2,490 research outputs found
Harmonic generation of noble-gas atoms in the Near-IR regime using ab-initio time-dependent R-matrix theory
We demonstrate the capability of ab-initio time-dependent R-matrix theory to
obtain accurate harmonic generation spectra of noble-gas atoms at Near-IR
wavelengths between 1200 and 1800 nm and peak intensities up to 1.8 X 10(14)
W/cm(2) . To accommodate the excursion length of the ejected electron, we use
an angular-momentum expansion up to Lmax = 279. The harmonic spectra show
evidence of atomic structure through the presence of a Cooper minimum in
harmonic generation for Kr, and of multielectron interaction through the giant
resonance for Xe. The theoretical spectra agree well with those obtained
experimentally.Comment: 6 pages, 5 figure
ΠΠΎΠΌΠΏΠΎΠ·ΠΈΡΠΈ ΡΠΊ ΠΎΠ΄Π½Π΅ Π· ΠΎΡΠ½ΠΎΠ²Π½ΠΈΡ Π΄ΠΆΠ΅ΡΠ΅Π» ΡΠΎΠ·Π²ΠΈΡΠΊΡ Ρ Π·Π±Π°Π³Π°ΡΠ΅Π½Π½Ρ ΡΠ»ΠΎΠ²Π½ΠΈΠΊΠΎΠ²ΠΎΠ³ΠΎ ΡΠΊΠ»Π°Π΄Ρ Π°Π½Π³Π»ΡΠΉΡΡΠΊΠΎΡ ΠΌΠΎΠ²ΠΈ (Π½Π° ΠΌΠ°ΡΠ΅ΡΡΠ°Π»Π°Ρ Π±ΡΠΈΡΠ°Π½ΡΡΠΊΠΎΠ³ΠΎ Π½Π°ΡΡΠΎΠ½Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΊΠΎΡΠΏΡΡΡ ΡΠ΅ΠΊΡΡΡΠ² (BNC)
Π£ ΡΡΠ°ΡΡΡ ΡΠΎΠ·Π³Π»ΡΠ½ΡΡΠΎ ΠΎΡΠ½ΠΎΠ²Π½Ρ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΡΠ² ΡΠΊ ΠΏΡΠΎΠ΄ΡΠΊΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΡΠΏΠΎΡΠΎΠ±Ρ ΡΠ»ΠΎΠ²ΠΎΡΠ²ΠΎΡΠ΅Π½Π½Ρ, ΠΏΡΠΎΠ°Π½Π°Π»ΡΠ·ΠΎΠ²Π°Π½ΠΎ ΡΡΠ·Π½Ρ ΠΏΡΠ΄Ρ
ΠΎΠ΄ΠΈ Π΄ΠΎ ΠΊΠ»Π°ΡΠΈΡΡΠΊΠ°ΡΡΡ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ° ΡΠΊ ΡΠ΅Π½ΠΎΠΌΠ΅Π½Ρ, ΠΏΠΎΠ΄Π°Π½ΠΎ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΈ Π»ΡΠ½Π³Π²ΡΡΡΠΈΡΠ½ΠΎΠ³ΠΎ Π΄ΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½Π½Ρ Π³ΡΠ°ΡΡΡΠ½ΠΎΠ³ΠΎ Π·ΠΎΠ±ΡΠ°ΠΆΠ΅Π½Π½Ρ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΡΠ² ΡΠ° ΡΠ°ΡΡΠΎΡΠ½ΠΎΡΡΡ ΡΡ
Π²ΠΈΠΊΠΎΡΠΈΡΡΠ°Π½Π½Ρ Π² ΡΡΡΠ°ΡΠ½ΠΎΡ Π°Π½Π³Π»ΡΠΉΡΡΠΊΠΎΡ ΠΌΠΎΠ²Ρ (Π½Π° ΠΌΠ°ΡΠ΅ΡΡΠ°Π»Π°Ρ
ΠΡΠΈΡΠ°Π½ΡΡΠΊΠΎΠ³ΠΎ Π½Π°ΡΡΠΎΠ½Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΊΠΎΡΠΏΡΡΡ ΡΠ΅ΠΊΡΡΡΠ² (BNC). ΠΠΈΠ΄ΡΠ»Π΅Π½ΠΎ ΠΎΡΠ½ΠΎΠ²Π½Ρ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ Π΅Π½Π΄ΠΎΡΠ΅Π½ΡΡΠΈΡΠ½ΠΈΡ
ΡΠ° Π΅ΠΊΠ·ΠΎΡΠ΅Π½ΡΡΠΈΡΠ½ΠΈΡ
ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΡΠ².Π ΡΡΠ°ΡΡΠ΅ ΡΠ°ΡΡΠΌΠΎΡΡΠ΅Π½Ρ ΠΎΡΠ½ΠΎΠ²Π½ΡΠ΅ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ° ΠΊΠ°ΠΊ ΠΏΡΠΎΠ΄ΡΠΊΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΡΠΏΠΎΡΠΎΠ±Π° ΡΠ»ΠΎΠ²ΠΎΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΡ, ΠΏΡΠΎΠ°Π½Π°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Ρ ΡΠ°Π·Π½ΡΠ΅ ΠΏΠΎΠ΄Ρ
ΠΎΠ΄Ρ ΠΊ ΠΊΠ»Π°ΡΡΠΈΡΠΈΠΊΠ°ΡΠΈΠΈ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ° ΠΊΠ°ΠΊ ΡΠ΅Π½ΠΎΠΌΠ΅Π½Π°, ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ Π»ΠΈΠ½Π³Π²ΠΈΡΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Π³ΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈΠ·ΠΎΠ±ΡΠ°ΠΆΠ΅Π½ΠΈΡ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠΎΠ² ΠΈ ΡΠ°ΡΡΠΎΡΠ½ΠΎΡΡΠΈ ΠΈΡ
ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ Π² ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΌ Π°Π½Π³Π»ΠΈΠΉΡΠΊΠΎΠΌ ΡΠ·ΡΠΊΠ΅ (Π½Π° ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π°Ρ
ΠΡΠΈΡΠ°Π½ΡΠΊΠΎΠ³ΠΎ Π½Π°ΡΠΈΠΎΠ½Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΊΠΎΡΠΏΡΡΠ° ΡΠ΅ΠΊΡΡΠΎΠ² (BNC). ΠΡΠ΄Π΅Π»Π΅Π½Ρ ΠΎΡΠ½ΠΎΠ²Π½ΡΠ΅ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ ΡΠ°ΠΊ Π½Π°Π·ΡΠ²Π°Π΅ΠΌΡΡ
ΡΠ½Π΄ΠΎΡΠ΅Π½ΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈ ΡΠΊΠ·ΠΎΡΠ΅Π½ΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠΎΠ².The article examines the phenomenon of composite (compound) as the productive mean of word-formation. The different approaches to the classification of the phenomenon of composits in English are analyzed. The results of the linguistic research of the spelling of composites in Modern English are given (based on the British National Corpus (BNC). The spelling of English compounds depends on the complexity of their constituents. The relevant generalization seems to be that spellers tend to insert a space in compounds if any of its constituents is morphologically complex. In respect to the first constituent this tendency is particularly strong, so that solid compounds in English are overwhelmingly written with a monomorphemic first constituent. The exceptions to this generalization are not numerous and almost all can be accounted for in a principled way. The compound types which are easier to process are more frequent, and are also more often spelled solid. According to the proposed analysis of English compounds, solid compounds seem to differ from open compounds in four important features: spelling, morphological structure, and productivity
Quasiclassical double photoionization from the 2^{1,3}S excited states of helium including shakeoff
We account for the different symmetries of the 2^{1,3}S helium excited states
in a quasiclassical description of the knockout mechanism augmented by a
quantum shakeoff contribution. We are thus able to formulate the separate
contribution of the knockout and shakeoff mechanisms for double photoionization
for any excess energy from the 2^{1,3}S states. Photoionization ratios and
singly differential cross sections calculated for the 2^{1,3}S excited states
of helium are found to be in very good agreement with recent theoretical
results.Comment: 9 pages, 5 figure
Emission properties of YAG: Ce ceramics with barium fluoride flux
In this work, we investigated the luminescent properties of YAG, Ce ceramics with an addition of barium fluoride flux. The ceramic samples were sintered from obtained YAG: Ce, BaF2 phosphor powder. Morphological, luminescent and decay time characteristics of YAG: Ce ceramics were investigated. The luminescence decay kinetics analysis of the ceramics showed that the decay time in phosphors and ceramics is different in the visual spectral range
Monopole characteristics in various Abelian gauges
Renormalization group (RG) smoothing is employed on the lattice to
investigate and to compare the monopole structure of the SU(2) vacuum as seen
in different gauges (maximally Abelian (MAG), Polyakov loop (PG) and Laplacian
gauge (LG)). Physically relevant types of monopoles (LG and MAG) are
distinguished by their behavior near the deconfining phase transition. For the
LG, Abelian projection reproduces well the gauge independent monopole structure
encoded in an auxiliary Higgs field. Density and localization properties of
monopoles, their non-Abelian action and topological charge are studied. Results
are presented confirming the Abelian dominance with respect to the
non-perturbative static potential for all gauges considered.Comment: 36 pages, 12 figure
Differences in trauma history and psychopathology between PTSD patients with and without co-occurring dissociative disorders
Wabnitz P, Gast U, Catani C. Differences in trauma history and psychopathology between PTSD patients with and without co-occurring dissociative disorders. European Journal of Psychotraumatology. 2013;2013(4): 21452.Background: The interplay between different types of potentially traumatizing events, posttraumatic symptoms, and the pathogenesis of PTSD or major dissociative disorders (DD) has been extensively studied during the last decade. However, the phenomenology and nosological classification of posttraumatic disorders is currently under debate. The current study was conducted to investigate differences between PTSD patients with and without co-occurring major DD with regard to general psychopathology, trauma history, and trauma-specific symptoms.
Methods: Twenty-four inpatients were administered the Clinician-Administered PTSD Scale for DSM-IV (CAPS) and the Mini-Structured Clinical Interview for DSM-IV Dissociative Disorders (MINI-SKID-D) to assess DD and PTSD. Additionally, participants completed questionnaires to assess general psychopathology and health status.
Results: Symptom profiles and axis I comorbidity were similar in all patients. Traumatic experiences did not differ between the two groups, with both reporting high levels of childhood trauma. Only trauma-specific avoidance behavior and dissociative symptoms differed between groups.
Conclusion: Results support the view that PTSD and DD are affiliated disorders that could be classified within the same diagnostic category. Our results accord with a typological model of dissociation in which profound forms of dissociation are specific to DD and are accompanied with higher levels of trauma-specific avoidance in DD patients
Photoelectron Angular Distributions for Two-photon Ionization of Helium by Ultrashort Extreme Ultraviolet Free Electron Laser Pulses
Phase-shift differences and amplitude ratios of the outgoing and
continuum wave packets generated by two-photon ionization of helium atoms are
determined from the photoelectron angular distributions obtained using velocity
map imaging. Helium atoms are ionized with ultrashort extreme-ultraviolet
free-electron laser pulses with a photon energy of 20.3, 21.3, 23.0, and 24.3
eV, produced by the SPring-8 Compact SASE Source test accelerator. The measured
values of the phase-shift differences are distinct from scattering phase-shift
differences when the photon energy is tuned to an excited level or Rydberg
manifold. The difference stems from the competition between resonant and
non-resonant paths in two-photon ionization by ultrashort pulses. Since the
competition can be controlled in principle by the pulse shape, the present
results illustrate a new way to tailor the continuum wave packet.Comment: 5 pages, 1 table, 3 figure
ΠΠ»ΠΈΡΠ½ΠΈΠ΅ ΡΠ΅Π·ΠΎΠ½Π½ΠΎΡΡΠΈ Π³Π°Π·ΠΎΠΏΠΎΡΡΠ΅Π±Π»Π΅Π½ΠΈΡ Π½Π° ΠΏΠ»Π°Π½ΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΠΎΠ±ΡΠ΅ΠΌΠΎΠ² ΠΏΠ΅ΡΠ΅ΠΊΠ°ΡΠΊΠΈ ΠΏΡΠΈΡΠΎΠ΄Π½ΠΎΠ³ΠΎ Π³Π°Π·Π° ΠΏΠΎ ΠΌΠ°Π³ΠΈΡΡΡΠ°Π»ΡΠ½ΡΠΌ Π³Π°Π·ΠΎΠΏΡΠΎΠ²ΠΎΠ΄Π°ΠΌ
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