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  • Articles  (4)
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  • American Institute of Physics (AIP)  (4)
  • 1
    Electronic Resource
    Electronic Resource
    The equilibrium constant for N2O5(arrow-right-and-left)NO2+NO3: Absolute determination by direct measurement from 243 to 397 K (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 4997-5006 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The equilibrium constant for N2 O5 (arrow-right-and-left)NO2 +NO3 [reaction (1)], has been determined through direct concentration measurements of N2 O5, NO2, and NO3 in a temperature controlled long path cell, using absorption spectroscopy in the infrared and visible regions from 243 to 397 K. The results give K1C =1.30×1026 exp(−21 490/RT) molecules cm−3 with an estimated overall uncertainty of 30% at the 95% confidence level. This results in an equilibrium constant near room temperature approximately one-half that of previously accepted values. Using the temperature dependence of the equilibrium constant and new data for the enthalpy of formation of gaseous N2 O5 yields an enthalpy of formation for NO3 of 15.39±0.72 kcal mol−1. In additional experiments the temperature dependent first order decay rates of N2 O5 were determined from which a value for the product of the equilibrium constant (K1C ) and the rate constant for reaction (2): NO2 +NO3 →NO+NO2 +O2 was obtained for temperatures from 298 to 396 K: K1 k2 =1.23×1013 exp(−24 300/RT) s.−1 When this is combined with the equilibrium constant of the present study the following expression is obtained for k2 : 9.5×10−14 exp(−2810/RT) cm3 molecule−1 s.−1
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454679
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  • 2
    Electronic Resource
    Electronic Resource
    Detection statistics of deep levels in minority carrier transient spectroscopy (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 251-259 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theoretical treatment of the minority carrier transient spectroscopy (MCTS) experiment is presented. We have modeled the minority carrier flux through the depletion region of an illuminated Schottky diode held under reverse bias, and used these data to calculate the occupancy of minority carrier traps as a function of energy, capture cross section, and temperature. The model shows that the capacitance transient monitored in the MCTS experiment decreases in intensity as the temperature is raised. It is demonstrated that this causes inaccuracies in the measured deep level activation energy Ea derived from an Arrhenius plot of the data. Simulated MCTS spectra have been compared with measured MCTS spectra of hole emission from the gold donor in silicon, and very good agreement between modeled and experimental spectra is observed. The model explains the commonly observed phenomenon of a reduction in MCTS peak heights for increasing temperature, which is the opposite effect from that commonly observed in conventional deep level transient spectroscopy data. It is shown that the correct choice of rate window can significantly reduce errors in the measured value of Ea. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363991
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  • 3
    Electronic Resource
    Electronic Resource
    Temperature variable long path cell for absorption measurements (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 1427-1428 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A long path cell has been designed and constructed for absorption measurements at temperatures ranging from 215 to 470 K and at pressures from vacuum to 10 atm. It enables us to measure temperature and pressure dependence of the spectra and reaction rates of gases of atmospheric interest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139426
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  • 4
    Electronic Resource
    Electronic Resource
    Strongly enhanced Tb luminescence from titania xerogel solids mesoscopically confined in porous anodic alumina (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 1006-1008 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report strongly enhanced Tb photoluminescence (PL) from a doped titania xerogel deposited on mesoporous anodic alumina. Transmission electron microscopy has confirmed the presence of the xerogel inside the pores of alumina films of up to several microns thickness. The optical bands attributed to 5D3→7Fi (i=3,4,5), 5D4→7Fj (j=3,4,5,6) transitions of Tb3+, with a predominant band at 2.28 eV, are investigated between 6 and 300 K. At all temperatures, the Tb PL increases and the bands become narrower with an increase in the Tb concentration in the xerogel, the number of deposited layers employed and the thickness of the porous alumina film. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125921
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