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  • Nature Publishing Group  (9)
  • American Institute of Physics (AIP)  (7)
  • Wiley-Blackwell  (3)
  • American Geophysical Union (AGU)
  • 1985-1989  (11)
  • 1945-1949  (8)
  • 1
    Electronic Resource
    Electronic Resource
    TFTR Thomson scattering system (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1015-1017 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The TFTR Thomson scattering system has been operational since January 1984. The diagnostic uses two ruby lasers and two spectrometer-detector systems to provide profiles at two times in a discharge. The two scattering lines consist of 76 spatial channels which span the 200-cm vacuum vessel along a major radius. The detectors are gated, intensified CCD arrays with single photoelectron sensitivity. Te(R) and Ne(R) profiles are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138255
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  • 2
    Electronic Resource
    Electronic Resource
    High power picosecond laser system at 248 nm (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 2235-2240 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe a powerful picosecond KrF* laser system consisting of a synchronously pumped dye oscillator, a three-stage dye amplifier, frequency conversion to 248 nm, and amplification through a series of excimer modules. Characteristics are given at each stage of the system. With the first stage of the system complete, a focused intensity of ∼1016 W/cm2 is obtained. Initial visible spectra obtained by interaction with various targets are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139940
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  • 3
    Electronic Resource
    Electronic Resource
    Instrumentation and data acquisition for in situ electrochemistry at the Daresbury SRS : INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2386-2389 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: X-ray diffraction and absorption spectroscopy provide complementary structural tools for the in situ characterization of electrode surfaces. To optimize surface sensitivity, techniques such as glancing angle scattering geometries and spectrum differencing can be employed while the application of synchrotron radiation allows the real-time collection of data. This paper outlines recent developments in in situ electrochemistry on the Daresbury SRS and describes an electrochemical cell for in situ x-ray studies, associated glancing angle instrumentation, together with computer hardware and software optimized for data acquisition using potential modulation techniques. Important fundamental and industrial applications are highlighted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140727
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  • 4
    Electronic Resource
    Electronic Resource
    Collisional relaxation of DF(v=1) and HF(v=1) by the DF dimer (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 1340-1347 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Overtone vibration-laser double resonance measurements determine the vibrational relaxation rates of DF(v=1) and HF(v=1) by the DF dimer. Both monomers are efficiently relaxed by the dimer at a rate that is 20% of the gas kinetic rate. The similarity of the rate constants for the two systems, which have very different energy defects, indicates that the relaxation occurs by collision complex formation and energy redistribution, rather than direct vibration-to-vibration energy transfer from the monomer to the dimer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452222
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  • 5
    Electronic Resource
    Electronic Resource
    Collisional energy transfer via vibrational predissociation: Relaxation of HF(v=1) by HF dimers (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 1132-1137 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Overtone vibration–laser double resonance measurements determine the vibrational relaxation rate of HF(v=1) by HF dimers. Vibration-to-vibration energy transfer from the excited monomer to the dimer followed by vibrational predissociation of the dimer provides an efficient pathway for vibration-to-translation energy transfer that deexcites the monomer at 40% of the gas kinetic collision rate. Analysis of the pressure dependence of the observed decay constants using a simple kinetic model establishes a rough upper limit of 10 ns on the predissociation lifetime of the collisionally excited dimer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449475
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  • 6
    Electronic Resource
    Electronic Resource
    A direct determination of the role of vibration-to-vibration energy transfer in HF(v=3,4) self-relaxation (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 220-226 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Overtone vibration-laser double resonance directly measures the relative importance of vibration-to-vibration and vibration-to-translation-and-rotation energy transfer for HF(v=3 and v=4) at room temperature. The fraction of HF(v) molecules relaxing by V–V energy transfer is 0.44±0.05 and 0.16±0.05 for v=3 and v=4, respectively, compared to 0.59±0.10 for v=2. These measurements show that V–T,R energy transfer is the dominant relaxation mechanism for HF(v≥3) and the observed decreased amount of V–V energy transfer for higher initially excited vibrational levels is in good agreement with a chemiluminescence measurement and several theoretical calculations. The data demonstrate that the magnitude of the energy defects for the component pathways primarily determines the energy transfer mechanism for HF(v=2–4).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450174
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  • 7
    Electronic Resource
    Electronic Resource
    Rates and pathways of vibrational self-relaxation of HF(v=2) between 300 and 700 K (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 780-788 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The temperature dependencies of the total self-relaxation rate constants for the vibrational deactivation of HF(v=2) and HF(v=1) and the state-to-state vibration-to-vibration (V–V) and vibration-to-translation-and-rotation (V-T,R) energy transfer components of the HF(v=2) self-relaxation process are measured using the overtone vibration excitation-laser double resonance technique. The total self-relaxation rate constants vary inversely with temperature. The much weaker temperature dependence of HF(v=2) self-relaxation compared to that of HF(v=1) arises from the significant role of the V–V energy transfer route. Competition between energetics and collision duration results in a weaker inverse variation with temperature for the slightly endothermic V–V route than for the exothermic V-T,R route for HF(v=2). The branching ratio for V–V energy transfer increases slightly with temperature and the data suggest that two quantum relaxation processes constitute no more than 10% of the total self-relaxation of HF(v=2). The available temperature dependence data on self-relaxation of HF(v=1–5) form a consistent picture in which the energetics of the V–V and V-T,R relaxation pathways control their relative contributions to the total energy transfer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448503
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  • 8
    Electronic Resource
    Electronic Resource
    Thumb of the Swartkrans Ape-Man (1949)
    [s.l.] : Nature Publishing Group
    Nature 164 (1949), S. 841-842 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ONE of the most noteworthy differences between man and the higher anthropoids is that while man has a good opposable thumb, in the anthropoid the thumb is somewhat degenerate. It was mainly on this character that Osborn decided that man could not have evolved from an anthropoid. Though we ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/164841c0
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  • 9
    Electronic Resource
    Electronic Resource
    A New Type of Fossil Man (1949)
    [s.l.] : Nature Publishing Group
    Nature 164 (1949), S. 322-323 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN the cave at Swartkrans which has now yielded the jaws and skulls of the huge ape-man Paranthropus crassidens, there was found by Mr. J. T. Robinson, on April 29, 1949, the lower jaw of what is fairly manifestly a new type of man. Though this was discovered in the same cave as the large ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/164322a0
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  • 10
    Electronic Resource
    Electronic Resource
    Size of the Brain in the Ape-Man, Plesianthropus (1948)
    [s.l.] : Nature Publishing Group
    Nature 161 (1948), S. 438-438 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THOUGH the brain of the young Australopithecus is about 500 c.c. and that of the adult perhaps 600 c.c. or more, the brain of the type Plesianthropus about 450 c.c, and of the beautiful female skull about 415 c.c, it has been suspected that some male brains may have been very much larger. The ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/161438a0
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