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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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1H, 13C and 31P NMR studies of the stereochemistry of chiral (4R, 6R)-2-substituted-1,3,2-dioxaphosphorinanes (1986)

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

Chichester : Wiley-Blackwell

Organic Magnetic Resonance 24 (1986), S. 890-896

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ISSN: 0749-1581

Keywords: 1H ; 13C and 31P NMR spectra ; chiral P-substituted 1,3,2-dioxaphosphorinanes ; conformational analysis ; spin simulation ; double resonance ; 2D-J experiments ; Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: 13C, 1H and 31P NMR investigations have been carried out to determine the ring stereochemistry and phosphorus configuration for four chiral (4R, 6R)-2-substituted-1,3,2-dioxaphosphorinane derivatives 1-4 (2-substituent = Cl, Ph, OMe and O-t-Bu, respectively). 1H NMR spectra, double resonance, 2D-J experiments and spin simulation proved the chair character of the ring. Depending on the position of R, two diastereomers may exist, but in most cases only one predominating form was detected. Dynamic processes were observed for 1 and 2. Saturation transfer experiments proved the existence of ring and/or phosphorus inversions.

Additional Material: 3 Ill.