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  • 1995-1999  (142)
  • 1940-1944  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Matrix isolation study of the interaction of excited neon atoms with CCl4: Infrared spectra of the ion products and of Cl2CCl⋅⋅Cl (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 7147-7156 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: When a Ne:CCl4 sample is codeposited at approximately 5 K with a beam of neon atoms that have been excited in a microwave discharge, the infrared spectrum of the resulting deposit includes prominent absorptions not only of CCl3 but also of several other neutral and ionic species. The absorptions assigned to CCl3+, CCl2+, and CCl+ are consistent with previous spectroscopic identifications of these species. As at lower energies, the Cl2CCl⋅⋅Cl isomer of CCl4 contributes to the product spectrum. Higher level ab initio calculations of the fundamental vibrations of this isomer and of its carbon-13 substituted counterpart give improved agreement with the experimentally observed infrared spectrum and, together with the results of a supplementary experiment, provide further support for the assignment of a structured absorption near 500 cm−1 to this species, rather than to Cl3+. Uncharged Cl2CCl⋅⋅Cl is readily destroyed by visible radiation, with concomitant growth in the absorptions of CCl4. Photodestruction of ionic species occurs in the ultraviolet spectral region. Evidence is presented for the stabilization of Cl2CCl⋅⋅Cl− and of Cl3CCl− in these experiments. The latter species undergoes photodestruction in the near infrared spectral region. Two absorptions are tentatively assigned to the ClCCl⋅⋅Cl− fragment ion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477397
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  • 2
    Electronic Resource
    Electronic Resource
    Vibrational spectra of molecular ions isolated in solid neon. XV. Infrared spectroscopic evidence for NeHF+ and HFFH+ (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 5037-5046 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: When a Ne:HF mixture is subjected to Penning ionization and/or photoionization by neon atoms in their first excited states, between 16.6 and 16.85 eV, and the products are rapidly frozen at approximately 5 K, the infrared spectrum of the resulting deposit includes absorptions assigned to NeHF+ and HFFH+. Evidence is presented suggesting that neon-matrix shifts may be anomalously large for protonated molecules which are derived from species with proton affinities near or below 550 kJ/mol. The results of earlier ab initio studies, as well as those of the present experimental and ab initio studies, indicate that the NeHF+ complex is quite strongly bound. The ν3 absorptions of NeHF+ and NeDF+ and the ν1+ν3 absorption of NeHF+ are tentatively identified. An absorption at 3064.7 cm−1 has isotopic substitution behavior appropriate for its assignment to HFFH+. Density functional calculations were performed in order to estimate the positions of the harmonic vibrational fundamentals of HFFH+-dn, and a more elaborate two-dimensional calculation on the HF-stretching potential surface was conducted in an attempt to take into account the large anharmonic contribution. Processes which occur on ultraviolet irradiation of the deposit are considered. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478402
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  • 3
    Electronic Resource
    Electronic Resource
    Spectroscopy of the fluoromethylene radicals HCF and DCF by 2+1 resonance enhanced multiphoton ionization spectroscopy and by ab initio calculation (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 1303-1308 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Spectra of fluoromethylene radicals, HCF and DCF, have been observed between 304 and 325 nm using mass-resolved, resonance enhanced multiphoton ionization (REMPI). Singlet HCF is generated by sequential reactions of atomic fluorine in either methane or methyl fluoride. The spectra arise from two-photon resonances between the ground state X˜ 1A′ and the previously unobserved E˜ 1A′ (3p) Rydberg state. The band origins lie at T0=62154±2 cm−1 (321.69±0.01 nm) and T0=62175±2 cm−1 (321.58±0.01 nm) (2σ) above the ground states for HCF and DCF, respectively. Vibrational resolution and partial rotational resolution are obtained, with ν2′=1128±4 cm−1 and ν3′=1614±4 cm−1 for HCF and ν1′=2095±5 cm−1, ν2′=872±3 cm−1, and ν3′=1582±4 cm−1 for DCF (2σ). Under typical experimental conditions, the strongest peak for HCF is due to the 210310 resonance at 308.23±0.04 nm and the strongest peak for DCF is due to the 220 resonance at 312.85±0.01 nm. The results of vibrational and rotational analyses are consistent with predictions from ab initio calculations, which also yield the adiabatic ionization potential IPa=10.06±0.05 eV (2σ).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469807
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  • 4
    Electronic Resource
    Electronic Resource
    Measurement of thermal diffusivity of small, high conductivity samples using a phase sensitive technique (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 3601-3605 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed a phase sensitive technique for measuring the thermal diffusivity of thin samples which is particularly useful for high conductivity materials such as diamond. The technique is based on a relationship between the experimentally determined frequency dependent phase shift of a thermal wave, and the geometry and thermal diffusivity of the sample. Our analysis correctly describes the phase shift for both thermally thick and thermally thin samples, which greatly expands the useful frequency range of phase shift measurements. The experimental apparatus consists of common laboratory electronics, is relatively easy to implement, and is useful over a wide range of temperatures. Measurements on glass, copper, and diamond samples at room temperature show that the accuracy and precision of the technique compares favorably with standard methods. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145475
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  • 5
    Electronic Resource
    Electronic Resource
    Role of ponderomotive density expulsion in ion Bernstein wave coupling to the core plasma (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 743-751 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: When the density at the ion Bernstein wave (IBW) antenna is relatively low, mode transformation of the electron plasma wave to the IBW is sensitive to the density gradient scale length, and hence to ponderomotive effects. A second-order nonlinear ordinary differential equation that describes mode transformation at the lower-hybrid layer, including self-consistent ponderomotive density profile modification, is solved for the rf electrostatic potential in front of the IBW antenna, for the particular case of heating just below the second harmonic of the deuterium cyclotron frequency. The complex antenna impedance and a local reflectivity are calculated, assuming vacuum within the antenna box. These calculations reveal diminished antenna coupling to the IBW with increasing ponderomotive density expulsion, as compared to the linear prediction. The ponderomotive force increases the density gradient in the edge plasma, thus enhancing reflection and lowering the loading resistance. The model also describes the direct launch of IBWs in high edge density regimes, lacking a lower-hybrid layer, where the impedance is found to be much smaller than in the low density regime. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872772
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  • 6
    Electronic Resource
    Electronic Resource
    Collisional regimes of radiation-driven Langmuir turbulence (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 1947-1960 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Numerical solutions of the Zakharov equations for a plasma driven above the electron plasma frequency by a long-wavelength radiation pump can be applied to both ionospheric modification experiments and laboratory laser-plasma interactions. A key difference between these two environments is the much larger collisional damping of Langmuir waves near the critical density in laser plasmas. Zakharov equation simulations in one and two dimensions reveal a significant change in the character of the saturated turbulence state of the electromagnetic ion-acoustic decay instability for pump strengths near threshold as the collisional damping is increased to values appropriate to certain (low-intensity) laboratory laser-plasma experiments [Phys. Fluids B 3, 1983 (1991)]. The linear-instability is then characterized by the coupling of the up- and downshifted Langmuir decay modes. A new turbulence regime differing from existing models of both weak and strong turbulence is found, which is characterized by a sequence of narrow peaks in the Langmuir frequency spectrum and a nonlinearly broadened wave-vector spectrum centered near the linearly most unstable modes. Results in this regime may be relevant to second harmonic emission experiments [Phys. Fluids B 3, 1983 (1991)]. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871455
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  • 7
    Electronic Resource
    Electronic Resource
    On the lack of influence of disorder in Cr3+-doped LiSr0.8Ca0.2AlF6 (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 2232-2234 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical and electron spin resonance spectroscopies have been used to investigate the thermal stability of lasers based on Cr3+:LiSr0.8Ca0.2AlF6, a material in which the onset of critically inhibiting nonradiative decay at temperatures below 300 K might be expected based on results from other Cr3+-activated disordered gain media. The influence of disorder on the Cr3+ environment is shown to be very small in LiSr0.8Ca0.2AlF6 so that the 4T2→4A2 fluorescence transition is not broadened relative to that in LiSrAlF6 and the onset of significant nonradiative decay is also held above room temperature. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121330
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  • 8
    Electronic Resource
    Electronic Resource
    Resonance enhanced multiphoton ionization spectroscopy of the SnF radical (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 4406-4410 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The resonance enhanced multiphoton ionization spectrum of the free radical SnF has been recorded using excitation wavelengths in the range 540 to 360 nm. The previously documented C 2Δ, D, E 2Π, and F 2Σ+ states and two hitherto unidentified excited states, the H and I 2Φ states, were all observed as two-photon resonances. Band contour simulations yielded spectroscopic constants for the E, F, and I states. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471192
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  • 9
    Electronic Resource
    Electronic Resource
    Determination of Ruthenium by Thionalide (1940)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 12 (1940), S. 561-563 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac50149a032
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  • 10
    Electronic Resource
    Electronic Resource
    Workplace Europe: new forms of bargaining and participation (1995)
    Oxford, UK : Blackwell Publishing Ltd
    New technology, work and employment 10 (1995), S. 0 
    Details
    ISSN: 1468-005X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: There are conflicting tendencies among recent developments in bargaining and participation at the workplace level in Europe. While there is an emphasis on decentralisation of bargaining structures in many countries, there is considerable variance. Similarly, there is a diversity of approaches to both direct and indirect forms of participation. Despite attempts by the European Community to integrate policies on these matters among member countries, external influences such as the globalisation of economies and technologies are leading to diverse outcomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1468-005X.1995.tb00004.x
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