R. K. Pathria; Mathematical basis for Weissman’s approximation to n!, American Journal of physics, Volume 53, Issue 1, 1 January 1985, Pages 81–82, https://doi.
R. K. Pathria; Mathematical basis for Weissman’s approximation to n!, American Journal of physics, Volume 53, Issue 1, 1 January 1985, Pages 81–82, https://doi.
We have measured Auger electron emission from single crystal targets of Si(111) bombarded with H + and 4 He + beams in the 0.5 to 1.8 MeV range under channeled and random directions of incidence. Under channeling cond...
We have measured Auger electron emission from single crystal targets of Si(111) bombarded with H + and 4 He + beams in the 0.5 to 1.8 MeV range under channeled and random directions of incidence. Under channeling conditions (monitored by simultaneous measurement of the Rutherford backscattering yield), a significant reduction is observed in the intensity and also in the energy width of the KLL Auger line. These two characteristics of the Auger signal are influenced by channeled to random Auger signals correlates well with a simple model based on the shadow cone radius for the channeled ion, the lattice vibrational amplitude, the adiabatic K-shell excitation distance, and the electron inelastic mean free path, λ, for the 1620 eV Auger line. We derive a value for the latter quantity of 34 Å.
The structure factor for liquid chlorine on the coexistence curve at room temperature (296 K) was measured out to a q of 11 Å −1 using neutrons of 88 meV. The inelasticity correction to the differential scatterin...
The structure factor for liquid chlorine on the coexistence curve at room temperature (296 K) was measured out to a q of 11 Å −1 using neutrons of 88 meV. The inelasticity correction to the differential scattering cross section included terms due to the excitation of molecular vibrations which were important at large q . Comparisons were made to other published results for S ( q ) and some differences were noted, especially at low q and in the peak heights.
The distribution of interstellar extinction and early-type stars to A5 in the field (l, b) = (253°, −7°) has been studied toV∼ 12 mag. The space density of B5, B8–A0 and A2–A5 stars is normal for a field ...
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The distribution of interstellar extinction and early-type stars to A5 in the field (l, b) = (253°, −7°) has been studied toV∼ 12 mag. The space density of B5, B8–A0 and A2–A5 stars is normal for a field outside the galactic plane, following a relationship of the formψ(r) =ψ0exp [− (rsinb)/β], where (ψ0,β) = (2.1 × 10−5stars pc−3, 60 pc), (17 × 10−5, 90) and (22 × 10−5, 140) for the three stellar groups respectively. The stellar and extinction data indicate that the direction (l, b) = (253°, −7°) lies out of the matter plane of the Milky Way at least to 3 kpc,|$(\langle E(B-V)\rangle = 9.25 \enspace\text{mag})$|. However, the higher extinction of Bochum 15 (4.4kpc,|$\langle E(B-V)\rangle = 0.5$|) and the absence of background galaxies suggests the possible presence of the galactic warp at −7° at distances beyond ∼ 5 kpc (z∼ 0.6 kpc), as well as a total higher extinction than the maximum ofE(B–V) = 0.53 ford> 10 kpc found at (l, b) = (245°, 0°).
Raman and infrared spectra of polycrystalline cyanogen, C 2 N 2 , at 20 K are reported. Multiplet structure of the intramolecular fundamentals is observed and interpreted in terms of a group theoretical analysis based...
Raman and infrared spectra of polycrystalline cyanogen, C 2 N 2 , at 20 K are reported. Multiplet structure of the intramolecular fundamentals is observed and interpreted in terms of a group theoretical analysis based on the known orthorhombic crystal structure. Seven of the eight predicted librational and five of the predicted six translational modes are observed in the low-frequency regions of the Raman and infrared spectra, respectively.
作者：
Escudero, RobertoSmith, H.J.T.Univ of Waterloo
Guelph-Waterloo Program for Graduate Work in Physics Waterloo Ont Can Univ of Waterloo Guelph-Waterloo Program for Graduate Work in Physics Waterloo Ont Can
The superconducting recombination time has been measured for tin close to Tc. Current was injected via a tunnel junction into one side of a tin microbridge. With the smallest injection current the recombination time w...
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ISBN:
(纸本)0444869107
The superconducting recombination time has been measured for tin close to Tc. Current was injected via a tunnel junction into one side of a tin microbridge. With the smallest injection current the recombination time was 1. 08 multiplied by 10-9 sec. As the injection current was increased the recombination time was found to increase.
The results of scanning a finely collimated beam of 5.9 keV X-rays across the faces of three different Si(Li) X-ray detectors are interpreted in terms of an active area of good charge collection and peripheral regions...
The results of scanning a finely collimated beam of 5.9 keV X-rays across the faces of three different Si(Li) X-ray detectors are interpreted in terms of an active area of good charge collection and peripheral regions of incomplete charge collection, both within the manufacturers' stated areas. The data are correlated with absolute efficiencies determined using calibrated radionuclide X-ray ernitters. The hazards of spectral artefacts from the imperfect regions in the contexts of XRF and PIXE are stressed.
The dynamical behavior of the one-dimensional quantum sine-Gordon system with a misfit parameter is investigated at a particular value of the quantum parameterg2=4π. For this purpose the dynamical correlation functio...
The dynamical behavior of the one-dimensional quantum sine-Gordon system with a misfit parameter is investigated at a particular value of the quantum parameterg2=4π. For this purpose the dynamical correlation functions are calculated by using the Fermi-Bose relation. From the behavior of the displacement correlation function we find that the thermal velocity is given by ∼√T/m0in the commensurate state (m0-| µ 8730|≫T) or in the cross-over region (m0≃| µ \tilde |≫T) and approaches value 1 asTor | µ \tilde | is increased. Herem0and µ \tilde, respectively, are the gap and the chemical potential in the corresponding fermion system. For the case of denity-density correlation function, we give in the commensurate state expressions which are similar to those derived on the basis of the soliton phenomenology in the classical system. A particular case of the density-density correlation function is discussed in detail by following another route.
Raman and far-infrared spectra of polycrystalline samples of chloroform at 20 and 80 K are reported. Crystal field spilttings of the intramolecular fundamentals are observed as well as nine Raman and six infrared latt...
Raman and far-infrared spectra of polycrystalline samples of chloroform at 20 and 80 K are reported. Crystal field spilttings of the intramolecular fundamentals are observed as well as nine Raman and six infrared lattice modes. Spectra are interpreted in terms of a group theoretical analysis based on the molecular and crystal symmetries.
The dynamical correlation functions for the 1-D quantum sine-Gordon system withg2=4π are investigated analytically (g2is the quantum parameter). Following a microscopic approach using the fermibose relation, general ...
The dynamical correlation functions for the 1-D quantum sine-Gordon system withg2=4π are investigated analytically (g2is the quantum parameter). Following a microscopic approach using the fermibose relation, general expressions valid at all temperatures are derived. The high and low temperature limits of the correlation functions are given explicitly.
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