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  • 1
    Electronic Resource
    Electronic Resource
    Blade coating of a power-law fluid (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 11 (1999), S. 958-970 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper we re-examine the problem of applying a thin layer of a power-law fluid to a solid substrate by means of a simple blade coater. Specifically we use lubrication theory to examine steady plane flow of a power-law fluid in the narrow nonuniform channel formed between a fixed blade of prescribed shape and a plane substrate moving parallel to itself. The first-order asymptotic solution for the case of a weakly non-Newtonian fluid is presented. An explicit expression is obtained for the first-order pressure gradient from which the first-order contributions to several important physical quantities including the thickness of the applied fluid layer and the forces on the blade are calculated for both plane and exponentially shaped blades. In particular, we find that, depending on the shape and height ratio of the coater, the effect of weakly non-Newtonian behavior can be either to increase or to decrease both the pressure and the load from their Newtonian values. We also re-examine the approximate solutions of Hwang [Trans. ASME J. Fluids Eng. 104, 469 (1982)] and Dien and Elrod [Trans. ASME J. Lubrication Technol. 105, 385 (1983)] and make a detailed comparison between their predictions and those of the exact solution in the weakly non-Newtonian limit. We find that in this limit the Dien and Elrod approximation is usually in significantly better agreement with the exact solution than Hwang's approximation. In the Appendix we re-examine the Dien and Elrod approximate solution for the flow of a generalized Newtonian fluid. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869968
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  • 2
    Electronic Resource
    Electronic Resource
    Fourier transform diagnostics of gaseous species during microwave assisted diamond deposition (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 134-136 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High resolution Fourier transform spectra of the microwave plasma used for diamond deposition has been obtained in the 3 μm range. The results show that methane is nearly totally dissociated in the plasma. The recombination of the products of dissociation gives mostly acetylene and methane which have been detected 20 cm downstream.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109349
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  • 3
    Electronic Resource
    Electronic Resource
    Permanent sextupole magnets for polarized Stern–Gerlach-type atomic beam sources : Proceeding of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2634-2635 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Design and performance of high field permanent sextupole magnets, appropriate for the use in Stern–Gerlach-type atomic beam sources, is described. With neodymium–iron–boron alloys as permanent magnetic material, a usable pole tip field of 1.44 T has been obtained at a diameter of 24.5 mm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142862
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  • 4
    Electronic Resource
    Electronic Resource
    The electronic transition dipole moment of the B0+u→X0+g transition in iodine (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 8780-8783 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The electronic transition dipole moment of the B0+u→X0+g transition in molecular iodine has been determined in the range 2.633≤Rcentroid≤6.035 A(ring). We have measured a decrease of ||μ¯e||2 of about 4 orders of magnitude, perhaps the largest variation of ||μ¯e||2 yet observed in a molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466732
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  • 5
    Electronic Resource
    Electronic Resource
    Resonance enhanced multiphoton ionization spectroscopy of carbon disulphide (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 6117-6129 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Rydberg excited states of the CS2 molecule in the energy range 56 000–81 000 cm−1 have been further investigated via the two and three photon resonance enhancements they provide in the mass resolved multiphoton ionization (MPI) spectrum of a jet-cooled sample of the parent molecule. Spectral interpretation has been aided by parallel measurements of the kinetic energies of the photoelectrons that accompany the various MPI resonances. Thus we have been able to extend, and clarify, previous analyses of the tangled spin–orbit split vibronic structure associated with the 3Πu and 1Πu states derived from the configuration [2Πg]4pσu and the 3Δu, 1Δu, and 1Σ+u states resulting from the configuration [2Πg]4pπu, and to deduce an approximate wave number for the origin of the hitherto unidentified 3Σ+u state derived from this same configuration. Moving to higher energies we are able to locate, unambiguously, the origins of the next (n=5) members of four of these [2Πg]np Rydberg series, and to identify extensive series based on the presumed Rydberg configurations [2Πg]nsσg and [2Πg]nfλu with, in both cases, n≤10. We also identify MPI resonances attributable to CS(a 3Π) fragments, to ground state C atoms, and to S atoms in both their ground (3P) and excited (1S) electronic states. Analysis of the former resonances indicates that the CS(a 3Π) fragments resulting from two photon dissociation of CS2 at excitation wavelengths around 300 nm are formed with substantial rovibrational excitation. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471277
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  • 6
    Electronic Resource
    Electronic Resource
    Resonance enhanced multiphoton ionization spectroscopy of carbonyl sulphide (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 2141-2152 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Rydberg excited states of the OCS molecule in the energy range 70500–86000 cm−1 have been investigated via the two and three photon resonance enhancements they provide in the mass resolved multiphoton ionization (MPI) spectrum of a jet-cooled sample of the parent molecule. Spectral interpretation has been assisted by companion measurements of the kinetic energies of the photoelectrons that accompany the various MPI resonances. The present study supports the earlier conclusions of Weinkauf and Boesl [J. Chem. Phys. 98, 4459 (1993)] regarding five Rydberg origins in the 70500–73000 cm−1 energy range, attributable to, respectively, states of 3Π, 1Π, 3Δ, 1Δ and 1Σ+ symmetry arising from the 4pλ←3π orbital promotion. We also identify a further 21 Rydberg origins at higher energies. These partition into clumps with quantum defects ca. 3.5 and 4.5, which we associate with the orbital promotions npλ←3π (n=5,6), and others with near integer quantum defect which are interpretable in terms of excitation to s,d and (possibly) f Rydberg orbitals. We also identify MPI resonances attributable to CO(X 1Σ+) fragments and to S atoms in both their ground (3P) and excited (1D) electronic states. Analysis of the former resonances confirms that the CO(X) fragments resulting from one photon dissociation of OCS at excitation wavelengths ca. 230 nm are formed with a highly inverted, bimodal rotational state population distribution, whilst the latter are consistent with previous reports of the wavelength dependence for forming ground and excited state S atoms in the near uv photolysis of OCS. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472088
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  • 7
    Electronic Resource
    Electronic Resource
    The (1)1Πg state of 39K2 revisited (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 2717-2726 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vibrational levels up to v=107 of the (1)1Πg state of 39K2, which dissociates to K(4s)2S1/2+K(4p)2P3/2, have been observed in high-resolution Fourier transform records of C 1Πu→(1)1Πg fluorescence. From a revised analysis of this system, we have constructed a rotationless Rydberg–Klein–Rees (RKR) potential curve which extends to R=40.3 Å. Vibrational and rotational constants have been calculated from this curve. The parameters describing the Coulombic interactions between K(4s)+K(4p) atoms are given in a Hund's case (c) basis. From this work, the dissociation energy De for the (1)1Πg state is found to be 1290.30±0.02 cm−1, leading to a new value of Te=16 203.25±0.09 cm−1 for this state. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476870
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  • 8
    Electronic Resource
    Electronic Resource
    The spectroscopy of high Rydberg states of ammonia (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 6667-6680 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper extends our knowledge of the higher excited states of the ammonia molecule by presenting detailed measurements of the 2+1 resonance enhanced multiphoton ionization (REMPI) spectrum of both NH3 and ND3 obtained following excitation in the wavelength range 298–242 nm, i.e., at energies up to the first ionization energy. Complementary analyses of the wavelength resolved REMPI spectrum and the accompanying REMPI-photoelectron spectra leads to the identification of ten new Rydberg origins of NH3 (four for ND3) with principal quantum numbers n≤8 and, in most cases, of the accompanying out-of-plane bending vibrational progression. Symmetry assignments for the various newly identified excited states are offered, based on band contour simulation and/or quantum defect considerations. Dominant amongst these are the E˜″ 1A2″ (5sa1′←1a2″) state: ν0=74 118(2) cm−1 [NH3], ν0=74 258(2) cm−1 [ND3], the F˜″ 1E″ (5pe′←1a2″) state: ν0=76 220(50) cm−1 [NH3], ν0=76 240(50) cm−1 [ND3], the F˜′ 1A1′ (5pa2″←1a2″) state: ν0=76 674(1) cm−1 [NH3], ν0=76 770(5) cm−1 [ND3], and the G˜′ 1A1′ (6pa2″←1a2″) state: ν0=78 494(1) cm−1 [NH3]. The present work serves to reinforce the previously noted dominance of np←1a2″ Rydberg excitations in the 2+1 REMPI spectrum of ammonia. In addition, the adiabatic ionization energy of ND3 is estimated to be 82 280±40 cm−1 based on the assumption that analogous Rydberg states of NH3 and ND3 will have very similar quantum defects. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476082
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  • 9
    Electronic Resource
    Electronic Resource
    On the gravity-driven draining of a rivulet of a viscoplastic material down a slowly varying substrate (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 14 (2002), S. 555-571 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We use the lubrication approximation to investigate the steady locally unidirectional gravity-driven draining of a thin rivulet of viscoplastic material, modeled as a biviscosity fluid (or, as a special case, as a Bingham material), down a slowly varying substrate. In contrast to the earlier work on viscoplastic rivulets we consider small-scale flows, such as those found in many industrial coating and printing processes, in which surface-tension effects play a significant role. We interpret our results as describing a slowly varying rivulet draining in the azimuthal direction from the top to the bottom of a large horizontal circular cylinder. Provided that the yield stress is nonzero we find that the flow is always unyielded near the top of the cylinder (where the rivulet becomes infinitely wide in the transverse direction), and, except in the special case when the viscosity ratio is zero, near the bottom of the cylinder (where it becomes infinitely deep). For sufficiently small values of the prescribed volume flux the flow is unyielded everywhere, but for larger values of the flux the flow near the substrate in the center of the rivulet is yielded. We obtain numerically calculated values of the semiwidth of the rivulet and of the yielded region as well as of the maximum height of the rivulet and of the yielded region for a range of parameter values, and describe the asymptotic behavior of the solution in the limits of large and small yield stress, large and small flux, and small viscosity ratio. In the special case of a Bingham material the flow near the top of the cylinder consists of an infinitely wide rigid and stationary plug, while elsewhere it consists of two rigid and stationary "levées" at the edges of the rivulet and a central region in which the flow near the free surface is a "pseudoplug" whose velocity does not vary normally to the substrate, separated from the "fully plastic" flow near the substrate by a "pseudoyield surface." © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1416882
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  • 10
    Electronic Resource
    Electronic Resource
    New elastic electron scattering factors for the elements for incident energies of 10, 40, 60, and 90 keV (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 6810-6811 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An improved set of scattering factors for all neutral elements has bee completed for inclusion in the new edition of the International Tables of X−ray Crystallography . These calculations are compared with the former electron scattering factors and the deviations between the two are discussed.(AIP)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451417
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