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  • 1
    Electronic Resource
    Electronic Resource
    The interaction of an obliquely incidents-polarized plane electromagnetic wave at a warm moving magnetized plasma half-space (1975)
    Springer
    Astrophysics and space science 33 (1975), S. 147-163 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The interaction of ans-polarized plane electromagnetic wave incident from a dielectric (or vacuum) region on awarm moving magnetized plasma half-space is considered. The external magnetic field is assumed to be normal to the direction of the wave normal and the velocity of the moving medium. Using the first three moment equations, together with Maxwell's electromagnetic equations, we construct the constitutive relations in the rest frame of the moving medium. The constitutive relations are then transformed to the laboratory frame by invokingMinkowski's equations for the moving plasma medium, and the dispersion relation for the propagating ordinary mode in the moving medium is derived. Expressions are obtained for the phase and group velocities and the index of refraction for the ordinary mode, as also for power reflection and transmission coefficients. It is found that in contrast to the case of a cold magnetized plasma, the ordinary electromagnetic mode excited in the warm magnetoplasma medium getsmodified due to the presence of an external magnetic field. In addition, the various reflection and transmission characteristics for a warm magnetoplasma depend on the velocity of the moving plasma as well as on the strength of the applied magnetic field, as against the case for a cold moving magnetized plasma. Numerical results on the reflection coefficient are presented for several values of the parameters characterizing the electron-plasma temperature, the velocity of the moving medium and the strength of the applied magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646015
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  • 2
    Electronic Resource
    Electronic Resource
    The interaction of an obliquely incident plane electromagnetic wave with an anisotropic moving conducting half-space (1976)
    Springer
    Astrophysics and space science 39 (1976), S. 213-234 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The interaction of an obliquely incident plane electromagnetic wave with an anisotropic moving conducting medium described by tensor constitutive parameters $$(\mathop \varepsilon \limits^ \leftrightarrow , \mathop {\mu ,}\limits^ \leftrightarrow and \mathop \sigma \limits^ \leftrightarrow )$$ is studied. Starting from the Maxwell-Minkowski equations the wave solutions in the laboratory frame, the modified law of refraction and the reflecton and the transmission coefficients are obtained both for incidentE- andH-waves, corresponding to the two specific orientations of the plane of incidence relative to the direction of motion of the medium. The reflection and the transmission coefficients for a moving conducting medium do not, in general, add to unity resulting in the possibility of energy transference between the moving medium and the transmitted wave. Further the various reflection and transmission characteristics are modified in an interesting manner due to the finite conductivity, the anisotropy and the motion of the medium. Numerical results for the reflection and the transmission coefficients are presented for a range of the parameters characterizing the anisotropy and the velocity of the moving medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00640522
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  • 3
    Electronic Resource
    Electronic Resource
    Electromagnetic radiation from line sources interacting with a moving uniaxial dielectric or plasma half-space (1979)
    Springer
    Astrophysics and space science 63 (1979), S. 405-417 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The problem of electromagnetic radiation from electric and magnetic line sources interacting with a moving uniaxially anisotropic dielectric or plasma half-space is treated. The anisotropy of the plasma is due to an infinitely strong magnetizing field impressedparallel to the motion of plasma. The line source is oriented normal to the direction of medium motion. TheE and theH modes are excited independently in the medium by the magnetic and the electric line sources, respectively. Invoking the saddle-point method of integration, the far-zone radiation field and the radiation pattern are obtained for both line sources. It is found that the radiation from an electric line source is not affected by the anisotropy of the moving medium and that a magnetic line source invacuum has finite components of radiation in directions which are parallel and antiparallel to the direction of motion, for the case of a uniaxial plasma in contrast to the results for a uniaxial dielectric. Numerical results for the far-zone radiation pattern, referring to a magnetic line source, are presented for several values of parameters characterizing the non-dimensional velocity, the anisotropy of the medium, the electron-plasma density and the location of the line source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00638911
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  • 4
    Electronic Resource
    Electronic Resource
    Electromagnetic radiation from line sources interacting with a moving magnetoplasma slab backed by a finitely conducting medium (1980)
    Springer
    Astrophysics and space science 67 (1980), S. 445-459 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The problem of electromagnetic radiation from electric and magnetic line sources interacting with a moving magnetoplasma slab backed by a finitely conducting medium is treated. The local magnetostatic field is aligned parallel with the line source and is perpendicular to the direction of slab motion. For the configuration, theE andH modes are excited independently by a magnetic and an electric line source respectively. Expressions for the far zone radiation fields and the radiation pattern have been obtained for both the line sources. It is found that the radiation due to an electric line source is not affected by the presence of a static magnetic field and the motion of the slab medium. Numerical results for the radiation pattern referring to both the line sources have been presented for a wide range of parameters characterizing the finite magnetostatic field, the conductivity of the medium backing the plasma, the thickness of the slab and the location of the line source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642397
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  • 5
    Electronic Resource
    Electronic Resource
    Calculation of rydberg states of lithium isoelectronic sequence (1986)
    Springer
    Theoretical chemistry accounts 69 (1986), S. 51-62 
    Details
    ISSN: 1432-2234
    Keywords: Rydberg states ; Atomic wavefunctions ; Lithium atom
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The transition energies and singly excited P, D and F states of Li, Be+ and B2+ for the Rydberg levels 1s 22s: 2 S→1s 2 nl: 2L (n=5, 6,...9) have been calculated using time dependent coupled Hartree-Fock (TDCHF) theory. Within single particle model the theory includes RPA type correlations and furnishes reasonable description of the excited states. The transition energies and oscillator strengths for allowed transitions are in good agreement with the experimental and theoretical values, wherever available. Effective quantum numbers have been estimated for all transitions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00526292
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  • 6
    Electronic Resource
    Electronic Resource
    Static dipole polarizabilities of open-shell negative ions (1992)
    Springer
    Theoretical chemistry accounts 82 (1992), S. 223-227 
    Details
    ISSN: 1432-2234
    Keywords: Static polarizabilities ; Negative ions ; Open shell systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Dipole polarizability estimates at λ ⇒ ∞ have been calculated for the 2p and 3p open-shell negative ions in their ground and valence excited states. To complete the sequence such estimates for F− and Cl− in their ground1 S state have also been made. Single configuration based linear response theory has been adopted presently with a view to study the effect of RPA-type correlations on the polarizabilities of such systems. For the 3p open-shell systems the innermost 1s core has been kept frozen. Most of the results are reported for the first time. Agreement with existing data, wherever available, is reasonable. The convergence of the polarizability estimates towards basis sets has been studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01113254
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  • 7
    Electronic Resource
    Electronic Resource
    Time-dependent Hartree-Fock calculations for the excited ‘S’ states of lithium isoelectronic sequence (1984)
    Springer
    Theoretical chemistry accounts 66 (1984), S. 173-181 
    Details
    ISSN: 1432-2234
    Keywords: RPA calculations ; excited states ; atomic wavefunctions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Time-dependent HF (RPA) calculations have been performed to estimate the transition energies and excited state wavefunctions of Li, Be+, B2+ and C3+ for the transitions 1s 22s∶ 2 S → 1s 2 ns ∶ 2 S (n = 3,4, ... 8). The excitation energies and excited state wavefunctions are extracted from the position of the poles of a linearised variational functional. The excitation energies are in excellent agreement with those obtained spectroscopically. The excited state wavefunctions are utilised to find the matrix elements of different operators and the cusp values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00549667
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  • 8
    Electronic Resource
    Electronic Resource
    Dynamic polarizabilities and Rydberg states of open shell atomic systems (1988)
    Springer
    Theoretical chemistry accounts 74 (1988), S. 431-444 
    Details
    ISSN: 1432-2234
    Keywords: Dynamic polarizabilities ; Rydberg states ; Open shell ions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Time dependent coupled Hartree-Fock (TDCHF) theory is applied to calculate frequency dependent polarizabilities, transition energies, oscillator strengths and effective quantum numbers of several excited states of the open shell ions Al, Si+, P2+, S3+, Cl4+, Ar5+, Cl and Ar+ in the 2P state within and beyond the normal dispersion region. The Roothaan formalism has been adopted to deal with the open shell problem. The excitation energies are extracted from the positions of the poles of an appropriate functional. Analytic representations of the singly excited Rydberg states have been found. The results obtained compare well with spectroscopic and other elaborate theoretical data wherever available. Inner shell excitations have been found for the first time within TDCHF theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00528015
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  • 9
    Electronic Resource
    Electronic Resource
    Singly excited bound states in continuum: a time-dependent perturbation approach (1993)
    Springer
    Theoretical chemistry accounts 85 (1993), S. 371-377 
    Details
    ISSN: 1432-2234
    Keywords: Dynamic polarizabilities ; Transition energies ; Oscillator strengths ; Closed shell negative ions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Time-dependent coupled Hartree-Fock (TDCHF) scheme has been applied to study the behaviour of bound excited states embedded in the continuum for the negative ions Li−, F−, Na− and Cl−. The excited states have been obtained from the position of the poles of the dynamic polarizability values which are evaluated for all the ions within and beyond the normal dispersion region. Transition energies and dipole allowed oscillator strengths have been obtained for several transitions which lie in the continuum. Although the excited state functions are extremely diffuse, they show proper asymptotic behaviour and furnish correct number of nodes. Oscillator strengths are found to follow a different trend than observed in normal bound state calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01113430
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  • 10
    Electronic Resource
    Electronic Resource
    Doubly excited3Se,3De and3Ge states of two-electron atomic systems (1994)
    Springer
    Theoretical chemistry accounts 89 (1994), S. 147-155 
    Details
    ISSN: 1432-2234
    Keywords: Doubly excited states ; Excitation energies ; Effective quantum numbers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Time-dependent perturbation theory has been applied to calculate the doubly excited triplet statesNsns:3Se,Npnp:3De andNdnd:3Ge (N=2, 3, 4,n=N+1, ... ,5) for He, Li+, Be2+ and B3+. A time-dependent harmonic perturbation causes simulataneous excitation of both the electrons with a change of spin state. The doubly excited energy levels have been identified as the poles of an appropriately constructed linearized variational functional with respect to the driving frequency. In addition to the transition energies, effective quantum numbers of these doubly excited states have been calculated and analytic representations of their wave functions are obtained. These are utilized to estimate the Coulomb repulsion term for these states which checks the consistency of the wave functions. These wave functions may also be used for calculating other physical properties of the systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01132798
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