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  • 1
    Electronic Resource
    Electronic Resource
    Electronic absorption spectra of size-selected hydrated electron clusters: (H2O)n−, n=6–50 (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 811-814 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report photodestruction spectra for the (H2O)n− clusters (n=6, 11, 15, 20, 25, 30, 35, 40, and 50) in the range 0.7–1.6 eV. The spectra are observed to strongly redshift and narrow with decreasing cluster size, with a concomitant increase in peak intensity. The maxima occur well below the vertical detachment energies for n〉20 and almost exclusively result from excitation of a bound–bound transition.© 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473167
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  • 2
    Electronic Resource
    Electronic Resource
    Maternal alpha-fetoprotein levels in multiple pregnancies (1994)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 101 (1994), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1994.tb13084.x
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  • 3
    Electronic Resource
    Electronic Resource
    Author's reply (1993)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 100 (1993), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1993.tb15129.x
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  • 4
    Electronic Resource
    Electronic Resource
    Negative Ion Zero Electron Kinetic Energy Spectroscopy of I-·CH3I (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 1633-1636 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100006a002
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  • 5
    Electronic Resource
    Electronic Resource
    Spin polarization of gold films via transported (invited) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6714-6719 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spin injection technique has been adapted to a thin-film geometry. Measurements of the spin-coupled voltage Vs as a function of film thickness d result in a determination of the spin diffusion length δs =(square root of)DT1 with D the electron diffusion constant, in polycrystalline gold films. The conduction electron spin relaxation time T1 is found to be 4.6±2.5×10−11 s, for the temperature range 4 K〈T〈70 K. The magnitude of Vs is large enough to suggest device applications. In a three-terminal trilayer device, an electric current Ie biasing a thin permalloy film injects spin-polarized electrons into gold films of thickness 100 nm≤d≤5.1 μm, and induces a nonequilibrium magnetization M˜. A second permalloy film detects the bipolar, spin-coupled voltage eVs=βM˜/χ, where β is the Bohr magneton, χ the Pauli susceptibility and e the electron charge. The sign of Vs depends on the relative orientation of the magnetizations of the permalloy films. In the thin limit, d〈δs, the magnitude of the spin-coupled impedance Zs=Vs/Ie scales inversely with d. In the thick limit, d(approximately-greater-than)δs, Zs is exponentially diminished.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356848
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  • 6
    Electronic Resource
    Electronic Resource
    Infrared spectra of hydrogen-bonded ion–radical complexes: I−⋅HCH2 and Br−⋅HCHBr (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 10464-10468 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the preparation and infrared spectra of the CH3I− and CH2Br2− anions formed by argon cluster-mediated electron attachment to the neutral molecular precursors. Infrared predissociation spectra were acquired for both the bare and argon-solvated species in the C–H stretching region. Partial rotational structure was recovered in the CH3I− system, consistent with the hydrogen-bonded, C2v structure suggested in an earlier analysis of its photoelectron spectrum [J. Kim et al., J. Am. Soc. Mass Spectrom. 10, 810 (1999)]. The spectrum and photofragmentation pattern confirm that this species is trapped in a very weakly bound ion–methyl radical form (I−⋅HCH2) involving a single ionic H bond. The CH2Br2− anion displays a similar spectrum, where one CH stretch is significantly redshifted, again signaling the single H-bonding motif. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480392
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  • 7
    Electronic Resource
    Electronic Resource
    Infrared spectroscopic observation of the argon isomer distribution in evaporative ensembles of I−⋅ROH⋅Arm (R=methyl, ethyl, isopropyl) clusters (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 9593-9599 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vibrational predissociation spectra of argon-solvated iodide–alcohol clusters (I−⋅ROH⋅Arm, ROH=MeOH, EtOH, i-PrOH) are reported in the OH stretching region (3200–3400 cm−1). The spectra display multiple peaks associated with the ionic H-bonded OH stretching fundamental, which vary according to the extent of argon solvation. At small m, the number of peaks reflects the total number of attached argon atoms, such that peaks associated with fewer argons persist (with a small blue shift) in the spectra of the larger clusters, while new peaks appear red shifted by about 12 cm−1 with each additional argon. The effect saturates in a manner that depends on the particular alcohol (mmax=6 for MeOH, 5 for EtOH, and 4 for i-PrOH). We interpret these observations to indicate the presence of multiple isomers in the evaporative ensemble, which are distinguishable according to the different arrangements of argon atoms among two effective binding sites. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480292
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  • 8
    Electronic Resource
    Electronic Resource
    Vibrational predissociation spectroscopy of the (H2O)6−⋅Arn, n≥6, clusters (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 444-449 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Solvation of (H2O)6− with several argon atoms suppresses the strong direct photodetachment background in the bare hexamer anion, allowing vibrational predissociation spectroscopy to be carried out in a background-free regime. In addition to the previously reported autodetaching resonances [C. G. Bailey, J. Kim, and M. A. Johnson, J. Phys. Chem. 100, 16782 (1996)] in the single donor hydrogen bonding region (∼3300 cm−1), the predissociation spectra reveal many weak bands scattered throughout the mid infrared (3200–3750 cm−1). Most of these new bands are evident in the bare hexamer spectrum after signal averaging, indicating that they are isolated using predissociation but not induced by solvation. The most intense bands display much stronger redshifts (〉30 cm−1 by n=15) than the matrix shifts typically found for the neutral water clusters, indicating that these bands are unique to the negative ion. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475406
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  • 9
    Electronic Resource
    Electronic Resource
    An infrared study of the competition between hydrogen-bond networking and ionic solvation: Halide-dependent distortions of the water trimer in the X−⋅(H2O)3, (X=Cl, Br, I) systems (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 7129-7132 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vibrational spectra of the water trimers solvating the halide anions (Cl−, Br−, I−) have been acquired in the OH stretching region by predissociation spectroscopy of the X−⋅(H2O)3⋅Ar3 complexes. These "wet" ions display two groups of bands assigned to normal modes of the (C3) pyramidal structure. We interpret the evolution of the spectra down the halogens in the context of the rings closing up toward the structure of the bare (H2O)3 neutral. This trend is discussed in terms of the disruptive effect of the ionic H bonds on the water network. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478616
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  • 10
    Electronic Resource
    Electronic Resource
    Infrared spectroscopy of negatively charged water clusters: Evidence for a linear network (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 6268-6277 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report autodetachment spectra of the mass-selected, anionic water clusters, (H2O)n−, n=2, 3, 5–9, 11 in the OH stretching region (3000–4000 cm−1), and interpret the spectra with the aid of ab initio calculations. For n≥5, the spectra are structured and are generally dominated by an intense doublet, split by about 100 cm−1, which gradually shifts toward lower energy with increasing cluster size. This behavior indicates that the n=5–11 clusters share a common structural motif. The strong bands appear in the frequency region usually associated with single-donor vibrations of water molecules embedded in extended networks, and theoretical calculations indicate that the observed spectra are consistent with linear "chainlike" (H2O)n− species. We test this assignment by recording the spectral pattern of the cooled (argon solvated) HDO⋅(D2O)5− isotopomer over the entire OH stretching frequency range. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478531
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