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  • 1
    Electronic Resource
    Electronic Resource
    Pressure induced phase transitions in pentacene doped para-terphenyl probed by changes in the impurity absorption spectrum (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 3137-3138 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The pressure dependence (0–10 kbar) of the low temperature (15 K) absorption spectrum of pentacene impurities in a para-terphenyl host crystal is used to investigate the pressure and/or temperature induced triclinic to monoclinic phase change of the para-terphenyl host crystal. Due to the characteristic absorption spectrum of pentacene in these two crystal phases, the pentacene impurity proves to be a sensitive probe of the structure of the surrounding para-terphenyl matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465169
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  • 2
    Electronic Resource
    Electronic Resource
    X-ray induced luminescence of solid argon at high pressures: A pressure probe (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 3721-3722 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Above 7 GPa, visible luminescence is observed when argon in a diamond anvil cell is irradiated by high energy x rays from a synchrotron source. The spectrum consists of two peaks which shift by −43.6±0.7 cm−1/GPa and −47.5±2.4 cm−1/GPa from ambient pressure emission energies of 17 900±40 and 17 300±140 cm−1, respectively. These shifts are linear up to 60 GPa and reversible on decompression. Extrapolation of the shifts to ambient pressure suggests that this is a 4p–5d atomic transition. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126761
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  • 3
    Electronic Resource
    Electronic Resource
    Temperature and Pressure Dependent Optical Dephasing of Pentacene in Triclinic and Monoclinic p-Terphenyl (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 7324-7329 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100019a016
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  • 4
    Electronic Resource
    Electronic Resource
    Temperature-dependent optical dephasing in sol-gel glasses: Photon echo measurements of rhodamine 101 and quinizarin doped aluminosilica xerogels (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 9880-9883 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Temperature-dependent (1.2–2.1 K) photon echo measurements have been performed on quinizarin and rhodamine 101 doped into aluminosilica sol-gel glasses as well as rhodamine 101 doped poly-methyl-methacrylate (PMMA) polymer. We observe a temperature-dependent homogeneous linewidth for both quinizarin and rhodamine in the aluminosilica xerogel (ASX) matrix proportional to T2, in contrast to the T1.3±0.1 linewidth dependence typically observed for a variety of organic and inorganic glass hosts in this temperature range (including rhodamine 101 doped PMMA). The contrasting optical dephasing results for the ASX glass and PMMA suggest that the ASX glass may have unique two-level-system dynamics. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469955
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  • 5
    Electronic Resource
    Electronic Resource
    The effect of pressure on the fluorescence lifetime of pentacene in para-terphenyl at low temperature (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 23-27 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Time resolved fluorescence measurements are presented as a function of pressure for pentacene in para-terphenyl at low temperature. A photosite specific pressure effect is observed at low temperature for the triclinic (P≤5.5 kbar) phase of para-terphenyl. In addition, the fluorescence lifetime of pentacene in the monoclinic (high pressure) crystal phase at low temperature is obtained. We also observe unique fluorescence decay dynamics in the pressure region (5.5–6.5 kbar) intermediate to the triclinic and the monoclinic crystal phases. The effect of pressure on the triclinic host crystal is discussed in terms of a lowering of the energy of the lowest singlet excited state (S1) relative to the nearby triplet level (T2) with a corresponding decrease in the intersystem crossing rate. The fluorescence dynamics also provide information on the nature of the pentacene environment in the higher pressure (i.e.(approximately-greater-than)5.5 kbar) structural phases of the p-terphenyl host crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466992
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  • 6
    Electronic Resource
    Electronic Resource
    The low-temperature dynamics of rhodamine 640 in polyvinylalcohol (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 9510-9511 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The low temperature (1.2–2.1 K) dynamics of rhodamine 640 in polyvinyl alcohol have been investigated by 2-pulse photon echo measurements. The low temperature dephasing results of this study cannot be fit utilizing only the tunneling two-level-system (TLS) model used to describe the higher temperature (10–30 K) data of Nakanishi et al. [J. Chem. Phys. 100, 3442 (1994)] on the same system. In the present study, both the low temperature (1.2–2.1 K) data and the high temperature (10–30 K) data of Nakanishi et al. are fit by a model which includes both a TLS and an electron–phonon contribution to the optical dephasing, yielding a homogeneous dephasing rate (T2*)−1=aTα+b(exp(ΔE/kT)−1)−1, where α=4/3, a=(2915 ps)−1, b=(2.9 ps)−1 and ΔE=16.7 cm−1. The present results indicate that TLS models alone are not sufficient to describe the optical dynamics of Rh640 in PVA at temperatures above 5 K. This is particularly important for studies which attempt to use chemical or physical modification of the matrix to investigate the nature of TLS. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469962
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  • 7
    Electronic Resource
    Electronic Resource
    Molecular dynamics observed 60 ps behind a solid-state shock front (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 8313-8321 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Microfabricated monolithic shock target arrays with embedded thin layers of dye-doped polymer films, termed optical nanogauges, are used to measure the velocity and pressure (Us=3.5 km/s; P=2.1 GPa) of picosecond-laser-driven shock waves in polymers. The 60 (±20) ps rise time of absorbance changes of the dye in the nanogauge appears to be limited by the transit time of the shock across the 300 nm thick gauge. The intrinsic rise time of the 2 GPa shock front in poly-methyl methacrylate must therefore be ≤60 ps. These measurements are the first to obtain picosecond resolution of molecular dynamics induced by the passage of a shock front through a solid. Good agreement was obtained between the nanosecond time scale shock-induced adsorption redshift of the dye behind the P=2 GPa shock front, and the redshift of a nanogauge, under conditions of static high pressure loading in a diamond anvil cell at P=2 GPa. Transient effects on the ≈100 ps time scale are observed in the dye spectrum, primarily on the red absorption edge where hot-band transitions are most significant. These effects are interpreted as arising from transient overheating and subsequent fast cooling of the dye molecules behind the shock front. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470143
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  • 8
    Electronic Resource
    Electronic Resource
    New phase of an oxygen-nitrogen alloy at high pressure and room temperature detected by Raman spectroscopy (1989)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 93 (1989), S. 1683-1687 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100342a003
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  • 9
    Electronic Resource
    Electronic Resource
    High-pressure binary phase diagram of nitrogen-oxygen at 295 K determined by Raman spectroscopy (1990)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 94 (1990), S. 1073-1078 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100366a009
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  • 10
    Electronic Resource
    Electronic Resource
    Impulsive stimulated scattering in ice VI and ice VII (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 4540-4544 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We demonstrate the use of forced thermal Brillouin scattering to obtain acoustic velocities for oriented high-pressure crystals of ice VI and of ice VII. The elastic constants of ice VI and ice VII determined from these measurements compare favorably with classical Brillouin scattering results. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475882
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