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  • 1
    Digitale Medien
    Digitale Medien
    Abdominal ultrasound findings in children with hemophagocytic lymphohistiocytosis (1999)
    Springer
    European radiology 9 (1999), S. 474-477 
    Details
    ISSN: 1432-1084
    Schlagwort(e): Key words: Child ; gastrointestinal tract ; Gallbladder ; wall thickening ; Liver ; US ; Histiocytosis ; Hepatitis ; Hemophagocytic lymphohistiocytosis ; Hemophagocytic syndrome
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract. Hemophagocytic lymphohistiocytosis, a variant of histiocytosis, is characterized by an uncontrolled activation of the cellular immune system, including hepatic mononuclear phagocytic cells. Abdominal ultrasound findings in children are evaluated in this disease. We present six pediatric cases, two with familial and four with sporadic hemophagocytic lymphohistiocytosis, examined by abdominal sonography. Three signs were frequently observed: thickening of the gallbladder wall (all cases), increased periportal echogenicity (four cases), and enlarged lymph nodes in the porta hepatis (four cases). Hepatomegaly, splenomegaly, and ascitic fluid may also be found. These imaging findings are not specific and may be seen in viral hepatitis. However, once hepatitis is excluded, they may suggest the diagnosis of hemophagocytic lymphohistiocytosis in a critically ill child. A bone smear must be done to establish the diagnosis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003300050695
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  • 2
    Digitale Medien
    Digitale Medien
    Photoassociative spectroscopy of the long-range state (1999)
    Springer
    The European physical journal 5 (1999), S. 389-403 
    Details
    ISSN: 1434-6079
    Schlagwort(e): PACS. 32.80.Pj Optical cooling of atoms; trapping - 33.20.-t Molecular spectra - 34.20.-b Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: The photoassociative spectroscopy of the Cs2 0 g - long-range molecular state dissociating into the asymptote is performed, using cold cesium atoms in a vapor-cell magneto-optical trap (MOT). Vibrational levels from v =0 to v =132 are identified, and their rotational structure is well resolved up J =8 for levels below v =74. These data are analyzed in terms of the Rydberg-Klein-Rees (RKR) procedure, and correspond to 99.6% of an effective potential curve with a minimum at Å and a cm-1 depth. Both ab initio calculations and simple model estimations predict a double-well structure for this potential curve, which cannot be reproduced presently by the RKR approach but which is confirmed by the presence of giant structures in the spectrum. The 1u( )long-range state is also observed for the first time in Cs2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100530050271
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  • 3
    Digitale Medien
    Digitale Medien
    Formation of cold Cs ground state molecules through photoassociation in the pure long-range state (2000)
    Springer
    The European physical journal 11 (2000), S. 59-71 
    Details
    ISSN: 1434-6079
    Schlagwort(e): PACS. 32.80.Pj Optical cooling of atoms; trapping - 33.20.-t Molecular spectra - 34.20.-b Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: We report on the formation of translationally cold Cs2 ground state molecules through photoassociation in the 1u attractive molecular state below the 6 s 1/2 +6 p 3/2 dissociation limit. The cold molecules are obtained after spontaneous decay of photoassociated molecules in a MOT and in a dark SPOT. We also used polarized atoms, in the f =3, m f =+3Zeeman ground state. Purely asymptotic and adiabatic calculations including hyperfine interaction and rotation are in excellent agreement with observed structures. As expected, the 1u state is actually a pure long-range state, consisting of paired atoms, uniquely linked by the first terms of the multipole expansion of the electrostatic interaction. A temperature of 20 K has been measured for the molecular cloud.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100530070105
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  • 4
    Digitale Medien
    Digitale Medien
    Accurate asymptotic ground state potential curves of Cs $\mathsf{_2}$ from two-colour photoassociation (2004)
    Springer
    The European physical journal 28 (2004), S. 351-360 
    Details
    ISSN: 1434-6079
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. Over 100 high lying level energies of the lowest electronic states $X^1{\rm\Sigma}^ + _g$ and $a^3{\rm\Sigma}^ + _u$ in Cs2 are determined in a $\Lambda$ -like scheme two-colour photoassociation spectroscopy. The results are analyzed with a coupled channel model using an asymptotic approach, based on nodal lines. From this analysis we determine the long range dispersion coefficient C6 to 6846.2 $\pm$ 15.6 a.u. We also obtain the first experimental determination of the amplitude of the asymptotic exchange term.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjd/e2004-00001-y
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  • 5
    Digitale Medien
    Digitale Medien
    Line shape analysis of two-colour photoassociation spectra on the example of the Cs ground state (2002)
    Springer
    The European physical journal 21 (2002), S. 299-309 
    Details
    ISSN: 1434-6079
    Schlagwort(e): PACS. 33.70.Jg Line and band widths, shapes, and shifts – 32.80.Pj Optical cooling of atoms; trapping – 34.50.Rk Laser-modified scattering and reactions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: Two-photon photoassociation spectra in a Λ-type excitation scheme are analysed under the systematically varied experimental conditions of frequency detunings and laser intensities. Line shape fits are presented as well as the investigation of intensity and detuning dependent line shifts. From both we determine the attained spectroscopic precision, that is corrected for a systematic line shift due to the thermal distribution of atoms in the trap. An energy correction for this effect is given. Information about the feasibility of generating translationally cold molecules in a well defined rotational and vibrational level by the photoassociation process is derived from the analysis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjd/e2002-00209-9
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  • 6
    Digitale Medien
    Digitale Medien
    Prospect for BEC in a cesium gas: one-dimensional evaporative cooling in a hybrid magnetic and optical trap (2004)
    Springer
    The European physical journal 28 (2004), S. 259-266 
    Details
    ISSN: 1434-6079
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. Bose-Einstein condensation (BEC) in a atomic cesium gas prepared in a “low field seeker” Zeeman sublevel and confined in a magnetic trap has been thwarted by a high cross-section of inelastic spin-flip collisions. A recent experiment [1] succeeded in reaching BEC for cesium atoms using all optical methods and tuning the scattering length. We will discuss a hybrid magnetic and optical trap for cesium atoms in the true hyperfine ground state, the “high field seeker” Zeeman sublevel, F = m F = 3. Although this trap allows only one-dimensional (1D) evaporative cooling, we show that a route towards BEC with such a trap should be possible. We present simulations of 1D evaporative cooling, which shows that a high phase space density (PSD) of 0.1 could be reached in less than 10 seconds.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjd/e2003-00297-y
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  • 7
    Digitale Medien
    Digitale Medien
    Photoionization and detection of ultracold Cs 2 molecules through diffuse bands (2002)
    Springer
    The European physical journal 18 (2002), S. 365-370 
    Details
    ISSN: 1434-6079
    Schlagwort(e): PACS. 33.80.Eh Autoionization, photoionization, and photodetachment – 33.80.Gj Diffuse spectra; predissociation, photodissociation – 33.80.Ps Optical cooling of molecules; trapping
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: We present the results of absorption measurements in a cesium vapor around 630 K, together with photoionization spectra through a resonance-enhanced two-photon absorption of ultracold cesium dimers created after photoassociation of ultracold cesium atoms. The maximum efficiency of the ultracold molecule ionization is found for wavelengths where absorption at thermal energies is the strongest, in agreement with our theoretical simulations of both processes, involving the so-called Cs2 diffuse bands. This result will be helpful for further optimization of such a direct way of detection of ultracold molecules.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjd/e20020042
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