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  • 1
    Digitale Medien
    Digitale Medien
    Vibrationally enhanced inelastic atom–molecule cross sections at very low energies (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 8819-8829 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Rate constants for inelastic processes in Na2 (v,j)–Ne, Ar, Na collisions are determined at a mean collision energy of the order of 1 meV in a supersonic seeded beam arrangement. The initial vibrational state v and rotational state j is varied in the range 4≤v≤35 and 5≤j≤25. The Na2 molecules are excited by Franck–Condon pumping near the transition region to free molecular flow and the flux of molecules which survive in the level (v,j) is monitored far downstream behind a small aperture. It is shown that elastic processes do not contribute to the observed signal. The magnitude of the cross section for the sum of all inelastic processes is as large as several hundred A(ring)2. It is found that the vibrational motion of the molecule, which carries an energy of up to 500 meV, strongly influences the collision dynamics. The rate constant increases with v by about 35% within the range of vibrational levels studied here. Some state-to-state rate constants are also reported. The experimental results are in good agreement with data from quasiclassical trajectory calculations on a semiempirical bond-distance-dependent potential surface. The observations can be rationalized by realizing that the long range attraction increases with vibrational excitation since the polarizability of the molecule increases. Furthermore, the vibrational excitation in combination with the relatively long interaction time due to the low collision energy enhances the probability for a change of the initial quantum state of the molecule.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.462239
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  • 2
    Digitale Medien
    Digitale Medien
    A 2.45 GHz multicusp ECR-ion source for neutral–beam diagnostics at the tokamak TEXTOR : Proceedings of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2544-2546 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: In order to implement a new setup for neutral–beam activated impact excitation spectroscopy at the nuclear fusion experiment "TEXTOR'' (Tokamak Experiment for Technology Oriented Research) a 2.45 GHz ECR multicusp ion source was built. Special emphasis was given to extract an intense He+-ion beam, which will be used in the forthcoming experiment. After neutralization the slow (2.2 × 107 cm/s, 1 keV) He atoms are injected into the tokamak plasma. Necessarily the atom beam has to have a small divergence. To optimize the extraction optics, calculations concerning the multihole extraction aperture have been made, taking different ECR-plasma parameters into account. The divergence shows a strong dependence on the extracted beam current density ((approximately-greater-than)5 mA/cm2) and the chosen optics. The ion source has to be operated in a pulsed mode (max. 5 kHz, duty cycle 50%) due to experimental requirements.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1142883
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  • 3
    Digitale Medien
    Digitale Medien
    Relationships between infant crying, birth complications, and maternal variables (1998)
    Oxford, UK : Blackwell Science Ltd
    Child 24 (1998), S. 0 
    Details
    ISSN: 1365-2214
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin , Psychologie
    Notizen: The aim of the study is to identify factors influencing infants’ crying behaviour (total crying duration, length of crying bouts, and frequency of crying). The searching for variables explaining inter-individual differences requires a sufficient stability of the cry parameters at least over short time intervals. Thus, a second aim is to assess the intra-individual stability of the crying behaviour in an age range from 3 to 12 months. Sixty-two mother–child dyads participated in the study. The results show substantial stabilities of the crying behaviour of infants between 3 and 12 months of age. This is related to the amount of crying as well as to the pattern of crying shown by the children over a 24 h interval. The typical cry pattern is characterized by peaks at 12.00 h and early in the evening, although there are large individual differences between the children with regard to cry durations at each hour of the day. Regarding the cry durations at 3 months of age, birth complications and the perceived emotional atmosphere in the mothers’ family of origin are the major contributing factors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2214.2002.00090.x
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  • 4
    Digitale Medien
    Digitale Medien
    Active microlevers as miniature torque magnetometers (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 8166-8173 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: An extremely sensitive miniature torque magnetometer using Si p-doped piezoresistive cantilevers is described. The magnetization m↘ of very small magnetic or superconducting samples (≤1 μg) deposited on the cantilever can be measured via the torque τ↘=m↘×B↘ produced on them by an applied field B. The high resolution in the lever deflection of the order of 0.1 A(ring) corresponds to a torque sensitivity of the order of Δτ(approximately-equal-to)10−14 Nm. In a homogeneous field of 1 T this device allows magnetic moments as small as Δm(approximately-equal-to)10−14 Am2 to be measured, a value far smaller than that measurable by the best commercial superconducting quantum interference device magnetometers. Measurements performed on microcrystals of the high-Tc superconductors Bi2Sr2Ca1Cu2O8 and Hg1Ba2Ca3Cu4O10 in the static and dynamic modes demonstrate the excellent performance of this device at low temperature and in magnetic fields ranging between a few mT and 5 T. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.362550
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  • 5
    Digitale Medien
    Digitale Medien
    Dual-side contact formation on isolated diamond films (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 2461-2463 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A method is described for transferring deposited diamond films to a second substrate, thereby providing access to the diamond film back surface and also allowing post-deposition contact formation to both surfaces of the film. The availability of both sides of the diamond film allows increased experimental control and flexibility for investigation of electrical properties and contact phenomena. The films are deposited in a microwave plasma disk reactor onto silicon substrates and transferred to epoxy substrates. Also presented is a comparison of the roughness of the top and bottom film surfaces, a Raman spectrum of the transferred film, and current-voltage characteristics of samples with dual-side contacts.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.103851
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  • 6
    Digitale Medien
    Digitale Medien
    Potential scan voltammetry with finite diffusion. Unified theory (1972)
    s.l. : American Chemical Society
    Analytical chemistry 44 (1972), S. 434-442 
    Details
    ISSN: 1520-6882
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ac60311a008
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  • 7
    Digitale Medien
    Digitale Medien
    Numerical Methods in Boundary-Layer Theory (1978)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 10 (1978), S. 417-433 
    Details
    ISSN: 0066-4189
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Maschinenbau , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.fl.10.010178.002221
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  • 8
    Digitale Medien
    Digitale Medien
    ANALYSE ÉLECTROCHIMIQUE. (1900)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 22 (1900), S. 363-364 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja02044a013
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  • 9
    Digitale Medien
    Digitale Medien
    ELECTRO-CHEMICAL ANALYSIS. (1894)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 16 (1894), S. 574-574 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja02106a016
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  • 10
    Digitale Medien
    Digitale Medien
    SOME RECENT CONTRIBUTIONS TO OUR KNOWLEDGE OF METALLIC REDUCING AGENTS.1 (1894)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 16 (1894), S. 833-844 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja02110a009
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