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Articles you may be interested inElectronic states of monatomic layers of alkali and rare earth metals adsorbed on graphene surfaces Low Temp.An analytical model is described in which the time-averaged charge of adsorbed particles is a function of the energy of transition between atomic and ionic states, as in a thermally ionized gas. This relation is used to determine the dipole moment of the adsorbed layer, including the effect of depolarization by adjacent charges. An expre~sion is ob~ained which relates the emission properties to the temperature, degree of surface coverage, and ?aslc 'pr~pertle~ of the :ubst:ate and adsorbate. Through estimation of the atom adsorption energy, a relatIOnship IS obtamed whIch gIVes a good correlation of most available data for the emission properties of surfaces immersed in cesium vapor.

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This retrospective, single-center study evaluated the outcomes of orbital and rotational atherectomy treatment for heavily calcified coronary bifurcation lesions as compared to non-bifurcation lesions. The results demonstrate that atherectomy treatment in patients with heavily calcified coronary bifurcation lesions is feasible, resulting in similarly low 30-day MACE rates as compared to patients with non-bifurcation lesions. In addition, in this study OAS utilization versus RA in bifurcation lesions was associated with significantly shorter procedure and fluoroscopy time.

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ACKNOWLEDGMENT 16Calculation of AO(eT) 19Summary 2:5References 27 IV Space Charge Analysis for Low Pressure ThermionicDiodes (Warner) P-8 introduction 28The in that report the ideal converter performance was der-ined and the details of the fundamental efissiaon processes were analyzed and related to the recuirements for ideal converter operation. This thereby provided an extensive analysi8 of emission-limited converter operation.The continuation of the proerran, the results of which are included in the present report, extends some of the theories of the emission processes, but emphasizes the processes occurring in the interelectrode space and the relation and importance of the emission characteristics on the transport effects. The work of this year, therefore, represents a logical extension of the earlier work in that the knowledge of the emission processes is coup~led with studies of the transport processes in order to effect a more complete understanding of thermionic energy conversion. The results are summarized in the following section. The remainder of the report consists of detailed articles on problems investigated during the past year.Predominzajtly, the conventions used in this report are those proposed for the 1962 Colorado Springs Symposium on Thermionic Power Conversion.When the discussion is directly related to gaseous discharges or vacuum electronics, however, and when extensive reference is made to published A!"7979 1 Ii. SUMMARY OF RESULTSSome of the work of the past year has been a continuation of the study 6f emission phenomena and the emisSion6limited thermionic converter. The resutrS of this study are discussed in Section III.Results of the studies of the transport processes and the interaction of emission and transport effects ar discussed in Sections IV, V, VI and VII. The inclusion of the effects of adatoms has shown that a major effect in expla~ning the maximum in the work function change may be due to the polarizability of the adatoms. Furthermore, at large coverages where this theory is inadequate, the lateral bonding of the cesium and possible accom- AI-79793 panying effects such as changes in polarizability may also be extremely important. SPACE CHARGE ANALYSIS FOR LOW PRSSUE THE11IONIC DI0DESA space charge analysis of a collisionless, plane electrode thermionic converter has been performed. With, both ions and electrons emitted, the potential distributions can assume a variety of forms. This report Completely systematizes these SlUtioinsiThe space charge problem is first considered for infinite spacing, and the potential distributions are Characterized by the collector potential and the potential at which the electric field first vanishes. For a given emitted ion-to-electron ratio, the diode ion and electron currents are easily extracted as a function of collector potential, and thus the volt-ampere curve can be plotted. The resulting volt-ampere characteristics extend continuously from minus infinity to plus infinity, so that the load line always yields an operating point. he ptes...

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The differential cross sections for the excitation of the n = 2 states of atomic hydrogen by high-energy-resolution electron impact have been measured at scattering angles of 33", 54", 70" and 90" over the energy range 11.5 to 12.2 eV, allowing the Feshbach resonances below the n = 3 inelastic threshold to be studied. The lowest six of these resonances have been identified as 'S, 3P, 'D, 'P, 3F and 3S/3D respectively, using the classifications of Callaway. At higher energies, the 3P, 'D and 'S states have been tentatively identified. All measured energies agree well with those of Callaway.