Volume 19, Issue 1, January 1990
Index of content:
19(1990); http://dx.doi.org/10.1063/1.555877View Description Hide Description
This publication contains evaluated and estimated data on the kinetics of reactions involving isobutane, t‐butyl radical and isobutyl radical and various small inorganic and organic species which are of importance for the proper understanding of isobutane combustion and pyrolysis. It is meant to be used in conjunction with the kinetic data given in earlier publications, which is of direct pertinence to the understanding of methane, ethane, methanol and propanepyrolysis and combustion, but which also contains a large volume of data that are applicable to the isobutane system. The temperature range covered is 300–2500 K and the density range 1×101 6 to 1×102 1 molecules cm− 3.
19(1990); http://dx.doi.org/10.1063/1.555873View Description Hide Description
The complete thermodynamic functions for MgO are presented for the temperature range 300–2000 K and the pressure range 0–150 GPa, both as tables and as graphs. Careful attention is given to the temperature and pressure dependence of the coefficient of thermal expansion α and the isothermal bulk modulusK T , which are the major corrections to the thermodynamic functions in extreme conditions. Our equations efficiently use the fact that the product αK T varies only slightly with either temperature or with volume, although scrupulous care is taken to account for the actual numbers. The corrections are now possible due to recent measurements of the bulk modulus up to 1800 K. The Birch–Murnaghan equation of state is used to account for certain terms in the expressions for internal energy and enthalpy. The parameters used in the Birch–Murnaghan equation of state are given as functions of temperature. The parameters which presently limit the calculations of thermodynamic functions to even higher temperatures and pressures and limit the applications of this method to other minerals are: (1) the uncertainty of the thermal expansivity at temperatures above 1500 K, and (2) the uncertainty of the temperature dependence of (∂K T /∂T) P at temperatures above 800 K.
19(1990); http://dx.doi.org/10.1063/1.555874View Description Hide Description
This review critically compiles all surface structures derived by ion‐scattering techniques reported in the refereed literature prior to January 1988. They are compared with the more extensive low‐energy electron diffractiondatabase reported previously [J. Phys. Chem. Ref. Data 1 6, 953 (1957)]. These investigations cover all types of surfaces including clean and adsorbate‐coveredmetal,semiconductor, and other nonmetallic substrates. The important experimental and theoretical aspects of such investigations have been extracted into easily understood tabular form supplemented by many figures and ancillary tables and complete references. It is hoped that this compilation will provide a valuable resource both for the surface science specialist and for those nonspecialists in other areas who need surface crystallographic data.
19(1990); http://dx.doi.org/10.1063/1.555869View Description Hide Description
The available experimental liquid‐phase thermal conductivity data for benzene have been examined with the intention of establishing a further liquid thermal conductivity standard along the saturation line. The quality of the available data is such that new standard reference values can be proposed with confidence limits better than ±1% for most of the normal liquid range.
19(1990); http://dx.doi.org/10.1063/1.555870View Description Hide Description
A new energy level table for Ali has been constructed to include hyperfine structure from observations within the last decade. Improvement in accuracy over older tables is about an order of magnitude. The analysis of high‐lRydberg levels utilizing the polarization formula results in a new value for the ionization potential which is 0.110 cm− 1 or five standard deviations above the old value.
19(1990); http://dx.doi.org/10.1063/1.555871View Description Hide Description
Wavelengths, energy levels, level classifications, oscillator strengths, and atomic transition probabilities of the ironions Fe viii to Fe xxvi are critically reviewed and tabulated. Grotrain diagrams are also presented to provide graphical overviews. The literature has been surveyed to March 1988.
19(1990); http://dx.doi.org/10.1063/1.555872View Description Hide Description
Cross sections for the excitation and ionization of atomic oxygen by electron impact are presented as the result of a critical review of experimental and theoretical work on this subject. An effort has been made to compile the most accurate and complete set of cross sections available. More than 60 profiles of excitation cross section versus electron‐impact energy are presented. These include transitions to the forbidden metastable O(2p 4 1 D) and O(2p 4 1 S) states, the allowed autoionizing O(2p 5 3 P o ) state, nine allowed Rydberg series, and twenty‐nine forbidden Rydberg series. Recommended ionization cross sections for transitions to the outer‐electron ionization states O+(4 S o ), O+(2 D o ), O+(2 P o ), to the inner‐electron ionization state O+(4 P), and to the O2 + state are also given. Many of these excitation and ionization cross sections are based on recently published laboratory measurements, and differ from previously accepted values by factors of ∼2–3, and in a few cases by up to a factor of 10. The data presented in this report will be useful in calculations of aeronomical and artificially‐induced electron impact on atomic oxygen, an important component of the upper atmosphere.