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Investigation of the interaction of subpicosecond KrF laser pulses with a preformed carbon plasma (1995)

Theobald, W. ; Wülker, C. ; Szatmári, S. ; [et al.]

Springer

Applied physics 61 (1995), S. 593-600

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ISSN: 1432-0649

Keywords: 52.40.Nk ; 52.50.Jm ; 52.25.Jm

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The interaction of a subpicosecond KrF laser pulse with a preformed carbon plasma of various scale lengths is investigated. Two different interaction geometries are chosen. In the first one the propagation vector of the short pulse has a component along the density gradient of the preformed plasma (angle of incidence is 45°). In the second geometry the propagation direction of the short pulse is perpendicular to the density gradient of the preplasma (angle of incidence is 90°). The emitted soft X-ray spectrum in the wavelength interval from 10 to 700 Å is observed while changing several parameters of the experiment. It is found that the emission in the “short” wavelength part under 200 Å results from the radiation of ions created by collisional heating near the critical density region. The “long” wavelength part above 200 Å, enhanced up to a maximal factor of 20, is mainly produced by radiating particles field—ionized up to the He-like carbon state in the high-intensity laser field. The “short” wavelength part is missing in the case of 90° angle of incidence because there is no interaction with the critical layer that results in an insufficient collisional heating.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01091218

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13C, 31P and 1H NMR studies of chiral bis[(4R,6R)-4,6-dimethyl-1, 3, 2-dioxaphosphorinan-2-yloxy]alkane derivatives. Coupling between phosphorus atoms six bonds apart (1987)

Szalontai, G. ; Bakos, J. ; Tóth, I. ; [et al.]

Chichester : Wiley-Blackwell

Organic Magnetic Resonance 25 (1987), S. 761-765

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ISSN: 0749-1581

Keywords: 13C, 1H, 31P NMP spectra ; Chiral P-substituted 1,3,2-dioxaphosphorinanes ; Spin simulation of AXX systems ; Substantial temperature-dependent ; six-bond 6J (PP) coupling ; Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: 13C, 1H and 31P NMR investigations were carried out to confirm the stereochemistry of novel bis[(4R,6R)-4,6-dimethyl-1,3,2-dioxaphosphorinan-2-yloxy]alkanes. The 13C NMR spectra exhibited second-order features at room temperature. Substantial coupling was found between P atoms six bonds apart. The possibility of a through-space contribution was tested. Spatially close P atoms and the strongly electronegative P substituents (oxygen atoms) are thought to be responsible for the enhanced P… P coupling.

Additional Material: 1 Ill.