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  • 1
    Digitale Medien
    Digitale Medien
    Selective field ionization of high Rydberg states: Application to zero-kinetic-energy photoelectron spectroscopy (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 5461-5469 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Sequences of pulsed electric fields have been designed and tested that enable a higher selectivity in the pulsed field ionization of high Rydberg states (n≥100) than has so far been possible. The enhanced selectivity originates from the permutation of the parabolic quantum numbers n1 and n2 that is induced by a sufficiently rapid inversion of the electric field polarity during a pulse sequence. A reliable procedure, based on numerical simulations of the outcome of pulse field ionization sequences, has been developed to detect and control changes in the parabolic quantum numbers that can occur during a pulse sequence. The procedure can be used to assess under which conditions a clean permutation of the parabolic quantum numbers can be achieved. Unwanted randomization of m, n1 and n2, which reduces the selectivity of the field ionization process, can be avoided by minimizing the time intervals during which the electric field in the pulse sequence is almost zero. The high selectivity reached in the pulsed field ionization of high Rydberg states has been used to record pulsed-field-ionization zero-kinetic-energy photoelectron spectra of argon and nitrogen at an unprecedented resolution of 0.06 cm−1. This resolution opens new perspectives in photoelectron spectroscopy. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1396856
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  • 2
    Digitale Medien
    Digitale Medien
    Models of the Hofstadter-type (1996)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 37 (1996), S. 5207-5243 
    Details
    ISSN: 1089-7658
    Quelle: AIP Digital Archive
    Thema: Mathematik , Physik
    Notizen: Spectra and eigenfunctions of discrete Hamiltonians are computed using algebraic, analytic, and numerical tools. In particular, we consider the Hofstadter and the Second Neighbor Square Lattice model, the Triangular Lattice model in an inhomogenous magnetic field, the Doubly-discrete Quantum Pendulum, and the Honeycomb model. Qualitative properties of the spectra are related to symmetries. Semiclassical analysis in the algebraic setting for the Doubly-discrete Quantum Pendulum is shown to match numerical results well. The connection to integrable models is mentioned. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.531681
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  • 3
    Digitale Medien
    Digitale Medien
    Discrete time adiabatic theorems for quantum mechanical systems (1998)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 39 (1998), S. 1340-1349 
    Details
    ISSN: 1089-7658
    Quelle: AIP Digital Archive
    Thema: Mathematik , Physik
    Notizen: The theory of adiabatic asymptotics is adapted to systems with discrete time evolution. The corresponding theorems about the approximation of physical time evolution by the adiabatic time evolution are shown to hold true in a discrete setting. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.532382
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  • 4
    Digitale Medien
    Digitale Medien
    Effects of creatine treatment on survival and differentiation of GABA-ergic neurons in cultured striatal tissue (2005)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 95 (2005), S. 0 
    Details
    ISSN: 1471-4159
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Huntington's disease (HD) is an autosomal dominant neurodegenerative disorder, characterized by a prominent loss of GABA-ergic medium-sized spiny neurons in the caudate putamen. There is evidence that impaired energy metabolism contributes to neuronal death in HD. Creatine is an endogenous substrate for creatine kinases and thereby supports cellular ATP levels. This study investigated the effects of creatine supplementation (5 mm) on cell survival and neuronal differentiation in striatal cultures. Chronic creatine treatment resulted in significant increased densities of GABA-immunoreactive (-ir) neurons, although total neuronal cell number and general viability were not affected. Similar effects were seen after short-term treatment, suggesting that creatine acted as a differentiation factor. Inhibitors of transcription or translation did not abolish the creatine-mediated effects, nor did omission of extracellular calcium, whereas inhibition of mitogen-activated protein kinase and phosphatidylinositol-3-kinase significantly attenuated the creatine induced increase in GABA-ir cell densities. Creatine exhibited significant neuroprotection against toxicity instigated either by glucose- and serum deprivation or addition of 3-nitropropionic acid. In sum, the neuroprotective properties in combination with promotion of neuronal differentiation suggest that creatine has potential as a therapeutic drug in the treatment of neurodegenerative diseases, like HD.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1471-4159.2005.03337.x
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  • 5
    Digitale Medien
    Digitale Medien
    Measurement of the hyperfine structure in low-l, high-n Rydberg states of ortho H2 by millimeter wave spectroscopy (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 7939-7944 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Millimeter wave spectroscopy has been used to record high-resolution spectra of high-n (n=51–64), low-l (l=1–3) Rydberg states of ortho H2 located below the N+=1 rotational level of the X 2Σg+(v+=0) ground vibronic state of H2+. The spectral resolution of better than 1 MHz enables the observation of the hyperfine structure in these spectra. A simple procedure, based on the determination of combination differences, is used to reconstruct the energy level structure in np, nd, and nf Rydberg states of H2. The Stark effect is used to distinguish experimentally between p and f Rydberg states. In the weakly penetrating nf series, the hyperfine interaction dominates and the observed hyperfine components are of mixed singlet (S=0) and triplet (S=1) character. In the penetrating np series, the dominant interactions are between the electron orbital and spin angular momenta and the molecular rotation and the observed hyperfine components are characterized by a well-defined total electron spin. The nd Rydberg states show a behavior intermediate between these two limiting cases. The observed levels are of mixed singlet (S=0) and triplet (S=1) character but the main energy separation departs from the energy separation between the Gc=1/2 and Gc=3/2 levels of the H2+ ion. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1315608
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  • 6
    Digitale Medien
    Digitale Medien
    Spectrophotometric analyses of hydroxysteroid dehydrogenase activity in presumed steroid-producing tissues of the brook lamprey (Lampetra planeri Bloch) in different developmental stages
    Amsterdam : Elsevier
    General and Comparative Endocrinology 51 (1983), S. 353-363 
    Details
    ISSN: 0016-6480
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1016/0016-6480(83)90050-3
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  • 7
    Digitale Medien
    Digitale Medien
    On the quantum Hall effect
    Amsterdam : Elsevier
    Journal of Geometry and Physics 1 (1984), S. 13-23 
    Details
    ISSN: 0393-0440
    Schlagwort(e): Connections ; Geometry of Hilbert spaces ; Schrodinger operator ; [Mathematical Subject Codes] 35 J 10 ; [Mathematical Subject Codes] 46 C 05 ; [Mathematical Subject Codes] 53 C 05
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Mathematik , Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0393-0440(84)90018-4
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  • 8
    Digitale Medien
    Digitale Medien
    Magnetic Bloch analysis and Bochner Laplacians
    Amsterdam : Elsevier
    Journal of Geometry and Physics 13 (1994), S. 275-288 
    Details
    ISSN: 0393-0440
    Schlagwort(e): Bochner Laplacians ; [Mathematical Subject Codes] 20 C 35 ; [Mathematical Subject Codes] 35 Q 40 ; [Mathematical Subject Codes] 58 G 40 ; [Mathematical Subject Codes] 81 S 10 ; magnetic Bloch analysis
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Mathematik , Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0393-0440(94)90035-3
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  • 9
    Digitale Medien
    Digitale Medien
    On the massive thirring model
    Amsterdam : Elsevier
    Annals of Physics 105 (1977), S. 81-110 
    Details
    ISSN: 0003-4916
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1016/0003-4916(77)90228-7
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  • 10
    Digitale Medien
    Digitale Medien
    A conjecture on the spinor functional determinant
    Amsterdam : Elsevier
    Nuclear Physics, Section B 142 (1978), S. 525-534 
    Details
    ISSN: 0550-3213
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0550-3213(78)90228-6
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