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  • PACS. 32.80.Pj Optical cooling of atoms; trapping – 34.50.Rk Laser-modified scattering and reactions  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 17 (2001), S. 319-328 
    ISSN: 1434-6079
    Keywords: PACS. 32.80.Pj Optical cooling of atoms; trapping – 34.50.Rk Laser-modified scattering and reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We present a new determination of the potential curves and interactions of the coupled electronic states A 1 Σ + u and b 3 Π u of the potassium dimer, based on new laser spectroscopy measurements within a molecular beam, combined with data available in the literature. We used a new global deperturbation approach, involving the Fourier Grid Hamiltonian method for energy level calculation. A standard deviation of 1.2 is obtained corresponding to a variance of 7.5×10 -3 cm-1, representing a significant improvement compared to the standard deviation of 4 yielded by the traditional local deperturbation approach.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-6079
    Keywords: PACS. 32.80.Pj Optical cooling of atoms; trapping – 34.50.Rk Laser-modified scattering and reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We report the detailed analysis of translationally cold rubidium molecule formation through photoassociation. Cold molecules are formed after spontaneous decay of photoexcited molecules from a laser cooled atomic sample, and are detected by selective mass spectroscopy after two-photon ionization into Rb 2 + ions. A spectroscopic study of the 0 g - (5 S + 5 P 3/2 ) pure long-range state of 87Rb2 is performed by detecting the ion yield as a function of the photoassociation laser frequency; the spectral data are theoretically analyzed within the semiclassical RKR approach. Molecular ionization is resonantly enhanced through either the 2 3 Π g or the 2 3 Σ + g intermediate molecular states. Some vibrational levels of the latter electronic state are observed and assigned here for the first time. Finally, cold molecules formation rates are calculated and compared to the experimentally measured ones, and the vibrational distribution of the formed molecules in the a 3 Σ + u ground triplet state is discussed.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1434-6079
    Keywords: PACS. 32.80.Pj Optical cooling of atoms; trapping – 34.50.Rk Laser-modified scattering and reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We present experimental results on the two-body loss rates in a magneto-optical trap of metastable helium atoms. Absolute rates are measured in a systematic way for several laser detunings ranging from -5 to -30 MHz and at different intensities, by monitoring the decay of the trap fluorescence. The dependence of the two-body loss rate coefficient β on the excited state ( 23 P 2) and metastable state ( 23 S 1) populations is also investigated. From these results we infer a rather uniform rate constant K sp = (1±0.4)×10-7 cm3/s.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 265 (1947), S. 325-328 
    ISSN: 1618-2650
    Keywords: Best. Von Benzylhydrazin und phenelzin ; Spektralphotometrie ; Reaktion mit Glutacondialdehyd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Glutacondialdehyd, hergestellt aus Pyridylpyridiniumdichlorid und Natronlauge, reagiert, wenn er im Überschuß vorliegt, in saurer Lösung mit den Monoaminoxydasehemmern Benzylhydrazin und Phenelzin unter Bildung roter Kondensationsprodukte. Diese Farbreaktion bildet die Grundlage der photometrischen Bestimmungsverfahren, bei denen 0,6–100 nMol/ml der Hydrazinderivate bestimmt werden können. Bei 2 nMol/ml betragen die Variationskoeffizienten 3,2 Rel-% für Benzylhydrazin und 5,2 Rel-% für Phenelzin.
    Notes: Abstract Benzylhydraine and phenelzine both of which are inhibitors of monoaminoxidase reactions form red condensation products in their reaction with glutacondialdehyde. The latter compound which was prepared from pyridylpyridinium dichloride and sodium hydroxide has to be in excess concentration. This colour reaction is used in a photometric method to determine 0.6 to 100 nmole/ml of the hydrazine derivatives. The variation coefficients at 2 nmole/ml are 3.2 and 5.2% rel. for benzylhydrazine and phenelzine, respectively.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 265 (1947), S. 334-336 
    ISSN: 1618-2650
    Keywords: Best. von Ascorbinsäure und Dehydroascorbinsäure in Pharmazeut. Produkten ; Spektralphotometrie ; Dimethylphenylendiamin als Reagens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The condensation of dehydroascorbic acid with o-phenylene diamine or its 4,5-dimethyl derivative yields quinoxaline derivatives which can be measured by photometry. Ascorbic acid can be determined after preliminary oxidation with mercury(II) chloride in the same way. This highly specific method has been employed for determinations in pharmaceutical formulations (coefficient of variation ± 1–1.5%).
    Notes: Zusammenfassung Die Kondensation von Dehydroascorbinsäure mit o-Phenylendiamin oder 4,5-Dimethyl-o-phenylendiamin führt zur Bildung von spektrophotometrisch auswertbaren Chinoxalinderivaten. Ascorbinsäure kann nach vorangehender Oxidation mit Quecksilberchlorid auf die gleiche Weise bestimmt werden. Die Methode wurde zu Bestimmungen in pharmazeutischen Präparaten verwendet (Variationskoeffizient ± 1–1,5%).
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 265 (1947), S. 348-348 
    ISSN: 1618-2650
    Keywords: Best. von Eisen(III) ; Spektralphotometrie ; Extraktion mit Thiothenoyltrifluoraceton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 265 (1947), S. 349-349 
    ISSN: 1618-2650
    Keywords: Best. von Eisen(III) in Stahl ; Spektralphotometrie ; Extraktion mit Acetylaceton und Pyridin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 265 (1947), S. 351-351 
    ISSN: 1618-2650
    Keywords: Best. von Kobalt neben Nickel ; Spektralphotometrie ; Extraktion mit Äthylacetat als Xanthate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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