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  • American Institute of Physics (AIP)  (253)
  • Nature Publishing Group  (139)
  • American Geophysical Union (AGU)
  • 1985-1989  (318)
  • 1980-1984  (74)
  • 1
    Electronic Resource
    Electronic Resource
    Structure of the nucleosome core particle at 7 Å resolution (1984)
    [s.l.] : Nature Publishing Group
    Nature 311 (1984), S. 532-537 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The crystal structure of the nucleosome core particle has been solved to 7 Å resolution. The right-handed B-DNA superhelix on the outside contains several sharp bends and makes numerous interactions with the histone octamer within. The central turn of superhelix and H3 · H4 tetramer ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/311532a0
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  • 2
    Electronic Resource
    Electronic Resource
    Modelling radioactive waste disposal by penetrator experiments in the abyssal Atlantic Ocean (1984)
    [s.l.] : Nature Publishing Group
    Nature 310 (1984), S. 130-133 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The GME area lies in the southwestern distal part of the Madeira Abyssal Plain (Fig. 1). Extensive geological and geophysical studies have been carried out there by the Rijks Geologische Dienst of the Netherlands and by the UK Institute of Ocanographie Sciences7"11. The sediments found there ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/310130a0
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  • 3
    Electronic Resource
    Electronic Resource
    Diacylglycerol and phorbol ester stimulate secretion without raising cytoplasmic free calcium in human platelets (1983)
    [s.l.] : Nature Publishing Group
    Nature 305 (1983), S. 317-319 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The methods for incorporating quin2 into intact cells and using its fluorescence to monitor [Ca2*! have been detailed elsewhere, together with evidence that the trapped indicator is largely confined to the cytoplasm and measures cytoplasmic free calcium17'18. Shape-change and aggregation were ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/305317a0
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  • 4
    Electronic Resource
    Electronic Resource
    Correlation of molecular valence- and K-shell photoionization resonances with bond lengths (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 1796-1812 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A theoretical study of the relationship between interatomic distances and the spectral positions of valence- and K-shell σ* photoionization resonances is reported for a selected series of molecules. Three-dimensional graphical representations of the occupied and virtual-valence σ-symmetry orbitals of these compounds reveal their striking similarity to the wave functions of a particle in a cylindrical well, substantiating qualitative notions long employed in free-electron molecular orbital (FEMO) approximations. Accordingly, the molecular potential along the symmetry axis in these compounds is modeled after a finite square well, with a depth approximately equal to the energy of the lowest σ-symmetry valence molecular orbital and a width determined from analogies to FEMO theory. Calculated minimal-basis-set molecular-orbital energies for both occupied and virtual states are seen to correlate accurately with the simple square-well energy level formula (π2 /2)(n2/l 2 ) when measured in Hartree atomic units from the bottom of the well. The calculated σ* orbital energies are furthermore in excellent agreement with experimentally and theoretically determined valence-shell photoionization resonance positions, the latter consequently also satisfying the square-well correlation formula. A similar situation obtains for experimentally and theoretically determined K-shell resonance positions, although energy shifts from minimal-basis values are evident in these cases. These circumstances are clarified quantitatively on basis of Feshbach–Fano considerations, in which minimal-basis-set virtual-valence σ* orbitals play the roles of zeroth-order states subject to modification by interactions with nonresonant background continua. Concluding remarks contrast and compare molecular-orbital and square-well approaches to photoionization resonances with those based on multiple-scattering and barrier models. The present results appear to clarify the origins of recently reported empirical correlations of bond lengths with resonance positions, and help to determine their range of applicability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457085
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  • 5
    Electronic Resource
    Electronic Resource
    Emission spectra of SiF3 (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 2834-2835 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Emission spectra of SiF3 radical were observed from photodissociative excitation of SiF4 at 99.1, 95.5, and 92.3 nm. The spectra show a broad visible band in the 350–800 nm region, a UV band in 290–340 nm, and a weak band in 240–280 nm. The visible band resembles the chemiluminescence spectra observed from etching of silicon by F or XeF2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455935
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  • 6
    Electronic Resource
    Electronic Resource
    Cross sections and coherence terms for associative ionization of two differently excited Na(3p) atoms (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 738-753 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The associative ionization process in thermal Na(3p)–Na(3p) encounters has been studied in a series of crossed-beam experiments where the light polarization of the two laser beams preparing the excited atoms before collision was varied independently. It is shown how in this way maximum possible information for our geometry is extracted about the dependence of the ion formation process on the shape and spatial orientation of the electron clouds of the two approaching atoms, including all coherence terms. The experimental findings are discussed in the light of recent theoretical results for the states of the Na2 molecule. It is concluded that just a few of the possible geometrical approaches are favorable for molecular–ion formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456152
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  • 7
    Electronic Resource
    Electronic Resource
    Erratum: Laser induced fluorescence study of the B˜ 2B2→X˜ 2A2 transition of the furan cation in a supersonic free jet expansion [J. Chem. Phys. 87, 4435 (1987)] (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 2591-2592 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455740
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  • 8
    Electronic Resource
    Electronic Resource
    Laser induced photodissociation and desorption. I. CH2I2 adsorbed on Al2O3 (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 3318-3331 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: CH2I2 molecules adsorbed on Al2O3 and Ag surfaces are used as model systems for studying the photofragmentation and desorption processes on solid surfaces involving electronic excitation of the adsorbate. The molecules are activated into an antibonding state by a ultraviolet (UV) light pulse and the desorption behavior is monitored by time-of-flight mass spectrometry. The surface coverage and chemical changes due to laser irradiation are determined by x-ray photoemission and thermal desorption spectroscopies. The desorption yields as well as the mass and the translational energy distributions are measured as a function of the surface coverage, the laser fluence, and the number of laser pulses. The UV radiation effect on a mixture of CH2I2 and NH3 as coadsorbates on Al2O3 is also examined. The results reveal the characteristic electronic, thermal, and "explosive'' desorption effects depending on both the gaseous exposure and the laser irradiation conditions. The quantum yields, the molecular selectivities, the energetics of dissociation and the desorption mechanisms are discussed based on the experimental observations. For clarity, the results and analyses are presented in two parts: CH2I2/Al2O3 in paper I and CH2I2/Ag in paper II of this series.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455886
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  • 9
    Electronic Resource
    Electronic Resource
    Heat capacity of some liquid Zintl compounds: Equiatomic alkali–lead alloys (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 5869-5875 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Enthalpies for equiatomic APb (A=Na, Rb, and Cs) have been measured by high-temperature drop calorimetry over a temperature range covering solid and liquid phases. Thermodynamic information on the solid state transitions and the melting process is derived. With the exception of NaPb, the heat capacities of the liquid alloys show a remarkably strong negative temperature dependence above the melting point. It is suggested that this behavior is a consequence of the dissociation of molecular entities present in the liquid state related to the Zintl structures detected in the corresponding solid compounds. Thermodynamic calculations based on the presence of polyvalently charged anions yield valuable information on the temperature dependence of the concentration of these species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455538
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  • 10
    Electronic Resource
    Electronic Resource
    Nuclear spin relaxation in NH4ClO4 and ND4ClO4 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1203-1204 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Spin–lattice relaxation times for chlorine and deuterium isotopes in NH4ClO4 and ND4ClO4 have been measured over the temperature range 153 to 295 K. No evidence in support of the hypothesis that there is a phase transition near 180 K has been found in the results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455235
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