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  • 1
    Electronic Resource
    Electronic Resource
    Selective population of spin–orbit levels in the autoionization of a polyatomic molecule: Branching ratios and asymmetry parameters for the Tanaka–Ogawa Rydberg series in CO2 (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 8768-8779 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The spin–orbit selectivity of angle-resolved photoelectron spectra was used to provide new information on the electronic structure, symmetry, and decay dynamics of members of the autoionizing Tanaka–Ogawa Rydberg series in CO2. This represents the first time that spin–orbit selectivity has been used to obtain such information for a polyatomic molecule. The spin–orbit photoelectron branching ratios were used to show that the angular momentum quantum number λ of the excited Rydberg electron does not change upon autoionization. Furthermore, a consideration of the present results together with previous calculations of the relative intensities of the discrete and continuum ionization channels shows that the most probable electron configuration for the Tanaka–Ogawa Rydberg series is ...(πu)3(πg)4ndδg and that autoionization proceeds primarily via a dδg→εfδu process for the totally symmetric vibronic components of the ion. The asymmetry parameter β was determined for individual spin–orbit components of the various vibronic bands of the X˜ 2Πg state and is discussed in terms of recent theoretical calculations. The Rydberg series appears to be well described by Ωcω coupling, even for relatively low principal quantum numbers. The general utility of this technique for autoionizing Rydberg states and its extension to multiphoton ionization of Rydberg states that lie below the first ionization threshold are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466731
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  • 2
    Electronic Resource
    Electronic Resource
    Multichannel boxcar-averaged measurements of plasma parameters made using a digital storage scope (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1081-1084 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We present a technique for rapidly acquiring time-resolved, ensemble-averaged Langmuir probe characteristics. Fifty probe characteristics are acquired using a digital storage oscilloscope in the time it would take to acquire a one-probe characteristic using a single-channel boxcar averager. A single Langmuir probe is used, and the probe bias is swept quite slowly, so that the probe is always in equilibrium with the plasma. A method for the automatic extraction of electron temperature, electron density, and the plasma potential from the acquired probe characteristics is described. This technique for acquisition and analysis is applied to the study of plasma decay and the effects of rf excitation in a pulsed, strongly magnetized plasma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139730
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  • 3
    Electronic Resource
    Electronic Resource
    Resonance effects in the 5σ−1 photoionization channel of CO (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 7433-7439 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vibrational branching ratios and photoelectron angular distributions are reported for the 5σ−1 photoionization channel of CO in the range 16 eV〈hν〈45 eV. Striking non-Franck–Condon effects are observed in both the branching ratios and angular distributions as a result of various autoionizing states and a σ shape resonance that lie in this spectral range. The goal of the present measurement was to observe definitive evidence for the σ shape resonance via its non-Franck–Condon effects on the vibrational ionization channels. Guided by recent calculations [Smith, Lynch, and McKoy, J. Chem. Phys. 85, 6455 (1986)], we examined the broad structure in the vibrational branching ratios and angular distributions in the range 25 eV 〈hν〈40 eV. There, we found clear evidence for the σ shape resonance in the quantities β(v+=0 and 1) and σ(v+=2)/σ(v+=0). Substantial differences between theory and experiment for the σ(v+=1)/σ(v+=0) branching ratio, however, serve to define the limitations of the current single-channel picture for this process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462393
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  • 4
    Electronic Resource
    Electronic Resource
    Vibrationally resolved photoelectron angular distributions and branching ratios for the carbon dioxide molecule in the wavelength region 685–795 A(ring) (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 3923-3934 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Measurements of vibrational branching ratios and photoelectron angular distributions have been made in the regions of the Tanaka-Ogawa, Lindholm, and Henning series for the CO2 molecule. The behavior of these parameters was found to be sensitive to which particular resonance is excited, with considerable intensity going into vibrational modes other than the symmetric stretch. An initial analysis of some of the data taken is presented. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471249
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  • 5
    Electronic Resource
    Electronic Resource
    Histopathology and prevalence of epidermal papillomas epidemic in brown bullhead, Ictalurus nebulosus (Lesueur), and white sucker, Catostomus commersoni (Lacépède), populations from Ontario, Canada (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 12 (1989), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract. White sucker, Catostomus commersoni (Lacépède), and brown bullhead, Ictalurus nebulosus (Lesueur), populations throughout the Great Lakes examined for evidence of pollution associated neoplasia exhibited a variety of morphologically distinct skin lesions. Three types of skin lesions affected white suckers: (a) focal on the lips, (b) discrete on the body, or (c) raised mucoid focal lesions on the skin and fins. Histologically, all three types featured a continuum between mild epidermal hyperplasia and benign papillomata. Brown bullheads exhibited a single variably shaped raised lesion on all body surfaces and within the oral cavity in addition to focal lip lesions. All bullhead lesions exhibited a continuum between mild epithelial hyperplasia and papillomata. Some skin lesions in both species were invasive but most abnormalities represented some stage in the development of epidermal papillomas. These papillomas superficially resemble papillomas common in many fish species and which are associated with viruses, but sucker and bullhead papillomas exhibit a unique range of histopathological and gross morphological appearances. The high prevalence of these papillomas, affecting up to 60% of some populations in polluted areas, supports the possibility that carcinogenic chemicals in the sediments are influencing papilloma development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1989.tb00326.x
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  • 6
    Electronic Resource
    Electronic Resource
    Alterations in iron, zinc and major plasma proteins of rainbow trout, Oncorhynchus mykiss (Walbaum), and brook trout, Salvelinus fontinalis (Mitchill), with sterile peritonitis induced by oil-adjuvanted multivalent bacterin vaccination (1999)
    Oxford, UK : Blackwell Science, Ltd
    Journal of fish diseases 22 (1999), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The early humoral responses of rainbow trout, Oncorhynchus mykiss (Walbaum), and brook trout, Salvelinus fontinalis (Mitchill), with sterile inflammation induced by intraperitoneal Lipogen Triple vaccination were compared to determine if genetic differences in susceptibility to furunculosis in salmonids correlated with different acute phase responses to vaccination. Similar severe acute sterile peritonitis occurred in response to Lipogen Triple in both species. Both species also had a rapid transient reduction in plasma iron concentration at 3 days. Moderate hypoferraemia persisted to day 14 in brook trout, but returned to normal by day 7 in rainbow trout. Plasma zinc decreased sharply 3 days after vaccination in rainbow trout and returned nearly to control levels by day 10; however, plasma zinc did not change in brook trout. Two-dimensional sodium dodecyl sulphate polyacrylamide electrophoresis of plasma proteins revealed that increased amounts of a 48-kDa protein group coincided with the hypoferraemic response in rainbow trout. In addition, a modest elevation in a 16-kDa protein group also occurred in rainbow trout. These studies demonstrated the rapid changes in plasma iron in both species and mild elevation of two putative acute phase plasma proteins associated with vaccine-induced inflammation in rainbow trout.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2761.1999.00142.x
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  • 7
    Electronic Resource
    Electronic Resource
    Influences of Aeromonas salmonicida lipopolysaccharide, prednisolone and water temperature on plasma protein composition in salmonids (1999)
    Oxford, UK : Blackwell Science, Ltd
    Journal of fish diseases 22 (1999), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: To further characterize the putative role of constitutive and inducible plasma proteins in innate resistance to furunculosis, the present authors compared the alterations in profiles of plasma proteins in resistant and susceptible salmonids, i.e. rainbow trout, Oncorhynchus mykiss (Walbaum), and brook trout, Salvelinus fontinalis (Mitchill), respectively. Rainbow trout were injected with prednisolone acetate and exposed to higher water temperature (18 °C versus 10 °C), or injected with purified lipopolysaccharide (LPS) from a virulent strain of Aeromonas salmonicida, and plasma components were examined by two-dimensional polyacrylamide electrophoresis. Two days after A. salmonicida LPS exposure, rainbow trout had a four- to five-fold increase in concentrations of plasma proteins composed of p48, p19 and p16 subunits, and a significant decrease in a 100-kDa protein group. Consistent elevation or depletion of proteins corresponding to previously reported rainbow trout A. salmonicida LPS-binding pentraxins and lectins in plasma were not observed. Brook trout exposed to A. salmonicida LPS did not have any consistent plasma protein changes. There were no significant alterations in major plasma proteins following temperature shock and prednisolone acetate administration in rainbow trout plasma. These studies demonstrate that rainbow trout with LPS-induced sterile inflammation have few alterations in major plasma proteins or LPS-binding proteins, and do not exhibit the spectrum of acute phase changes induced by inflammation in mammals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2761.1999.00144.x
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  • 8
    Electronic Resource
    Electronic Resource
    Temporal evolution of the electron distribution function in an electron cyclotron resonant discharge (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5306-5313 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present time-resolved experimental measurements of the electron distribution function f(v(parallel),v⊥,t) in a pulsed, partially ionized, electron cyclotron resonance (ECR)-produced plasma. The discharge has some characteristics similar to those used in plasma processing applications. These properties include ECR production in a strong magnetic field and low electron temperature (Te〈5 eV). In addition, electron-neutral collisions play an important role. A novel analyzer is used to study the dependence of f(v(parallel),v⊥,t) on velocities both parallel and perpendicular to the magnetic field. This information cannot be obtained with a simple Langmuir probe. The temporal evolution of f(v(parallel),v⊥,t) is examined during plasma formation, with the source biased, with the source grounded and in the afterglow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350240
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  • 9
    Electronic Resource
    Electronic Resource
    Shape-resonance-enhanced continuum–continuum coupling in photoionization of CO2 (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 1556-1563 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have measured photoionization branching ratios and photoelectron asymmetry parameters for photoionization of CO2 leading to the first four electronic states of CO2+ over the photon energy range from 20 to 50 eV. The motivation for this work was the prediction by Lucchese [J. Chem. Phys. 92, 4203 (1990)] that the σu shape resonance in the (4σg)−1 C˜ 2Σg+ ionization channel would influence the photoionization dynamics in the other valence-shell continua through continuum–continuum channel interaction, with the main effect occurring in the (3σu)−1 B˜ 2Σu+ channel. Indeed, clear evidence for this phenomenon is observed in this channel, the most prominent indication being a broad, shallow minimum in the asymmetry parameter at ∼40 eV. Comparisons of the present results with theory and other measurements reflect good overall agreement and provide some guidance regarding the effectiveness of alternative approximations used in the theoretical calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465324
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  • 10
    Electronic Resource
    Electronic Resource
    Vibrational autoionization in H2: Vibrational branching ratios and photoelectron angular distributions near the v+=3 threshold (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 7911-7917 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vibrational branching ratios and photoelectron angular distributions are reported for photoionization of normal (the equilibrium ortho/para mixture) hydrogen in the region just above the v+=3 ionization limit. This region contains a number of vibrationally autoionizing Rydberg states, and the goal of the work was to observe experimentally the characteristic behavior associated with the decay of these states that was predicted by Raoult and Jungen [J. Chem. Phys. 74, 3388 (1981)] on the basis of an MQDT (multichannel quantum defect theory) calculation on para-H2 (J‘=0). We have indeed observed that vibrational autoionization strongly favors the ionization channel representing the minimum change in the vibrational state of the ion core, as predicted. We also observed a sharp reduction in the photoelectron asymmetry of the v+=3 (and, to a lesser extent, the v+=2) ionization channel for resonant photoionization. Hence, qualitative agreement with theory is observed; however, a quantitative comparison now requires an extended calculation that includes the additional rotational levels that were populated under the present experimental conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463466
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