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  • 1
    Digitale Medien
    Digitale Medien
    Excited rovibronic level dependence of the magnetic quenching of slow fluorescence of pyrazine vapor (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 4477-4484 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Excited rotational level dependence of the external magnetic field effects both on intensity and on decay of fluorescence of pyrazine vapor has been carefully examined for the zero-point vibrational level in S1 with a field strength of 0–170 G. The magnetic quenching of the slow fluorescence becomes more effective with increasing rotational quantum number J' of the excited level, and the field strength at which the amount of fluorescence quenching becomes one-half of the total amount of quenching at the saturated fields is roughly proportional to (2J'+1)−1. The magnetic quenching is also found to depend on K' of the excited level. The rotational level dependence of the magnetic quenching of the slow fluorescence is related to a difference in the number of the triplet levels coupled to the optically excited singlet rovibronic level, based on the spin decoupling mechanism of the singlet–triplet mixed level.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.456785
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  • 2
    Digitale Medien
    Digitale Medien
    Magnetic field effects on yields and decays of fluorescence of pyrimidine vapor: Excited rovibronic level dependence (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 4197-4203 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: External magnetic field effects on yields and decays of fluorescence of pyrimidine vapor on excitation into various rotational levels belonging to the vibrationless level or the 6a1 level of S1 have been studied in a supersonic jet or in a bulk gas at room temperature with a field strength of 0–150 G. The fast component of fluorescence is not affected by an external magnetic field, whereas the slow fluorescence is quenched by a field except for excitation at the R(0) line belonging to the 0–0 transition. The fluorescence quenching is more effective at the 6a1 level than that at 00, indicating that the level density of the triplet state coupled to the singlet state plays an important role in the magnetic mixing of the triplet spin sublevels, in terms of which the fluorescence quenching by a magnetic field is interpreted. The excited rotational level dependence of the fluorescence quenching by a magnetic field is attributed to K scrambling in the triplet manifold following intersystem crossing.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.453827
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  • 3
    Digitale Medien
    Digitale Medien
    Pathologic inversion of core orbitals in approximate Hartree–Fock calculations (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 7313-7316 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The common sense in quantum chemistry that each bonding orbital is filled before the corresponding antibonding orbital is shown to be often violated for the core orbitals of diatomic systems in approximate Hartree–Fock calculations. Through theoretical analysis of the core orbital energies and numerical analysis of some specific diatomic systems, the origin of this pathologic ordering is suggested to be unusual mixing of valence orbitals into core orbitals induced by the use of basis sets with unbalanced core–valence quality.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.456210
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  • 4
    Digitale Medien
    Digitale Medien
    A dynamical formalism of singular Lagrangian system with higher derivatives (1989)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 30 (1989), S. 1122-1132 
    Details
    ISSN: 1089-7658
    Quelle: AIP Digital Archive
    Thema: Mathematik , Physik
    Notizen: The singular Lagrangian system with higher derivatives is analyzed with the aid of the Ostrogradski transformation and the Dirac formalism. The formulation of canonical theory is developed so that the equivalence between the Lagrange formalism and the Hamilton one is maintained. As a practical example, the acceleration-dependent potentials appearing in the Lagrangian of two-point particles interacting gravitationally are dealt with and the equivalence between the two Hamiltonians that follow from the two Lagrangians which are related by the coordinate transformations is shown. It is also shown, when the constraints are all first class, that a consistent generator of gauge transformation is constructed. Typical examples are given.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.528331
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  • 5
    Digitale Medien
    Digitale Medien
    Domain observation during direct overwrite on magneto-optical recording films (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 315-317 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Domain patterns were observed with a polarized microscope during direct thermomagnetic overwrite at a fixed bias magnetic field. The size of a recorded domain can be changed reversibly by irradiation of laser pulses with various durations. By scanning a rapidly pulsed laser beam on a film, a stripe domain can be written, erased, and manipulated. This technique may be used in a new type of rewritable memory device. These overwrite behaviors can be explained with a model which assumes that an initial domain formed during laser pulse heating shrinks during cooling.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.102414
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  • 6
    Digitale Medien
    Digitale Medien
    Ultrafast switching characteristics of a bistable surface-emitting multiple quantum well distributed Bragg reflector laser (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 942-944 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We describe an ultrafast switching operation of a bistable surface-emitting distributed Bragg reflector laser. The rise time was as small as 12 ps and the fall time was 90 ps. Both are much smaller than those of conventional bistable laser diodes. Ths was realized by the effect of the multiple quantum well structure and a strong detuning.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.99235
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  • 7
    Digitale Medien
    Digitale Medien
    Thermally stimulated resonant current in AlGaAs/GaAs triple barrier diodes (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 445-447 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Thermally stimulated resonant current peaks are observed in Al0.4Ga0.6As/GaAs triple barrier diodes. These current peaks are interpreted as resonant tunnelings from the first excited electron subband in the first well to the first excited subband and to the second excited subband in the second well. The activation energies for these resonance peaks are measured. The results imply that in the substrate-side well there is a large amount of excess electrons to compensate the positive charge of silicon atoms segregated into the structure during the growth.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.98417
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  • 8
    Digitale Medien
    Digitale Medien
    Measurements of the polarization dependence of field-induced refractive index changes in GaAs/AlAs multiple quantum well structures (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 86-88 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The measurements of the polarization dependence of field-induced refractive index changes in GaAs/AlAs multiple quantum wells, which are directly measured by using the modulation spectroscopy method for the TE and TM modes, are described. Clear polarization dependences, such as differences in the spectra shape and the peak wavelength, were observed. The polarization dependences originate from the different excitonic transitions: the n=1 heavy-hole and light-hole exciton for the TE mode and the n=1 light-hole exciton for the TM mode. The experimental results show qualitatively good agreement with the theoretical calculation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.100356
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  • 9
    Digitale Medien
    Digitale Medien
    Interaction between radiation-induced defects and the Pt-related center in silicon (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 2206-2207 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The interaction of Pt with electron irradiation induced defects has been observed. Platinum in silicon increases irradiation-induced defects remarkably, especially of the A center, and lowers the annealing temperature to 220–140 °C for the A and E centers, respectively. The level Ea (0.23) in the Pt-doped silicon is the Pt(−/0) level, an acceptor like the A center.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.98941
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  • 10
    Digitale Medien
    Digitale Medien
    Capture of photoexcited carriers by a laser structure (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 2646-2648 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The capture of photoexcited carriers in different laser structures is investigated by subpicosecond luminescence spectroscopy. The capture time at 20 and 80 K is monitored by the decay of the luminescence of the confinement layers. It is found to range between 2 and 3 ps for both linear and parabolic grading, and to be much longer in nongraded structures. The improvement of the capture in the case of graded structures is due to the quasi-electric field experienced by the carriers, and might allow the devices to run at much higher frequencies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.101962
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