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  • American Institute of Physics  (5)
  • American Institute of Physics (AIP)  (5)
  • Springer  (5)
  • American Association for the Advancement of Science (AAAS)
  • American Geophysical Union (AGU)
  • Amsterdam : Elsevier
  • Geological Society of London
  • 2000-2004
  • 1985-1989  (15)
  • 1975-1979
  • 1989  (15)
Collection
Keywords
Publisher
Years
  • 2000-2004
  • 1985-1989  (15)
  • 1975-1979
Year
  • 1
    Electronic Resource
    Electronic Resource
    Time resolved studies of vibrational relaxation dynamics of CO(v=1) on metal particle surfaces (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 4619-4620 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The vibrational relaxation dynamics of CO chemisorbed on small Pt and Rh particles supported on SiO2 has been investigated by picosecond time-resolved infrared transient bleaching experiments. A vibrational T1 lifetime of ≈7 ps has been observed for several different samples, independent of polarization, pump intensity, and sample temperature from 100–400 K. A 1:3 isotopic dilution has no effect upon T1. This T1 lifetime is a factor of 10–50 times shorter than T1 reported for metal carbonyl cluster compounds in solution and on SiO2 supports. Two possible mechanisms are considered to account for the rapid T1 decay; redistribution of the energy throughout the broad CO vibrational band, and relaxation directly to electron–hole pairs in the metal particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456598
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  • 2
    Electronic Resource
    Electronic Resource
    The spectroscopy and A state dynamics of the NeIBr van der Waals complex (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 3171-3180 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The A 3Π1←X 1Σ+ laser-induced fluorescence excitation spectrum of the NeIBr van der Waals complex is reported and analyzed to extract information regarding the structure and vibrational predissociation dynamics of the complex. While no definitive geometric information regarding NeIBr is obtained, our data indicate that a linear geometry is at least plausible. The vibrational predissociation lifetimes are a strong function of A state vibrational level and range from 2.6 to 23 ps. The variation in lifetime with vibrational level is consistent with the results of previous measurements on rare gas–halogen complexes, particularly NeBr2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455867
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  • 3
    Electronic Resource
    Electronic Resource
    Dissociation lifetimes and level mixing in overtone-excited HN3(X˜ 1A') (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 7037-7045 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vibrational overtone photodissociation is used to examine the spectroscopy and vibrational predissociation lifetimes of HN3 in its ground electronic state. Direct overtone pumping of the N–H stretching levels 5νNH and 6νNH prepares molecules in selected states (v,J,K) near 15 100 and 17 700 cm−1 of vibrational energy; spin-forbidden NH(X 3 Σ−) dissociation fragments are detected by laser-induced fluorescence. Photodissociation spectra of beam-cooled HN3 display mixing of individual rotational levels of the nνNH vibrations with several background states, with derived coupling matrix elements in the range 0.01–0.1 cm−1. Vibrational predissociation lifetimes of mixed components of 5νNH are state specific, with variations of a factor of 2 for only 0.1 cm−1 energy differences. Average lifetimes for low J, K are 210 ns for 5νNH and 0.95 ns for 6νNH. The ratio of decay rates for the two overtone levels, k(6νNH)/k(5νNH)=220, is much greater than predicted by statistical theory, which gives a ratio of 4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456230
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  • 4
    Electronic Resource
    Electronic Resource
    Instrumentation for millisecond-resolution scattering studies (invited) : INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1537-1540 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Time-resolved x-ray scattering studies of phase transition kinetics have been carried out using the wide-bandpass monochromator and fast linear position-sensitive detector system at the IBM/MIT beamline X-20C at the National Synchrotron Light Source (NSLS). We report here on the instrumentation that has been developed for these studies, and in particular on the methods used to measure, change, and control sample temperature with millisecond resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141031
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of growth conditions on the stability of α-Sn grown on CdTe by molecular beam epitaxy (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2207-2209 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of growth conditions on the stability of α-Sn films grown by molecular beam epitaxy on CdTe is studied. The growth conditions considered are substrate orientation, thickness, growth rate, and substrate temperature. The transition temperature from α-Sn to β-Sn, as determined by optical microscopy, is used as the measure of stability. It is shown that CdTe(110) is a somewhat better orientation than CdTe(100), and CdTe(111)B is totally unacceptable for the growth by molecular beam epitaxy of α-Sn films. The transition temperature from α-Sn to β-Sn shows a dependence on the total film thickness, with thinner films having a somewhat higher transition temperature than thicker. The quality of the films is the best when the growth rate is about 0.5 A(ring)/s and the growth temperature is about 75 °C. Since the transition from α-Sn to β-Sn starts at defects in the film, improving the quality of the film by lowering the growth rate and raising the growth temperature raises the transition temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101125
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of genotype and temperature on pollen tube growth in perennial ryegrass (Lolium perenne L.) (1989)
    Springer
    Sexual plant reproduction 2 (1989), S. 225-230 
    Details
    ISSN: 1432-2145
    Keywords: Lolium perenne ; Pollen tube ; Genotype ; Temperature ; Self-incompatibility ; Seed production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Low yield in seed crops of perennial ryegrass is related to low fertilization efficiency and low temperature during anthesis. To study the effect of genotype and temperature on pollen performance, we conducted greenhouse experiments at controlled temperatures. Individual florets of four genotypes that are known to differ in seed production were hand pollinated at four temperatures (14°, 18°, 22°, 26° C) both in vivo and via a semiin-vitro method involving excised florets on agar. Pollen germination and tube growth were determined with UV-fluorescence microscopy and scored in six classes at 2 h after pollination in vitro and after 0.5, 2 and 5 h in vivo. In vitro, both genotype and temperature had a significant effect on the performance of self-pollen. Pollen tube growth increased with temperature. In cross-pollinations, the pistil parent had a significant effect on pollen tube growth, and there was also a significant pistil-by-temperature interaction. In vivo, genotype and temperature significantly affected pollen performance. The genotype-by-temperature interaction was only significant 5 h after pollination. One genotype with low seed yield was pseudoself-compatible and was a relatively poor mother after cross-pollination. The effects of genotype and temperature on the growth of self-pollen might be exploited in a breeding programme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00195583
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  • 7
    Electronic Resource
    Electronic Resource
    Inclusion chemistry for the modeling of heme proteins (1989)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 7 (1989), S. 137-153 
    Details
    ISSN: 1573-1111
    Keywords: Selectivity ; hemoglobin ; myoglobin ; O2 transport ; O2 binding ; O2 carrier ; cytochrome P450 ; synthetic enzymes ; biomimics ; molecular cavity ; cyclidene ; superstructure ; lacuna ; molecular design ; host/guest complex ; quarternary complex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Early attention to the modeling of heme proteins is enhancing the understanding of biochemistry. Those studies are also contributing to the development of techniques for the modeling of still more intricate, multifunctional, variously selective natural systems. Selectivity in simple systems may involve the molecular capability to bind only one of a family of related species or it may mean the ability to select and control one of a number of possible functions of a given bound species. Complicated systems simultaneously combine the two kinds of simple selectivities for two or more different classes of guest, often with synergistic interrelationships. The subject is developed around examples of binary, tertiary, and quarternary complexes designed to model the behavior of monooxygenases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01060716
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  • 8
    Electronic Resource
    Electronic Resource
    Old-growth red spruce communities in the mid-Appalachians (1989)
    Springer
    Plant ecology 85 (1989), S. 45-56 
    Details
    ISSN: 1573-5052
    Keywords: Old-growth forest ; Picea rubens ; Spruce decline ; Subalpine forest ; Virginia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Old-growth stands of red spruce (Picea rubens) were sampled at the only four localities in the mountains of southwestern Virginia and central West Virginia where examples of such are known to exist. Based upon mean ages (±SE) of cored trees, sampled stands ranged in age from 164±18 to 201±10 yr. Dendro-ecological (tree-ring) analysis showed a marked decline in growth of trees at three localities during the late 1800s, followed by recovery to previous levels of growth within two decades. This growth-trend decline generally coincides with a period of extensive mortality of red spruce reported to have occurred in central West Virginia. Basal area of trees ≥2.5 cm DBH ranged from 35.4 to 46.1 m2/ha. These figures are considerably lower than those recorded at earlier dates for similar old-growth stands in the Appalachians, which suggests that a general decline has occurred over the last half-century.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042254
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  • 9
    Electronic Resource
    Electronic Resource
    Serogenetic investigations of Tibetans and Himachalis from Himachal Pradesh, India: Genetic relationship between Tibetans and certain selected mongoloid populations (1989)
    Springer
    Journal of human genetics 34 (1989), S. 143-157 
    Details
    ISSN: 1435-232X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Twenty two serogenetic systems were investigated in 115 Tibetans and 128 Himachalis from the state of Himachal Pradesh, north-west India. For eight of the loci (ABO, Rh, MNSs, P, Fy, 6PGD, EsD, and AK) the two populations showed conclusive heterogeneity and their frequency distribution showed that the serogenetic differences between two populations are due to their different racial affliations. The Tibetans were also analysed for their genetic relationship with certain selected populations from the Cis-Himalayan, far east and south Asian regions. The calculations of the Harpending's kinship matrix R and the genetic distances showed that the Tibetans are closer to the mongoloid populations of the Cis-Himalayan region and the differences in the present day population structure of the mongoloid groups of this region are more likely to be due to differential migration, admixture and racial affliation although there is a slight possibility of disruptive selection for certain loci such as 6PGD and AK which showed an exceptionally high value of Canning (6PGD *C) andAK *1 genes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01912483
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  • 10
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    Instrumentation for millisecond‐resolution scattering studies (invited) (1989)
    American Institute of Physics
    Details
    Publication Date: 1989-07-01
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics
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