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  • 1
    Electronic Resource
    Electronic Resource
    Geometry of quotient spaces of SO(3)\SL(3, R) by congruence subgroups (1992)
    Springer
    Mathematische Annalen 293 (1992), S. 443-467 
    Details
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01444727
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrafast optical Kerr dynamics studied with incoherent light (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 3332-3346 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Femtosecond optical Kerr dynamics in various transparent liquids were measured using incoherent light with a 60 fs autocorrelation width. From the measurement of the optical Kerr effect (OKE) of binary mixtures of CS2 and various liquids, the contribution of the intermolecular interaction-induced polarizability change to the OKE was found to be affected remarkably by the femtosecond molecular dynamics of CS2. Especially, data from diluted solutions of CS2 in nonviscous solvents composed of molecules with a low molecular weight are consistent with the binary collision model in free space. An oscillatory feature, which was attributed to an intermolecular vibrational mode, was found in the OKE dynamics of neat benzene and several benzene derivatives. A theoretical expression for the delay-time dependence of the signal intensity was also derived with no restriction on the statistical properties of the incoherent light. It is expressed in terms of the autocorrelation function of the intensity fluctuation of the incident incoherent light which was utilized as both the pump and the probe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459756
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  • 3
    Electronic Resource
    Electronic Resource
    Diffusive torsional dynamics of malachite green molecules in solid matrices probed by fluorescence decay (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 6414-6425 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The torsional dynamics of phenyl rings of malachite green molecules in the excited state is studied in polymeric and monomeric glass matrices by measuring the fluorescence decay time as a function of temperature. It is shown that the phenyl rings rotate diffusively in solid polymers (polymethyl methacrylate and polyvinyl alcohol) quite rapidly even at low temperatures. To analyze the experimental results, we used the concept of microviscosity which controls the diffusive rotational motion of phenyl rings of malachite green molecules in solid matrices. By using the reaction-rate theory, we show that a horizontal excited-state potential surface rather than a downhill potential surface for the rotation of phenyl rings can more reasonably explain the rotational motion in polymers. If we assume that the potential is horizontal, the temperature dependence of the microviscosity can be described by Andrade equation with a definite activation energy which is known to be valid for many liquids over a wide range of temperatures. This implies that the microscopic dynamics of small molecular rotations in a solid polymer resembles the behavior in many liquids. By monitoring the fluorescence decay of malachite green molecules doped in ethanol monomeric glass during its phase transition, we show that the effects of phase transition are well represented in the fluorescence decay time. We then propose to use malachite green molecules as sensitive optical microprobes of local dynamics in various solid matrices and their phase transitions, etc. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470420
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  • 4
    Electronic Resource
    Electronic Resource
    Optical-heterodyne-detected induced phase modulation for the study of femtosecond molecular dynamics (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 937-945 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A new experimental technique for the study of ultrafast optical response of nonlinear materials, which detects nonrelaxational response in the media with high sensitivity, is introduced. Polarization-selective optical-heterodyne-detection scheme is applied to the measurement of the spectral shift of a probe pulse which is caused by induced phase modulation (IPM) brought about by a pump pulse. This technique, being sensitive to the high-frequency component of the nonlinear response, is especially applicable to the study of intermolecular dynamics in disordered media. The temporal responses of the optical Kerr effect in liquid carbon tetrachloride, benzene, and carbon disulfide are studied using this technique with femtosecond optical pulses. In the response of benzene, damped oscillations are clearly observed which are due to intermolecular vibrational motions of the molecules. The data obtained from benzene and carbon disulfide are analyzed using a Fourier-transform method. The response functions for the IPM measurements are reconstructed, and the Fourier spectra are also obtained. They are discussed in terms of inertial molecular motions and the local structures in these liquids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461102
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  • 5
    Electronic Resource
    Electronic Resource
    A white-light Michelson interferometer in the visible and near infrared regions (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 2854-2858 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A white-light Michelson interferometer in the visible and near infrared regions is described which can obtain the cross-correlation interferogram between the incident light and the transmitted light through samples or optical components. By comparing the autocorrelation interferogram of the incident white light with the cross-correlation interferogram between the incident light and the transmitted light, we can obtain linear response functions of samples or optical components with femtosecond time resolution. Fourier analysis of the interferograms gives also the complex optical constants of the samples without relying on the Kramers–Kronig relation. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149024
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  • 6
    Electronic Resource
    Electronic Resource
    Fabrication of refractive index grating into azo-dye-containing polymer films by irreversible photoinduced bleaching (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 3240-3244 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the direct fabrication of refractive index gratings by irreversible photoinduced bleaching (photobleaching) into azo-dye-containing polymer films with a large second-order optical nonlinearity. Gratings were formed into azo-dye-doped or attached polymer films upon exposure to an interference pattern of two laser beams from second harmonic light at 532 nm of a mode-locked Nd: yttrium–aluminum–garnet laser. To investigate whether the refractive index grating is formed into the azo-dye-containing polymer films by the two-beam interference exposure, IR spectroscopy was examined. Absorption strength from an azo bond in the exposed polymer film reduced selectively as compared with that of unexposed film. Although surface relief structure with a few nanometers depth on the polymer film was observed by using atomic force microscopy, the modulation depth of the grating was very small. So, we considered that the effect of the relief structure to diffraction efficiency obtained here is negligible. Furthermore, the grating could not be erased by light. From these results, we confirmed that the grating obtained here was mainly caused by photobleaching, not by photoinduced birefringence and/or optically induced surface relief grating. In addition, highly efficient gratings, 20% or more, could be formed by using the azo-polymer film. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372330
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  • 7
    Electronic Resource
    Electronic Resource
    Constructive and Destructive Two-Pulse Excitation Investigated with a White-Light Michelson Interferometer (1998)
    Springer
    Optical review 5 (1998), S. 263-266 
    Details
    ISSN: 1349-9432
    Keywords: two-pulse excitation ; Michelson interferometer ; phase control ; ultrashort pulse propagation ; Bloch vector
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Linear propagation of two pulses through methanol solution of aluminum phthalocyanine chloride is investigated using a modified white-light Michelson interferometer. The observed coherence time of the white light is 6 fs, and the separation between the two-excitation pulses is set to about 10 fs. The excitation is dependent on the phase-relation between the two pulses. We have observed an enhancement of the excitation when the two pulses are in-phase and strong suppression of the excitation when the two pulses are out of phase by π.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10043-998-0263-x
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  • 8
    Electronic Resource
    Electronic Resource
    Asymptotic geometry of arithmetic quotients of symmetric spaces (1996)
    Springer
    Mathematische Zeitschrift 222 (1996), S. 247-277 
    Details
    ISSN: 0025-5874
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00004534
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  • 9
    Electronic Resource
    Electronic Resource
    Adsorptive stripping voltammetry of anionic surfactants on a carbon paste electrode using ferrocenyl cationic surfactant as an analytical electrochemical probe (1997)
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 722-725 
    Details
    ISSN: 1040-0397
    Keywords: Adsorptive stripping voltammetry ; Ion association complex ; Ferrocenyl cationic surfactant ; Anionic surfactant ; Carbon paste electrode ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Adsorption stripping voltammetry (AdSV) for anionic surfactants was examined, based on ion association with an electroactive ferrocenyl cationic surfactant. The ion association complex between an anionic surfactant and a ferrocenyl cationic surfactant accumulated on the carbon paste electrode (CPE) in the absence of an applied potential. The concentration of anionic surfactant was indirectly evaluated from the oxidation wave of the ferrocenyl cationic surfactant. By means of AdSV, levels of anionic surfactants of 10-7 mol dm-3 could be measured with good selectivity. The role of pasting liquids on the accumulation behavior of ferrocenyl TMA were examined by a comparison of two pasting liquids. The first, 2-nitrophenyl octyl ether (NPOE) was capable of extracting the ferrocenyl TMA salt, while the other, di-n-octylphthalate (DOP) was not. The voltammograms of ferrocenyl TMA varied considerably with the pasting liquids. In particular, the peak potentials at NPOE-CPE gradually shifted with time, as a result of the extraction of the ferrocenyl TMA salt into the CPE. However, the peak potential at DOP-CPE remained constant.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140090913
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  • 10
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    Fabrication of refractive index grating into azo-dye-containing polymer films by irreversible photoinduced bleaching (2000)
    American Institute of Physics
    Details
    Publication Date: 2000-04-01
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics
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