ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

11

Digitale Medien

The anti-self-dual Coulomb field in Minkowski space-time (1985)

Porter, John R.

College Park, Md. : American Institute of Physics (AIP)

Journal of Mathematical Physics 26 (1985), S. 428-430

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7658

Quelle: AIP Digital Archive

Thema: Mathematik , Physik

Notizen: The twistor encoding of the anti-self-dual Coulomb field is given in terms of the space-time connections pulled back to I+ and to I−. This description differs considerably from that of the twistor encoding of transverse or radiation fields, which have been the only fields studied in this fashion to date. A twisted structure results on I+ and a topologically incomputable one on I− and these are identified modulo the null lines intersecting the source world-line.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.526626

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

12

Digitale Medien

A twistor encoding of Lienard–Wiechert fields in Minkowski space-time (1985)

Porter, John R.

College Park, Md. : American Institute of Physics (AIP)

Journal of Mathematical Physics 26 (1985), S. 431-433

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7658

Quelle: AIP Digital Archive

Thema: Mathematik , Physik

Notizen: The twistor encoding of the anti-self-dual Lienard–Wiechert field on Minkowski space-time yields a considerably richer structure than that of the Coulomb field encoding due to the presence of a nonzero radiation field. The combination of advanced and retarded transverse fields together with the longitudinal field and the individual aspects of these fields provides this structure. Higher-order longitudinal moments can be incorporated so that general longitudinal fields can be given a twistor description.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.526627

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

13

Digitale Medien

Ab initio evaluation of the Born correction, Born couplings, and higher derivative matrix elements with Gaussian-lobe orbitals (1988)

Zhang, Yongfeng ; Sukumar, Nagamani ; Whitten, Jerry L. ; [weitere]

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 88 (1988), S. 7662-7670

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7690

Quelle: AIP Digital Archive

Thema: Physik , Chemie und Pharmazie

Notizen: Formulation of the expectations of eight operators required for the evaluation of the Born corrections, the Born couplings, and higher derivatives of the Born–Oppenheimer wave functions are derived for the case of a Gaussian-lobe orbital (GLO) basis. The relative simplicity of these analytical formulas is a special advantage of GLO and reduces the computer time in these calculations. Some operators treated here require a modification of the Slater rules. As examples of applications of these techniques, ab initio calculations of the orbital stresses and the Born corrections for the ground state X 1Σ+g and excited states 1Σ+g(II), C, C' 3Πu, and 3Πu(II) of N2 are reported. The obtained results show that the Born correction near the avoided crossing region strongly depends upon the nuclear separation; in this region configuration interaction makes an important contribution.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.454280

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

14

Digitale Medien

Energy partitioning in He2+/K collisions (1985)

Burkhardt, C. E. ; Earsom, D. L. ; Daulton, T. L. ; [weitere]

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 82 (1985), S. 3646-3649

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7690

Quelle: AIP Digital Archive

Thema: Physik , Chemie und Pharmazie

Notizen: Final state distributions and state-specific reaction cross sections for 1.5–6 keV He2+/K collisions have been determined from data acquired using both neutralized ion beam spectroscopy and direct observation of luminescence from decay of excited collision products. While several minor reaction channels can be identified, it is found that near-resonant processes yielding He2(a 3Σu+) and He2(A 1Σu+) are predominant. These major channels, both of which have cross sections in excess of 100 A(ring)2, lead to substantial production of energetic metastable molecules and VUV continuum radiation extending from about 750 to 850 A(ring).

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.448899

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

15

Digitale Medien

Isotope effects on the populations of metastable H3 and D3 molecules in neutralized ion beams (1985)

Jeon, Seung-Joon ; Raksit, Asit B. ; Gellene, Gregory I. ; [weitere]

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 82 (1985), S. 4916-4919

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7690

Quelle: AIP Digital Archive

Thema: Physik , Chemie und Pharmazie

Notizen: The relative abundances of metastable H@B|3 and D*3 molecules in collimated beams of neutralized ions are analyzed by the technique of collisional reionization (charge stripping). The fraction of metastable/dissociative species formed in the electron transfer process H+3(D+3)+K(g) → H@B|3(D*3)+K+ diminishes if the precursor ions have excess internal energy. The abundance ratio of H@B|3/D*3 for equivalent 6 keV beam fluxes increases sharply when the time span between neutralization and reionization is increased. The measurements show that a state of D@B|3 with low rotational quantum numbers (N〉0) is decaying on the time scale of the beam transit with a lifetime of about 0.2 μs. Results are interpreted in reference to the predissociation behavior of the 2p 2A2 electronic state of the radical. The disproportionate ratio of IH@B|3/ID*3 (very-much-greater-than) 1 is a consequence of the relative abundances of precursor levels in H+3 and D+3 that can transform into metastables by electron transfer.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.448664

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

16

Unbekannt

Invited Article: First flight in space of a wide-field-of-view soft x-ray imager using lobster-eye optics: Instrument description and initial flight results (2015)

Michael R. Collier, F. Scott Porter, David G. Sibeck, Jenny A. Carter, Meng P. Chiao, Dennis J. Chornay, Thomas E. Cravens, Massimiliano Galeazzi, John W. Keller, Dimitra Koutroumpa, Joseph Kujawski, Kip Kuntz, Andy M. Read, Ina P. Robertson, Steve Sembay, Steven L. Snowden, Nicholas Thomas, Youaraj Uprety and Brian M. Walsh

American Institute of Physics (AIP)

In: Review of Scientific Instruments

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2015-07-29

Beschreibung: We describe the development, launch into space, and initial results from a prototype wide field-of-view soft X-ray imager that employs lobster-eye optics and targets heliophysics, planetary, and astrophysics science. The sheath transport observer for the redistribution of mass is the first instrument using this type of optics launched into space and provides proof-of-concept for future flight instruments capable of imaging structures such as the terrestrial cusp, the entire dayside magnetosheath from outside the magnetosphere, comets, the Moon, and the solar wind interaction with planetary bodies like Venus and Mars [Kuntz et al. , Astrophys. J. (in press)].

Print ISSN: 0034-6748

Digitale ISSN: 1089-7623

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik

Publiziert von American Institute of Physics (AIP)

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

17

Unbekannt

Characterization of an atomic hydrogen source for charge exchange experiments (2016)

M. A. Leutenegger, P. Beiersdorfer, G. L. Betancourt-Martinez, G. V. Brown, N. Hell, R. L. Kelley, C. A. Kilbourne, E. W. Magee and F. S. Porter

American Institute of Physics (AIP)

In: Review of Scientific Instruments

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2016-08-04

Beschreibung: We characterized the dissociation fraction of a thermal dissociation atomic hydrogen source by injecting the mixed atomic and molecular output of the source into an electron beam ion trap containing highly charged ions and recording the x-ray spectrum generated by charge exchange using a high-resolution x-ray calorimeter spectrometer. We exploit the fact that the charge exchange state-selective capture cross sections are very different for atomic and molecular hydrogen incident on the same ions, enabling a clear spectroscopic diagnostic of the neutral species.

Print ISSN: 0034-6748

Digitale ISSN: 1089-7623

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik

Publiziert von American Institute of Physics (AIP)

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

18

Unbekannt

CARM1 Preferentially Methylates H3R17 over H3R26 through a Random Kinetic Mechanism (2016)

Suzanne L. Jacques, Katrina P. Aquino, Jodi Gureasko, P. Ann Boriack-Sjodin, Margaret Porter Scott, Robert A. Copeland and Thomas V. Riera

American Chemical Society (ACS)

In: Biochemistry

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2016-02-07

Beschreibung: Biochemistry DOI: 10.1021/acs.biochem.5b01071

Print ISSN: 0006-2960

Digitale ISSN: 1520-4995

Thema: Biologie , Chemie und Pharmazie

Publiziert von American Chemical Society (ACS)

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

19

Unbekannt

2′-Alkynylnucleotides: A Sequence- and Spin Label-Flexible Strategy for EPR Spectroscopy in DNA (2016)

Marius M. Haugland, Afaf H. El-Sagheer, Rachel J. Porter, Javier Peña, Tom Brown, Edward A. Anderson and Janet E. Lovett

American Chemical Society (ACS)

In: Journal of the American Chemical Society

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2016-07-20

Beschreibung: Journal of the American Chemical Society DOI: 10.1021/jacs.6b05421

Print ISSN: 0002-7863

Digitale ISSN: 1520-5126

Thema: Chemie und Pharmazie

Publiziert von American Chemical Society (ACS)

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

20

Unbekannt

Demonstration of thermonuclear conditions in magnetized liner inertial fusion experimentsa) (2015)

M. R. Gomez, S. A. Slutz, A. B. Sefkow, K. D. Hahn, S. B. Hansen, P. F. Knapp, P. F. Schmit, C. L. Ruiz, D. B. Sinars, E. C. Harding, C. A. Jennings, T. J. Awe, M. Geissel, D. C. Rovang, I. C. Smith, G. A. Chandler, G. W. Cooper, M. E. Cuneo, A. J. Harvey-Thompson, M. C. Herrmann, M. H. Hess, D. C. Lamppa, M. R. Martin, R. D. McBride, K. J. Peterson, J. L. Porter, G. A. Rochau, M. E. Savage, D. G. Schroen, W. A. Stygar and R. A. Vesey

American Institute of Physics (AIP)

In: Physics of Plasmas

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2015-04-30

Beschreibung: The magnetized liner inertial fusion concept [S. A. Slutz et al ., Phys. Plasmas 17 , 056303 (2010)] utilizes a magnetic field and laser heating to relax the pressure requirements of inertial confinement fusion. The first experiments to test the concept [M. R. Gomez et al ., Phys. Rev. Lett. 113 , 155003 (2014)] were conducted utilizing the 19 MA, 100 ns Z machine, the 2.5 kJ, 1 TW Z Beamlet laser, and the 10 T Applied B-field on Z system. Despite an estimated implosion velocity of only 70 km/s in these experiments, electron and ion temperatures at stagnation were as high as 3 keV, and thermonuclear deuterium-deuterium neutron yields up to 2 × 10 12 have been produced. X-ray emission from the fuel at stagnation had widths ranging from 50 to 110 μ m over a roughly 80% of the axial extent of the target (6–8 mm) and lasted approximately 2 ns. X-ray yields from these experiments are consistent with a stagnation density of the hot fuel equal to 0.2–0.4 g/cm 3 . In these experiments, up to 5 × 10 10 secondary deuterium-tritium neutrons were produced. Given that the areal density of the plasma was approximately 1–2 mg/cm 2 , this indicates the stagnation plasma was significantly magnetized, which is consistent with the anisotropy observed in the deuterium-tritium neutron spectra. Control experiments where the laser and/or magnetic field were not utilized failed to produce stagnation temperatures greater than 1 keV and primary deuterium-deuterium yields greater than 10 10 . An additional control experiment where the fuel contained a sufficient dopant fraction to substantially increase radiative losses also failed to produce a relevant stagnation temperature. The results of these experiments are consistent with a thermonuclear neutron source.

Print ISSN: 1070-664X

Digitale ISSN: 1089-7674

Thema: Physik

Publiziert von American Institute of Physics (AIP)

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext