13,884 research outputs found
QED effects in molecules: test on rotational quantum states of H
Quantum electrodynamic effects have been systematically tested in the
progression of rotational quantum states in the
vibronic ground state of molecular hydrogen. High-precision Doppler-free
spectroscopy of the (0,0) band
was performed with 0.005 cm accuracy on rotationally-hot H (with
rotational quantum states J up to 16). QED and relativistic contributions to
rotational level energies as high as 0.13 cm are extracted, and are in
perfect agreement with recent calculations of QED and high-order relativistic
effects for the H ground state.Comment: 4 pages, 3 figures, to be published in Physical Review Letter
Colliders and Brane Vector Phenomenology
Brane world oscillations manifest themselves as massive vector gauge fields.
Their coupling to the Standard Model is deduced using the method of nonlinear
realizations of the spontaneously broken higher dimensional space-time
symmetries. Brane vectors are stable and weakly interacting, and therefore
escape particle detectors unnoticed. LEP and Tevatron data on the production of
a single photon in conjunction with missing energy are used to delineate
experimentally excluded regions of brane vector parameter space. The additional
region of parameter space accessible to the LHC as well as a future lepton
linear collider is also determined by means of this process.Comment: 12 pages, 13 figure
Two Anderson impurities in a 2D host with Rashba spin-orbit interaction
We have studied the two-dimensional two-impurity Anderson model with
additional Rashba spin-orbit interaction by means of the modified perturbation
theory. The impurity Green's functions we have constructed exactly reproduce
the first four spectral moments. We discuss the height and the width of the
even/odd Kondo peaks as functions of the inter-impurity distance and the Rashba
energy (the strength of the Rashba spin-orbit interaction). For small
impurity separations the Kondo temperature shows a non-monotonic dependence on
being different in the even and the odd channel. We predict that the
Kondo temperature has only almost linear dependence on and not an
exponential increase with Comment: To be published in Phys. Rev.
THE EFFECT OF APPLYING WITH IMMUNOCYTOPHYTE ON THE CONTENT AND CHEMICAL COMPOSITION OF THE ESSENTIAL OIL FROM COMMON BASIL OF ‘TRAKIA’ CULTIVAR
The aim of the study was to establish the effect of the leaf treatments with Immunocytophyte on the content, yield and chemical composition of the essential oil distilled from dry leaf and stems biomass and flower spikes of common basil, ‘Trakia’ cultivar. The experiment was carried out in the period 2007-2009 on the Training-and-Experimental fields of the Agricultural University – Plovdiv, set by the block plot design in four replications, the plot size being 20 m2. The following variants were studied: 1) Control; 2) 0.5 tablet per 50 m2, 3) 1 tablet per 50 m2, 4) 1.5 tablet per 50 m2, applied three times during the vegetation period before flowering of the second-order branches after basic fertilization with 16 kg/da of nitrogen (applied three times) and irrigation to 80-100% of water holding capacity. The results showed that the application of Immunocytophyte had a negative effect on the essential oil content. Nevertheless, higher essential oil yields were obtained in the treated variants thanks to the higher yield of dry matter. The major components of the essential oil distilled from dry leaf and stem biomass and flower spikes are linalool, limonene, methyl chavicol and methyl cinnamate
Joint probability calculation of the lateral velocity distribution in strong field ionization process
We describe an approach to the description of the time-development of the
process of strong field ionization of atoms based on the calculation of the
joint probability of occurrence of two events, event B being finding atom in
the ionized state after the end of the laser pulse, event A being finding a
particular value of a given physical observable at a moment of time inside the
laser pulse duration. As an example of such an physical observable we consider
lateral velocity component of the electron's velocity. Our approach allows us
to study time-evolution of the lateral velocity distribution for the ionized
electron during the interval of the laser pulse duration. We present results of
such a study for the cases of target atomic systems with short range Yukawa and
Coulomb interactions
- …