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  • 1
    Electronic Resource
    Electronic Resource
    Particulate Cu on Ordered Al2O3: Reactions with Nitric Oxide and Carbon Monoxide (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 9874-9881 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100090a023
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  • 2
    Electronic Resource
    Electronic Resource
    Infrared studies of room temperature deposition of hydrogenated silicon oxide films in rf magnetron discharges (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 3342-3347 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The properties of a-SiOx:H thin films deposited at low temperature (∼ 50 °C) in a low energy magnetron rf plasma system with Ar/SiH4/O2 gas mixtures are investigated. In the low pressure regime (about 5 mTorr reactive gases), the surface reaction dominates in the film formation process. As the partial pressure ratio (ROS) of oxygen to silane increases, the Si-H related vibrational modes gradually disappear, and the film becomes stoichiometric SiO2 for ROS≥1. High quality oxide film can be deposited due to the low pressure environment and the plasma promoted surface process. In the high pressure regime (tens of mTorr) the deposited SiO2 films contain fine particles (tens of nanometer in size) and are porous (15% void) due to the gas phase homogeneous reaction and aggregation. The infrared absorbance spectra with normal and oblique incidence imply different origins of the half width and the shoulder intensity of the 1070 cm−1 Si-O(s) mode. In comparison with the low pressure dense films, the narrow half width of the high pressure film may be caused by the more ordered local structure which has a narrower distribution of bond angle and length, while the large shoulder intensity may be dominated by the larger (fine particle size) scale disorder. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360028
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  • 3
    Electronic Resource
    Electronic Resource
    Raman resonance de-enhancement in the excitation profile of CS2 (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 1352-1358 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The total differential Raman cross section of the symmetric vibrational mode of CS2 (652 cm−1) in liquid phase has been measured as a function of excitation wavelength from the visible to the ultraviolet. The resulting excitation profile shows a strong preresonance enhancement when the excitation wavelength is less than 300 nm. The cross section measured at 240 nm is about three orders-of-magnitude larger than the ν4 dependence for Raman scattering. The observed preresonant effect appears to be dominated by the 1B2(1Σu+)←1Σg+ transition. A minimum in the excitation profile occurs at a wavelength that is associated with the peak of the near-UV absorption band (∼320 nm). The observed dip in the profile is ascribable to a quantum interference between the 1B2(1Σu+) and the two Renner–Teller components, 1B2 and 1A2(1Δu). The transition from the ground state to the lower electronic state is electronically forbidden, but it becomes vibronically allowed due to the Renner–Teller interaction. This may be the first observation of Raman resonance de-enhancement due to the interference involving three excited states. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476687
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  • 4
    Electronic Resource
    Electronic Resource
    Near-infrared vibronic spectrum of the CH2 b˜ 1B1←a˜ 1A1 transition (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 9236-9245 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A Doppler-limited high resolution vibronic spectrum of the methylene (CH2) b˜ 1B1←a˜ 1A1 transition in the near-infrared wavelength region has been obtained using transient absorption techniques. The radical was produced by 308 nm excimer laser photolysis of ketene (CH2CO) in a flow system. The analysis of this spectrum confirms the reassignments of some previously observed bands as well as the presence of new vibronic bands predicted by a recent ab initio calculation [Green et al., J. Chem. Phys. 94, 118 (1991)]. We also measured the Doppler broadened profiles of low-J rotational lines of CH2 under collisionless conditions. From the line profile analysis, we find that the 308 nm photolysis of ketene produces fragments with isotropic and uncorrelated velocity and angular momentum distributions. The Doppler profiles also provide a view of the coincident product state distributions. The measured Doppler profiles are consistent with a rotational distribution of CO produced in coincidence with low energy CH2 states given by statistical phase space theory. The vibrationally excited coincident CO appears, however, to be produced about 2–3 times more efficiently than is predicted by various statistical theories. A frequency modulation (FM) technique has been adopted to improve the sensitivity of the transient absorption experiment. There is a significant improvement in the observed signal to noise ratio of the CH2 spectrum over the dual beam method previously used. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468015
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  • 5
    Electronic Resource
    Electronic Resource
    Purification and characterization of a plasminogen activator secreted by cultured human pancreatic carcinoma cells (1977)
    s.l. : American Chemical Society
    Biochemistry 16 (1977), S. 1908-1913 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00628a023
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  • 6
    Electronic Resource
    Electronic Resource
    Granulocyte and macrophage colony-stimulating factor from human placenta conditioned medium (1980)
    s.l. : American Chemical Society
    Biochemistry 19 (1980), S. 3846-3850 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00557a031
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  • 7
    Electronic Resource
    Electronic Resource
    Hollow oval magnetron for large-area low-energy ions (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 1949-1951 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A novel device, the "hollow oval magnetron,'' was designed and characterized. The device has a hollow electrode with an oval cross section. It sustains a large-area uniform plasma with low-energy ions under low pressure and moderate rf power (Ni ∼1011 cm−3, Γi ∼0.5 mA/cm2, Ei ∼30 eV, and P∼5 mTorr). The energy distribution of ion current onto the hollow electrode has a broad spread ΔEi /E¯i ∼1 in the rf mode, and a narrow peak ΔEi/ E¯i ∼0.1 with a low-energy tail in the dc mode. The device is a good candidate for low-energy high-rate plasma-material processing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337195
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  • 8
    Electronic Resource
    Electronic Resource
    Photodissociation, third harmonic interferences, polarization effects, and the MPI spectroscopy of chlorine (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 1131-1135 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present a study of the multiphoton ionization spectrum of chlorine in the region of 2 1Πu←X 1Σ+g(1,0–0) three-photon resonances. Spectra at various pressures were obtained with different polarizations and counterpropagating beam experiments were carried out to restore the peaks quenched by third harmonic interference effects. Chlorine atoms, caused by photodissociation, produce prominent lines in the spectrum and are also responsible for third harmonic generation (THG) which in turn excites some spin-forbidden transitions by one-photon absorption. We discuss the change of polarization behavior in the presence of THG and the resultant effect on the symmetry assignments of the excited states. We also discuss third harmonic destructive interference effects in molecular systems and show that total suppression of three-photon transition to one-photon allowed states, common in atoms, will not usually occur in molecules although in general changes in polarization behavior should be observed at higher pressures. This conclusion is demonstrated in the chlorine spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452255
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  • 9
    Electronic Resource
    Electronic Resource
    Ultraviolet mini-Raman lidar for stand-off, in situ identification of chemical surface contaminants (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 3485-3489 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The Mini-Raman Lidar System (MRLS) is a portable chemical sensor that combines the spectral fingerprinting of Raman spectroscopy with the principles of solar-blind ultraviolet lidar for short-range, noncontact detection and identification of unknown substances on surfaces. The MRLS has the potential to detect contaminant films several microns thick at distances of meters and bulk quantities of substances at distances of tens of meters. The signal acquisition time is less than 1 min. The device has application to those involved in emergency response, environmental remediation, and military reconnaissance who respond initially at the site of a chemical spill or attack. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1288255
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  • 10
    Electronic Resource
    Electronic Resource
    Measurement of (00v3) levels in X 2Π NCO by stimulated emission pumping spectroscopy (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 7218-7228 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Laser induced fluorescence measurements of NCO formed in the reaction CN+O2→NCO+O in a free jet expansion are reported. The rotational temperature achieved in the experiments was typically 10–15 K and absorption from vibrationally excited levels was very much reduced in intensity. Two bands in the A˜–X˜ system, the v1, v2, v3=200–000 and 120–000, of the radical were rotationally resolved for the first time, and wavelength resolved laser excited fluorescence measurements have been used to characterize many ground state vibronic energy levels below 6000 cm−1 in energy. Stimulated emission pumping experiments were carried out on vibronic levels associated with the ν3 vibration with 1≤v3≤3 in the electronic ground state. Harmonic and anharmonic constants were determined, together with the spin–orbit coupling parameters and rotational constants for these levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462426
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