792 research outputs found
Control of recollision wave packets for molecular orbital tomography using short laser pulses
The tomographic imaging of arbitrary molecular orbitals via high-order
harmonic generation requires that electrons recollide from one direction only.
Within a semi-classical model, we show that extremely short phase-stabilized
laser pulses offer control over the momentum distribution of the returning
electrons. By adjusting the carrier-envelope phase, recollisions can be forced
to occur from mainly one side, while retaining a broad energy spectrum. The
signatures of the semi-classical distributions are observed in harmonic spectra
obtained by numerical solution of the time-dependent Schr\"{o}dinger equation.Comment: 8 pages, 4 figures; v2: Added some extra clarifications; v3: minor
grammatical change
1. Wochenbericht Maria S. Merian Expedition MSM70: BATHYCHEM - Bathymetrist Seamounts
Atlantik 9°10 N/ 21°16 W, 31. Dezember 201
Prevention, Diagnosis and Treatment of Acute Kidney Transplant Rejection
Kidney transplant rejection is complex clinical problem with long-lasting consequences for the patient. The focus of this thesis is optimization of the maintenance immunosuppressive therapy, diagnosis and treatment of kidney transplant rejection. The conclusions of this thesis are:
__i)__ belatacept remains a promising immunosuppressive drug for subgroups of kidney transplant recipients, for instance in patients with post-transplantation diabetes mellitus, but a more tailored st
Mabahiss Mons, 25.5°N Red Sea Rift: Tectonics and Volcanism of a Large Submarine Dome Volcano
Determination of quality characteristics of software products : concepts and case study experiences
Determination of quality characteristics of software products : concepts and case study experiences
Hydrothermal Activity at Slow-Spreading Mid-Ocean Ridges: Evidence from Chlorine in Basalt
Hydrothermal activity can be traced by the chlorine (Cl) concentrations of erupted mid-ocean ridge basalts, if their magmas assimilated hydrothermally altered, Cl-rich crust. In contrast to fast-spreading ridges, this process is not observed so far at slow-spreading ridges, due to their intrinsically lower basaltic Cl contents (<200 ppm). This study involves the development of a new, high precise (<2 ppm SD) technique to measure Cl by electron microprobe, which is applied to basaltic glasses and mineral melt-inclusions from the southern Mid-Atlantic Ridge, the Red Sea Rift and the Gakkel Ridge (all <3.5 cm/yr). Addition of hydrothermal Cl is determined by comparing Cl with major and trace element concentrations. Chemical thermobarometry is used to obtain depth information on hydrothermal circulation. Cl data is compared to geological settings (e.g. hydrothermal sites, volcanoes, faults) to examine their relationships and to assess basaltic Cl as prospection tool for hydrothermal vents
Linear dichroism of CdSe nanodots: Large anisotropy of the band-gap absorption induced by ground-state dipole moments
We measured the electric field induced linear dichroism for a wide range of sizes of CdSe nanocrystals. Large ground-state dipole moments were observed, especially for the smallest crystals. In these, we found a very large anisotropy of the absorption and most of the dipole strength is along the direction of the ground-state dipole moment. For the anisotropy, we propose a mechanism for intensity borrowing from intraband transitions, induced by the field of the ground-state dipole moment. © 2008 The American Physical Society
The silver linings of lottery play: motivation and subjective well-being of British lottery participants
Although certain researchers have attributed widespread lottery play to irrational beliefs that people hold regarding the chances of winning the lottery, another explanation for the popularity of lottery gambling is that lottery players may experience positive emotions before the draw. Therefore, in this study, we examine the relationship between lottery participation and happiness. Using data from the British Gambling Prevalence Survey 2010 and utilizing propensity score matching methods, we find a small positive effect of lottery participation on happiness for individuals who engage in lottery play for recreational purposes
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