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  • 2020-2022  (7)
  • 1995-1999  (90)
  • 1985-1989  (86)
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  • 1
    Electronic Resource
    Electronic Resource
    Estimation of the Poly(ethylene glycol) Chain Length of L-Polylactide-Polyethylene Glycol in Aqueous Dispersions Using Viscoelastic Measurements (1995)
    s.l. : American Chemical Society
    Langmuir 11 (1995), S. 1482-1485 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00005a013
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  • 2
    Electronic Resource
    Electronic Resource
    Multilevel cooperative amplified spontaneous emission from the I2(B→X) system (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 5-10 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amplified spontaneous emission (ASE) on the I2(B→X) system has been studied as a function of excitation wavelength by using a narrow-band pulsed dye-laser pump source. ASE output in the range 1.1–1.3 μm has been observed for dye-laser excitation wavelengths between 515 and 600 nm. Cooperative emission from several adjacent rotational levels has been observed and provides an explanation for anomalous spectral features. The conversion efficiency of dye-laser photons to ASE output was as high as a few percent. Pump energy thresholds as low as 5.0 μJ were observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339161
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  • 3
    Electronic Resource
    Electronic Resource
    Spectroscopic and kinetic studies of a dye laser pumped Br2 B 3Π(0+u) → X 1Σ+g laser (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 2526-2533 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A dye laser pumped Br2 B 3Π(0+u) → X 1Σ+g laser has been studied. Spectroscopic assignments have shown that lasing occurs from 10≤J'≤63 in 12≤v'≤17 using Rhodamine 590 dye. The output appeared limited to the 79–81 isotope of Br2. By utilizing stimulated emission as a monitor for laser excitation spectra, dramatic increases in the resolution were observed that exceeded the normal resolution of the dye laser. The Br2 laser operated at Br2 pressures of up to 60 Torr. A simple model to explain the characteristics of the Br2 laser is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450372
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  • 4
    Electronic Resource
    Electronic Resource
    Chemiluminescent reaction of selenium with fluorine: Assignment of the SeF A 2Π3/2 state (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 4544-4553 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Selenium reacts with fluorine with a weak visible chemiluminescence between 3800 and 8900 A(ring). Identical spectra are obtained regardless of whether the source of selenium is the elemental vapor or hydrogen selenide. By analogy with C10, TeF, and reevaluated SF absorption data, the SeF band system is assigned to transitions between inverted 2Π states. The spectroscopic constants for the A 2Π3/2 to X 2Π3/2 system are: Te=14 680.4 cm−1, ω‘e =688.8 cm−1, ωex‘e =1.84 cm−1, ω'e =444.1 cm−1, and ωexe =2.93 cm−1. The weak 2Π1/2 to 2Π1/2 subband is described by the constants: Te =15 025.4 cm−1, ω‘e =683.0 cm−1, ωex‘e =2.11 cm−1, ω'e =436.9 cm−1, and ωexe =1.20 cm−1. Laser excitation spectra were recorded for the SeF chemiluminescence flame. The SeF fluorescence between 4200 and 5200 A(ring) is rapidly quenched with increasing total pressure. A Stern–Volmer analysis gave a zero pressure lifetime of 12.8±3.9 μs. The measured quenching rate of 2.5×106 s−1 Torr−1 is nearly gas kinetic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449024
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  • 5
    Electronic Resource
    Electronic Resource
    Chemiluminescent reaction of tellurium with fluorine: The A 2Πi–X 2Πi and B 2Σ+–X2Πi transitions (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 5007-5012 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Te reacts with fluorine to give a strong chemiluminescence between 3800 and 8700 A(ring). The emission spectrum contains both 2Σ+–2Πi and 2Πi–2Πi systems. TeF emission bands are of the Hund's type (a) without spin forbidden intermultiplet crossing. Spin orbit coupling of the X 2Πi state is −497 cm−1 as determined from the 2Σ+–2Πi transition. Vibrational constants are reported for all states and compare favorably with those obtained from theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449766
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  • 6
    Electronic Resource
    Electronic Resource
    Spreading and imbibition of viscous liquid on a porous base (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 11 (1999), S. 48-57 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The competition between the viscous spreading of liquid on a substrate and the absorption by the substrate is studied using several models. The local behaviors near the contact lines, the time scales of droplet spreading and disappearance, and the dependencies on the physical factors that enter are discussed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869901
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  • 7
    Electronic Resource
    Electronic Resource
    Instabilities of a liquid film flowing down a slightly inclined plane (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 983-989 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Falling films on inclined planes display surface and shear instability modes, the latter being important at small angles β of inclination of the plane. These modes are analyzed with particular attention paid to the effects of surface tension. The results show that the critical Reynolds number of the shear mode is nonmonotonic in either the angle β or the surface-tension parameter ζ but displays a local minimum at nonzero values of β and ζ. For large Reynolds number, an analysis shows that the shear mode is inviscidly stable, but that the surface mode is unstable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866285
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  • 8
    Electronic Resource
    Electronic Resource
    The spreading of volatile liquid droplets on heated surfaces (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 7 (1995), S. 248-265 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A two-dimensional volatile liquid droplet on a uniformly heated horizontal surface is considered. Lubrication theory is used to describe the effects of capillarity, thermocapillarity, vapor recoil, viscous spreading, contact-angle hysteresis, and mass loss on the behavior of the droplet. A new contact-line condition based on mass balance is formulated and used, which represents a leading-order superposition of spreading and evaporative effects. Evolution equations for steady and unsteady droplet profiles are found and solved for small and large capillary numbers. In the steady evaporation case, the steady contact angle, which represents a balance between viscous spreading effects and evaporative effects, is larger than the advancing contact angle. This new angle is also observed over much of the droplet lifetime during unsteady evaporation. Further, in the unsteady case, effects which tend to decrease (increase) the contact angle promote (delay) evaporation. In the "large'' capillary number limit, matched asymptotics are used to describe the droplet profile; away from the contact line the shape is determined by initial conditions and bulk mass loss, while near the contact-line surface curvature and slip are important. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868623
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  • 9
    Electronic Resource
    Electronic Resource
    Shear stabilization of a solidifying front: Weakly nonlinear analysis in a long-wave limit (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 2319-2336 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The manufacturing of single crystals of multi-component materials with uniform material properties is frequently hampered by the presence of morphological instabilities during the solidification. In this paper we extend into the nonlinear regime our previous work on the influence of shear flows on the linear stability of the solid/liquid interface during the directional solidification of binary alloys. The flows are generated by unidirectional or nonplanar harmonic oscillations of the crystal parallel to the mean interface position, and oscillations with physically realizable amplitudes and frequencies are found to be useful for stabilization purposes. A strongly nonlinear equation which governs the evolution of the interface in the limit of high surface energy, a weak flow and thermodynamic equilibrium is derived, and a weakly nonlinear analysis of this equation is performed. For the unidirectional case, it is found that oscillations with sufficiently large amplitude will change the initial bifurcation from super- to subcritical. For the nonplanar case, it is found that subcritical instability of roll, square and hexagonal cells is favored as the amplitude of the flow is increased. Thus, some of the stabilization due to the flow may be lost at finite amplitude, but substantial stabilization can be retained. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869019
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  • 10
    Electronic Resource
    Electronic Resource
    The free radical reaction between alkanes and carbon tetrachloride (1985)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 107 (1985), S. 4721-4724 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00302a020
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