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  • 1
    Electronic Resource
    Electronic Resource
    Auger electron spectroscopy of molecules: Theory for spin polarization following photoabsorption (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 236-244 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this article we derive an expression for the angular distribution of spin-detected electrons emitted in the Auger decay of a vacancy created by photoabsorption in a molecule belonging to one of the 32 point groups. The geometrical factor in the final expression is identical to the one recently obtained by us for angle- and spin-resolved photoelectron spectroscopy of freely rotating, unpolarized polyatomics by using a modified definition of the angular momentum transferred from the ionizing radiation to the outgoing electron. The "reduced'' amplitude in the present case contains, of course, both the Auger decay and photoionization matrix elements. The results derived herein, therefore, mean that identical geometrical analysis is applicable to spin-resolved Auger electron as well as photoelectron spectroscopies of molecules. We, in particular, show that the degree of spin-polarization of Auger electrons emitted following photoabsorption in C∞v and D∞h linear molecules can be completely characterized by four independent parameters. The procedure developed herein is used to predict those molecular vacancies whose Auger decay will give rise to anisotropic angular distribution provided spin of the ejected electron is also observed. The degree of spin polarization of Auger electrons in this case is completely determined by a single parameter, say αa, and does not depend upon the state of polarization of the absorbed photon. In the end, αa is predicted for some of the possible Auger transitions which may follow photoionization in 2a1 orbital of CCl4, SiCl4, and GeCl4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463621
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  • 2
    Electronic Resource
    Electronic Resource
    Photoelectron spectroscopic studies of polyatomic molecules: Degree of orientation and ionization of rotationally state selected, oriented molecules (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 6382-6399 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this paper we report theoretical studies of angle-resolved photoelectron spectroscopy (ARPES) and of circular dichroism in photoelectron angular distribution (CDAD) for ionization in molecules oriented in a single ||JKJMJ〉 rotational eigenstate. These processes have been investigated also as two of the possible alternatives to photodissociation to determine orientational distribution function of rotationally state selected, oriented molecules. Expressions are derived which can be used to calculate ARPES and CDAD for such molecular species from ab initio methods or to analyze these experimentally observed spectra for extracting information about the degree of orientation of the molecular framework. These formulas are put in their simplest possible forms using the transformation properties of the molecular point group to their full advantage. The ionization amplitude is thus shown to decompose into a sum of transitions each involving the final state wave function belonging to an irreducible representation of the point group of the target molecule. It is found that, similar to the case of photodissociation, one can determine the rotational quantum number J purely from experimental photoionization data.Expressions developed herein are used to study ARPES and CDAD for ionization in a1 orbital of those rotationally state selected and oriented spherical top molecules which transform according to the Td point symmetry group. In this case, the detection-integrated cross section, singly differential in molecular orientation, is found to be independent of the photoionization dynamics and directly gives the molecular orientational function. The other ARPES and CDAD formulas are shown to depend upon the dynamics through the integrated partial cross section σ¯, the angularly asymmetry parameter β¯, the phase shift of the continuum waves representing the photoelectron, and the phase of the dipole transition amplitudes. The formulation presented in this paper sets a methodology for the analysis of measurements and calculation of the photoelectron spectra in rotationally state selected and oriented molecules in general, spherical top Td molecules in particular. It is applied, as an example, to photoionization in 6a21 orbital of oriented CCl4 in a pure ||JKJMJ〉 rotational state. We find, among other things, that the photoelectron angular distributions change significantly when either or both of the directions of molecular orientation and of polarization of ionizing radiation vary from parallel to perpendicular to the quantization axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461559
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  • 3
    Electronic Resource
    Electronic Resource
    Response to "Comment on ‘Effect of flow profile on low frequency drift-type waves in a dusty plasma' " [Phys. Plasmas 9, 1481 (2002)] (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 1483-1483 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The objections of Vranejes et al. are unfounded and are shown to be based on the complete misunderstanding of our manuscript by the authors. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1447918
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of flow profile on low frequency drift-type waves in a dusty plasma (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 3150-3153 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A nonlocal theory has been developed to study the effect of a flow profile on the stability of low frequency drift-type instability in an inhomogeneous, dusty plasma. The representative experimental values for the plasma parameters show that, due to the presence of dust particles, the well-known stability of the drift wave in a sheared slab geometry does not hold. However, a radially varying transverse (to the equilibrium magnetic field) velocity field is found to play a key role in stabilizing this instability. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1359745
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  • 5
    Electronic Resource
    Electronic Resource
    Auger electron spectroscopy of molecules: Theory for angular and spin correlations with photoelectrons (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 7314-7330 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper introduces a theory to interpret future experiments to simultaneously observe angular distribution of spin-resolved Auger and photoelectrons from a molecule belonging to one of the 32 point groups. The Auger electrons are emitted in the decay of the vacancy created by photoionization. We show that the desired correlation can be completely characterized by 12 parameters which are coefficients of trigonometric functions of the spherical angles of spin quantization directions of two outgoing electrons. The expressions for the parameters themselves, although reduced to the simplest possible forms by using the symmetry properties of the molecular point group to maximum advantage, depend upon bipolar harmonics involving the propagation directions of the Auger and photoelectrons. The angular and spin correlation function thus obtained is completely general and can be readily specialized to any experimental geometry used to observe the ejected electrons. In particular, it is found that for a linear experimental arrangement with spins oriented longitudinally to the respective propagation vectors of the two electrons moving out in opposite directions, the parameters become geometry independent with their number reducing to three, which are now coefficients of the first three Legendre polynomials. Correlation between the spin-quantization directions of Auger and photoelectrons is, on the other hand, described by six parameters which do not depend upon the experimental arrangement. Directional correlation between the two outgoing electrons has also been studied without observing their spins. These angular and/or spin correlation functions are shown to take particularly simpler forms for Auger and photoelectrons emitted from linear molecules. We have applied the procedures developed in this paper to study directional correlation between photoelectrons from 2a1 orbital in a Td molecule and the Auger electrons emitted in the decay of the consequent vacancy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465713
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  • 6
    Electronic Resource
    Electronic Resource
    Nonlocal theory of drift type waves in a collisional dusty plasma (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 1514-1517 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A nonlocal theory of low-frequency drift-type waves has been developed in a magnetized collisional dusty plasma in a sheared slab geometry. It is shown that the well-known stability of the drift waves in a sheared slab geometry does not hold in the presence of dust particles and a new unstable mode exists for typical laboratory plasma parameters. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1329652
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  • 7
    Electronic Resource
    Electronic Resource
    An experiment to measure the equilibrium charge of dust particles embedded in a plasma (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 5263-5266 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The average equilibrium charge of submicron sized silver particles, collected during a finite time of transit through a magnetically confined plasma is reported. The fine, almost spherical particles with uniform size are produced in an evaporation chamber. The average charge of the particles was found to be about 1.4×102 electronic charges. This result is compared with theoretical predictions. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1326061
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  • 8
    Electronic Resource
    Electronic Resource
    IN VITRO HYDROGEN ION BINDING BY CEREALS (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 42 (1977), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The comparatively higher incidence of duodenal ulcer in the rice eating belts of Eastern and Southern India than in the wheat eating population of North-West India has initiated this study of the in vitro H+ ion binding capacities of six commonly used food items, namely, bran, Bengal gram, whole wheat flour, white flour, rice and ‘chira’ (rice brand). Both cooked and uncooked materials caused reduction in acidity, the former, in some cases, being comparatively more efficient than the latter. The general order of efficiency of the food items is bran 〉 Bengal gram 〉 whole wheat flour 〉 white flour 〉 ‘chira’ 〉 rice. The uncooked states of the last three items are not effective.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1977.tb08457.x
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  • 9
    Electronic Resource
    Electronic Resource
    Bay K8644 like activity of an antibody against a 60 kDa tubular membrane protein
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 984 (1989), S. 104-108 
    Details
    ISSN: 0005-2736
    Keywords: (Heart cell beating) ; Antibody ; Calcium ion channel ; Nifedipine ; Protein, 60 kDa ; Tubulin, T-
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0005-2736(89)90348-9
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  • 10
    Electronic Resource
    Electronic Resource
    Unitary group decomposition of hamiltonian operators. II. SU (4) irreducible tensors, norms and their energy variation and symmetry breaking
    Amsterdam : Elsevier
    Annals of Physics 127 (1980), S. 413-435 
    Details
    ISSN: 0003-4916
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0003-4916(80)90104-9
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