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  • Blackwell Publishing Ltd  (16)
  • American Institute of Physics (AIP)  (7)
  • 1990-1994  (17)
  • 1975-1979  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Localized chaos and partial assignability of dynamical constants of motion in the transition to molecular chaos (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 7196-7204 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The implications of approximate dynamical constants of motion for statistical analysis of highly excited vibrational spectra are investigated. The existence of approximate dynamical constants is related to localized chaos and partial assignability of a "chaotic spectrum.'' Approximate dynamical constants are discussed in a dynamical symmetry breaking formulation of the transition from periodic to quasiperiodic motion, and from quasiperiodic to chaotic motion. Level repulsion, leading to a Wigner distribution in the case of a strongly chaotic system, is shown to originate in dynamical symmetry breaking via the noncrossing rule that states of the same symmetry do not cross. It is argued that quantum numbers for dynamical constants must be correctly assigned to detect localized chaos in statistical spectroscopy. Two possible kinds of approximate constants, for a "total polyad number'' and a bend normal mode, are discussed in relation to two coupling schemes that could govern the transition to chaos in H2O.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458207
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  • 2
    Electronic Resource
    Electronic Resource
    Classical atom–diatom scattering: Self-similarity, scaling laws, and renormalization (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 2765-2780 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have examined the structure of the chattering region of the initial angle–final action plots of He scattered by I2. We demonstrate the existence of asymptotic self-similarity, determine the asymptotic scaling laws, and outline a renormalization treatment of the structures observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465185
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  • 3
    Electronic Resource
    Electronic Resource
    The correspondence between classical nonlinear resonances and quantum mechanical Fermi resonances (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 2495-2505 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The correspondence between classical nonlinear resonances and quantum mechanical Fermi resonances is discussed. The principle result is the recognition that the classical resonant behavior does not contribute to the diagonal matrix elements, but rather contributes to the off-diagonal matrix elements. As a direct consequence, it is not necessary for the classical dynamics corresponding to the quantum mechanical states involved in a Fermi resonance to exhibit resonant behavior. Instead, it is the classical dynamics associated with the matrix element which connects the quantum mechanical states involved in the Fermi resonance which must exhibit resonant behavior. These results are illustrated numerically using a very simple model of two kinetically coupled Morse oscillators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465212
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  • 4
    Electronic Resource
    Electronic Resource
    Stabilizing a laser beam's focal point inside a liquid-helium cryostat (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 325-330 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The focal point of a laser beam inside a liquid-helium cryostat has been spatially stabilized. Both passive and active stabilization techniques are employed. The position of the focal point is maintained to submicrometer dimensions in the plane transverse to the beam path. The instabilities along the beam propagation direction are reduced to the order of 10 μm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144456
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  • 5
    Electronic Resource
    Electronic Resource
    Phase-locked optical choppers (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 342-345 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed a circuit for maintaining a fixed phase relationship between two optical choppers. The basis of this circuit employs a phase-locked loop using both proportional and integral terms in the feedback control voltage. Using additional circuitry, the electronics can compensate for drifts in the phase as well as frequency of both choppers in the frequency range from 200 Hz to 3 kHz. These phased optical choppers have been used to block background light simultaneous with a chopped cw laser in experiments that measure long lived fluorescence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144254
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  • 6
    Electronic Resource
    Electronic Resource
    Increasing the frequency stability of single-frequency lasers (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2475-2481 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed an improved technique to increase the stability of single-frequency lasers by employing a scanning Fabry–Perot interferometer and a stabilized helium neon laser. Our instrument surpasses earlier devices in several key areas. The laser frequency can now be stabilized while scanned across its inherent single-frequency tuning range. The frequency stability is long term with an increased frequency correction rate of nearly 500 Hz. The laser frequency can be scanned repeatedly with a repetition accuracy equal to the frequency stability. Also, the electronics permit the laser frequency to be swept externally while synchronized with other instruments. Our stabilizer reduced the frequency drift of a commercial ring dye laser to ±1 MHz relative to the reference laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143906
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  • 7
    Electronic Resource
    Electronic Resource
    Classical S-matrix theory for chaotic atom–diatom collisions (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 10393-10403 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The extension of classical S-matrix theory to chaotic scattering systems is considered. It is shown that if the fractal structure of the chattering region is understood then the contribution to the S-matrix elements and the transition probabilities can be expressed as a sum over the infinite number of contributing trajectories and that by using the scaling laws of the fractal that this sum can be evaluated. It is shown that if the transition is classically forbidden then the contribution from the chattering region is significant. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467920
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  • 8
    Electronic Resource
    Electronic Resource
    Comments on “Public Perception of Hazardous Waste” (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Risk analysis 11 (1991), S. 0 
    Details
    ISSN: 1539-6924
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1539-6924.1991.tb00569.x
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  • 9
    Electronic Resource
    Electronic Resource
    Calcium Imaging in Hippocampal Neurons using Confocal Microscopy (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 747 (1994), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1994.tb44419.x
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  • 10
    Electronic Resource
    Electronic Resource
    Direct Gene Transfer for the Understanding and Treatment of Human Disease (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 716 (1994), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1994.tb21709.x
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