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  • 1
    Electronic Resource
    Electronic Resource
    Sonographic findings of intraabdominal foreign bodies due to retained gauze (1984)
    Springer
    Abdominal imaging 9 (1984), S. 61-63 
    Details
    ISSN: 1432-0509
    Keywords: Abdomen, foreign bodies ; Retained gauze, ultrasound diagnosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The ultrasonic images obtained in 2 patients with retained gauze in the abdomen are presented. Identification of a cystic mass with highly irregular internal echoes in patients with previous laparotomy should alert the radiologist to the possibility of foreign body retention.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01887803
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamical temporal evolution of molecular IR absorption spectra observed with picosecond CO2 laser pulses (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 128-138 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The variation of the collisionless absorption spectral shapes for vibrationally excited SF6 and C2F5Cl molecules as a function of the picosecond probe pulse duration was determined using a two-IR frequency pump–probe scheme. The experiments revealed a spectral narrowing with decreasing pulse duration, similar to a recent observation in C3F7I with a single laser pulse. For C2F5Cl, the vibrational temperature dependence of the spectral narrowing was also studied. The observed experimental results are shown to be consistent with a dynamic multitier classification of energy levels in the QC of polyatomic molecules. An empirical calculation was used to evaluate the relevant parameters associated with the intramolecular coupling. Specifically, the time constants for such a coupling are evaluated to be 〉20 ps for all the molecules studied. The effect of variable density of states on the time constant and spectral width is also discussed on the basis of the C2F5Cl data. It was found that both the redshift and the degree of spectral broadening increased with the internal energy of the molecule. The redshift was also observed to saturate at 〈n〉∼13. This dynamical spectral measurement is distinguished from the usual static spectral measurements in that the laser–molecule interaction time is used as a parameter, thus circumventing the usual pitfalls of inferring dynamical information from spectral measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453609
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  • 3
    Electronic Resource
    Electronic Resource
    Spin-forbidden radiative decay of the a 4Πu state of O+2 (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 508-515 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The spin-forbidden radiative decay of a 4Πu O+2 has been measured in a radio frequency octopole ion trap. Photodissociation is used to probe the a 2Πu population as a function of trapping time. We have found that the a 4Πu state exhibits a multiple exponential decay, ranging from a few milliseconds to hundreds of milliseconds. The state dependence of the decay is seen in the photodissociation spectrum (b 4Σ−g←a 4Πu), which changes dramatically from 0.1 to 100 ms. The major changes in the spectrum are simulated by assuming that the F2 and F3 spin components of the a 4Πu state decay faster than the F1 and F4 components. We can account for this dependence on spin sublevel by assuming that the primary mechanism for radiative decay arises from spin-orbit coupling of the a 4Πu and A 2Πu states. Our results suggest that the a 4Πu radiative lifetime of 0.22 s measured by O'Keefe and McDonald reflects the decay of only the longest living a 4Πu sublevels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452302
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  • 4
    Electronic Resource
    Electronic Resource
    State-resolved ultrafast internal conversion in chromyl chloride (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 6771-6776 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The technique of infrared multiphoton ionization was used to obtain state specific internal conversion rates in CrO2 Cl2. Using tunable 10 ps dye laser pulses, different vibrational states in the B1 manifold were excited and the energy relaxation was monitored by an IR ps laser pulse. The relaxation can be characterized by a fast component, which is due to internal conversion to the 1 A1 state, and a slow component, which is due to cooling of the vibrationally hot 1 A1 ground state. The nonradiative energy transfer rate changes by almost three orders of magnitude for an excess vibrational energy change of merely 550 cm−1. The possibility of state specific pumping of 1 A1 is also pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455351
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  • 5
    Electronic Resource
    Electronic Resource
    On the intensity dependence of infrared excitation in C3F7I (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 5041-5044 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The question of intensity vs energy fluence dependence in the IR excitation of a polyatomic molecule in the quasicontinuum is addressed. It was found that the energy fluence scaling law breaks down for laser pulses shorter than ∼100 ps for C3F7I. This is consistent with similar results obtained previously for SF6 and C2F5Cl. The reason for the increased intensity dependence is physically due to an increase in the intrinsic small signal absorption cross section of the polyatomic molecules for short interaction times. This increase in the absorption coefficient is not intensity related and is a fundamental property of a dense ensemble of interacting states. The change in the absorption cross section for all molecules studied reveals a nonequilibration of energy relaxation among all the states even for 100 ps pulses. This nonequilibrium situation can be exploited to achieve ps nonstatistical photochemistry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451694
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  • 6
    Electronic Resource
    Electronic Resource
    Inhibition of mitochondrial respiration by analogs of 4-phenylpyridine and 1-methyl-4-phenylpyridinium cation (MPP^+), the neurotoxic metabolite of MPTP
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 148 (1987), S. 684-693 
    Details
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0006-291X(87)90931-4
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  • 7
    Electronic Resource
    Electronic Resource
    Vibrational predissociation of benzene dimers and trimers by the crossed laser-molecular beam technique (1981)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 85 (1981), S. 3327-3333 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150622a024
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  • 8
    Electronic Resource
    Electronic Resource
    As-deposited Y-Ba-Cu-O superconducting films on silicon at 400 °C (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 578-580 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Y-Ba-Cu-O thin films have been grown on silicon at a substrate temperature of 400 °C by plasma-assisted laser deposition technique. These films were superconducting in an as-deposited state. Films deposited directly on silicon and films with a MgO buffer layer differed in their superconducting properties. Films with a MgO layer showed higher critical temperatures (70 K) and higher critical currents (3×103 A/cm2 at 31 K) than films deposited directly on Si. Depth profiling by Auger and x-ray photoelectron spectroscopy has been employed to study the diffusion and structural variation near the interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101462
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of buffer layers on low-temperature growth of mirror-like superconducting thin films on sapphire (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 295-297 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Plasma-assisted laser deposition was used to grow high quality mirror-like superconducting Y-Ba-Cu-O films on sapphire with or without a buffer layer. The buffer layers of MgO, Ag, or BaTiO3 were also laser deposited. At a deposition temperature of 400–500 °C, the as-deposited Y-Ba-Cu-O films on MgO/Al2O3, Ag/Al2O3, BaTiO3/Al2O3, and plain Al2O3 substrates were all superconducting at (approximately-greater-than)75 K without post-annealing. The orientation of the film and the critical current are both affected by the presence of the buffer layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102409
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  • 10
    Electronic Resource
    Electronic Resource
    Nature of in situ superconducting film formation (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1041-1043 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The resistivity of a Y-Ba-Cu-O film was monitored during laser deposition in real time. Both deposition parameters leading to in situ films and those requiring high-temperature (850 °C) post-annealing were examined. It was found that in both cases, the resistivity was dependent on the oxygen partial pressure during deposition, and that filling the chamber with oxygen immediately after deposition was crucial to the formation of the superconducting phase. Oxygen outdiffusion during deposition at high temperature (600 °C) was found to be the major obstacle to true in situ film formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101725
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