical lineshape). Furthermore it is shown that the solvation of polar solutes in polar protic solvents has rather universal characteristics. The initial ultrafast process, usually identified as an inertial response of solvent molecules, occurs on a ∼100 fs time scale, and is essentially identical in methanol, ethanol, and butanol. The amplitude of this ultrafast component does, however, decrease with increasing alcohol size in 1-alkanols. The diffusive ((approximately-greater-than)0.5 ps) regime of the solvation process shows a strong solvent dependence, and may be described satisfactorily by dielectric relaxation theories. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471276
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  • 4
    Electronic Resource
    Electronic Resource
    Ultrafast liquid dynamics studied by third and fifth order three pulse photon echoes (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 4063-4068 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report a new spectroscopic measurement based on fifth order nonlinear response from a molecule in a room temperature liquid. In conjunction with conventional three pulse stimulated photon echo, detailed information on solvent–solute dynamics for a wide range of time scales has been obtained. Both the ultrafast inertial components and much slower dynamics of the solvent are found to make important contributions to the solvent relaxation. The potential of the fifth order measurements is discussed via numerical calculations using model solvent spectral densities. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468534
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  • 5
    Electronic Resource
    Electronic Resource
    Inverse transform in resonance Raman scattering: an iterative approach (1993)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 97 (1993), S. 1262-1264 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100109a004
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  • 6
    Electronic Resource
    Electronic Resource
    Ultrafast optical dynamics of excitons in J-aggregates (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 377-381 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Time evolution of the coherence properties of excitons in J-aggregates of an organic molecule is studied by femtosecond transient absorption and three-pulse stimulated photon echo peak shifts. The exciton energy correlation function decays to zero by 120 fs single exponential, manifesting an ultrafast rupture of the coherent wave packet motion and the absence of inhomogeneity beyond the 100 fs time scale. Insensitivity of the correlation function to the isotopic substitution of the solvent suggests that the phonon modes of the molecular chain are responsible for the ultrafast dynamics. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1329133
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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    Deuterium isotope effect on the solvation dynamics of a dye molecule in methanol and acetonitrile (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 10969-10977 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Solvation dynamics of a dye molecule in methanol, acetonitrile, and their deuterated analogs has been measured by the three-pulse stimulated photon echo peak shift. The effects of deuterium substitution on the stationary fluorescence spectra and the time domain data are found to be significant in both solvents. Moreover, the deuterium isotope effects are contrasted in methanol and acetonitrile. The ultrafast component, found to be 200–260 fs, is not slowed down by the deuterium substitution of the hydroxyl group in methanol, and it is even slightly shortened by deuteration in acetonitrile. The isotope dependence and the time scales suggest that the ultrafast component is not originated from the inertial free rotation of the solvent molecules but from collective dispersive solvent motion, at least for the present system. In addition to the ultrafast and ps solvation time scales usually observed in methanol and acetonitrile, a large amplitude ns component is observed in all solvents. The amplitudes of the ns component are substantially different in isotopomers, showing the opposite trend in methanol and acetonitrile. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479034
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  • 9
    Electronic Resource
    Electronic Resource
    Transient absorption anisotropy study of ultrafast energy transfer in porphyrin monomer, its direct meso–meso coupled dimer and trimer (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 6750-6758 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Transient absorption anisotropies of the Zn(II)porphyrin monomer, its direct meso–meso coupled dimer, and trimer are measured in the B (Soret) band region by sub-30 fs laser pulses. It is shown that detailed information on the electronic structures and energy transfer dynamics can be obtained from the anisotropy and the magic angle data. The anisotropies of all three molecules exhibit remarkable behaviors in the first 200 fs region. Experimental observations can be accounted for adequately by treating the transient absorption signal as an explicit sum of ground state bleach and excited state stimulated emission contributions. In the monomer, the anisotropy decay denotes an oscillatory feature followed by a 100 fs time constant exponential decay. It is argued that the Bx and By transitions of the porphyrin monomer are nondegenerate with an energy splitting of ∼170 cm−1. Furthermore, equilibration of the excitation energy within the B states is slightly underdamped. Excitation of the monomerlike B band of the dimer (trimer) leads to ultrafast ∼30 fs (60 fs) anisotropy decay and a subsequent rise with ∼60 fs (70 fs) time constant. It is concluded that the anisotropy decay is due to the ultrafast energy transfer to the low-energy exciton split B band, while the rise is due to the redshift of the excited state stimulated emission spectrum thereby decreasing the contribution of the excited state stimulated emission component in the overall transient absorption signal. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1357438
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  • 10
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    Electrical properties and near band edge emission of Bi-doped ZnO nanowires (2007)
    American Institute of Physics
    Details
    Publication Date: 2007-02-19
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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