| 1. |
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| 2. |
- Hedin, Lars, et al.
(författare)
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Local exchange-correlation potentials
- 1971
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Ingår i: Solid State Communications. - : Elsevier BV. - 1879-2766 .- 0038-1098. ; 9:9, s. 537-541
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Tidskriftsartikel (refereegranskat)abstract
- Recent advances in the many-body theory of electrons in solids and in the theory of the interacting electron gas are used to construct explicit local effective potentials which incorporate the effects of correlation and exchange. For ground state properties we consider the scheme by Hohenberg, Kohn and Sham and provide data for the effective potential μxc. For excitation energies the corresponding potential Vxc is obtained from the self-energy of an electron gas and numerical data are provided for the construction of Vxc.
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| 3. |
- Hedin, Lars
(författare)
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Many-body effects in soft X-ray emission in metals
- 1967
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Ingår i: Solid State Communications. - : Elsevier BV. - 1879-2766 .- 0038-1098. ; 5:6, s. 451-454
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Tidskriftsartikel (refereegranskat)abstract
- Soft X-ray emission in metals is treated, taking many-body effects and the electron-hole attraction into account. An appropriate connection with electron gas results is made. The structure in the low energy tail due to many-body effects are discussed, and the existence of a new critical point is suggested.
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| 4. |
- Hedin, Lars, et al.
(författare)
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New structure in the single-particle spectrum of an electron gas
- 1967
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Ingår i: Solid State Communications. - : Elsevier BV. - 1879-2766 .- 0038-1098. ; 5:4, s. 237-239
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Tidskriftsartikel (refereegranskat)abstract
- Calculations of the one-electron Green's function give a single-particle spectrum where, besides the usual quasi-particles, a new peak of appreciable strength appears which corresponds to an electron coupled to real plasmons.
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| 5. |
- von Barth, Ulf, et al.
(författare)
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The effect of the core hole on X-ray emission spectra in simple metals
- 1979
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Ingår i: Solid State Communications. - : Elsevier BV. - 1879-2766 .- 0038-1098. ; 32:8, s. 645-649
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Tidskriftsartikel (refereegranskat)abstract
- Shows that one-particle calculations of X-ray spectra with and without the core hole can give drastically different results, indicating a breakdown of one-particle theory. Only emission spectra obtained in the absence of the core hole consistently show a close resemblance to experiment. The authors show, that this fact can be explained by the many-body theory of Nozieres and DeDominicis (1969). They are then able to give the first interpretation of the L2,3 satellite spectrum of sodium.(17 refs)
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| 6. |
- Andersson, Göran, et al.
(författare)
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Pressure dependence of the c-axis resistance of stage 2 SbCl5 intercalated graphite to 4 GPa
- 1988
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Ingår i: Solid State Communications. - : Elsevier BV. - 0038-1098 .- 1879-2766. ; 65:7, s. 735-738
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Tidskriftsartikel (refereegranskat)abstract
- The c-axis electrical resistance R has been measured under pressure up to 4 GPa (40 kbar) at room temperature for stage 2, HOPG-based SbCl5 intercalated graphite. In addition to the well known ordering transition at 0.3–0.5 GPa a second anomaly in R is observed above 1 GPa, corresponding to a further phase transition which is not completed until above 2.4 GPa. In all phases R depends more strongly on p for the intercalated material than for HOPG, and the total decrease in R is over 80% to 4 GPa.
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| 7. |
- Andersson, Ove, et al.
(författare)
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Thermal conductivity of low-density amorphous ice
- 1994
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Ingår i: Solid State Communications. - : Elsevier. - 0038-1098 .- 1879-2766. ; 91:12, s. 985-988
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Tidskriftsartikel (refereegranskat)abstract
- The thermal conductivity λ of low-density amorphous ice was measured using the transient hot-wire method in the temperature range 70–135 K at a pressure of 0.1 GPa. The amorphous state was formed at 135 K by pressurising hexagonal ice up to about 1 GPa. The results for λ are roughly temperature and pressure independent and in magnitude about 0.6 W m−1 K−1, which is roughly equal to λ for water. These results for λ of amorphous ice are several orders of magnitude larger than those reported recently for a specimen prepared by a vapour deposition technique.
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| 8. |
- Anderssson, Magnus, et al.
(författare)
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NEUTRON-DIFFRACTION STUDIES OF INTERATOMIC DISTANCES IN THE Y1-2XCAXTHXBA2CU3O7-DELTA SYSTEM
- 1992
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Ingår i: Solid State Communications. - 0038-1098 .- 1879-2766. ; 81:5, s. 425-429
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Tidskriftsartikel (refereegranskat)abstract
- Neutron diffraction studies have been performed for three samples of Y(1-2x)Ca(x)Th(x)Ba2Cu3O7-delta with 0 less-than-or-equal-to x less-than-or-equal-to 0.1. With increasing x, a decreased puckering of the Cu-O planes is found. Changes in copper oxygen distances are generally small. Evidence is found for a small increase in the distance between Cu(1) and O(4) (on the cell edge) with increased CaTh concentration. An increased oxygen disorder is observed at x = 0.1.
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| 9. |
- Bohlin, Leif, et al.
(författare)
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A comment on the thermal conductivity of insulating solids at high pressures
- 1974
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Ingår i: Solid State Communications. - : Elsevier. - 0038-1098 .- 1879-2766. ; 14:8, s. 711-714
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Tidskriftsartikel (refereegranskat)abstract
- The effect of pressure on the thermal conductivity has been investigated theoretically fo atomic and polymeric solids. Specific numerical results are given and are compared with experiments for KCl, NaCl and AgCl and for polytetrafluoroethylene and low- and high-density polyethylene. We find the ratio of theory and experiment to be 1.5, 1.9 and 3.0 for the alkali halides, the ratio increases with increasing mass ratio. Corresponding values for the polymers are 1.0, 1.4 and 0.9.
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| 10. |
- Bonde, Torben A., et al.
(författare)
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Microbial biomass as a fraction of potentially mineralizable nitrogen in soils from long-term field experiments
- 1988
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Ingår i: Soil Biology and Biochemistry. - : Elsevier. - 0038-0717 .- 1879-3428. ; 20:4, s. 447-452
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Tidskriftsartikel (refereegranskat)abstract
- Aerobic long-term incubations (40-wk) were employed to measure the potentially mineralizable nitrogen (N0) in five 30-yr old cropping systems. The cropping systems consisted of: (1) bare fallow; (2) cropping with no additions; (3) cropping with 80 kg N ha-1 y-1 as Ca(NO3)2; (4) cropping with 80 kg N ha-1 yr-1 as Ca(NO3)2 plus 1800kg C ha-1 yr-1 as straw; and (5) cropping with 80 kg N ha-1 yr-1 plus 1800 kg C ha-1 yr-1 as farmyard manure. The amounts of N mineralized during the 40-wk incubations were between 93 and 168 μg g-1 (302-543 kg N ha-1 down to 25cm depth) with the lowest value for the fallow and the highest for the farmyard manure treatment. Microbial biomass-C and -N were measured on four occasions during the incubations. The biomass-C showed a rapid decrease to week 4 (to 36% of the initial mass), a slower decrease to week 9 (to 23% of initial mass) and a very slow decline to the final determination at the end of the incubation (to 8% of initial mass). The biomass-N displayed a similar pattern. Two related models were employed to describe the kinetics of N-mineralization during incubation: (1) a two-component first-order; and (2) a simplified special case of the two-component model. In all cases except the straw-amended soil, the simplified two-component model offered the best description of the curves of accumulated mineral-N. The available fraction, Na, of soil organic-N had mineralization rate constants similar to those for mineralization of microbial biomass.
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