Coulomb-corrected quantum interference in above-threshold ionization: Working towards multi-trajectory electron holography

Using the recently developed Coulomb Quantum Orbit Strong-Field Approximation (CQSFA), we perform a systematic analysis of several features encountered in above-threshold ionization (ATI) photoelectron angle-resolved distributions (PADs), such as side lobes, and intra- and intercycle interference patterns. The latter include not only the well-known intra-cycle rings and the near-threshold fan-shaped structure, but also previously overlooked patterns. We provide a direct account of how the Coulomb potential distorts different types of interfering trajectories and changes the corresponding phase differences, and show that these patterns may be viewed as generalized holographic structures formed by up to three types of trajectories. We also derive analytical interference conditions and estimates valid in the presence or absence of the residual potential, and assess the range of validity of Coulomb-corrected interference conditions provided in the literature.Comment: 17 pages, 11 figures. Some figures have been compressed in order to comply with the arXiv requirement

Existence criteria for stabilization from the scaling behaviour of ionization probabilities

We provide a systematic derivation of the scaling behaviour of various quantities and establish in particular the scale invariance of the ionization probability. We discuss the gauge invariance of the scaling properties and the manner in which they can be exploited as consistency check in explicit analytical expressions, in perturbation theory, in the Kramers-Henneberger and Floquet approximation, in upper and lower bound estimates and fully numerical solutions of the time dependent Schroedinger equation. The scaling invariance leads to a differential equation which has to be satisfied by the ionization probability and which yields an alternative criterium for the existence of atomic bound state stabilization.Comment: 12 pages of Latex, one figur

Comment on the Adiabatic Condition

The experimental observation of effects due to Berry's phase in quantum systems is certainly one of the most impressive demonstrations of the correctness of the superposition principle in quantum mechanics. Since Berry's original paper in 1984, the spin 1/2 coupled with rotating external magnetic field has been one of the most studied models where those phases appear. We also consider a special case of this soluble model. A detailed analysis of the coupled differential equations and comparison with exact results teach us why the usual procedure (of neglecting nondiagonal terms) is mathematically sound.Comment: 9 page

Distribuição espacial das necessidades hídricas das culturas do feijão, milho e soja na bacia do rio Tibaji, PR.

bitstream/item/89786/1/BOP-16.pd

Características agronômicas, botânicas, e fenológicas de genótipos de arroz-vermelho.

O objetivo deste trabalho foi apresentar algumas informações sobre os genótipos de arroz-vermelho coletados em regiões brasileiras

Caracterização morfoagronômica e fenológica de acessos da coleção de arroz da Embrapa Arroz e Feijão.

O objetivo deste trabalho foi estudar as características morfoagronômicas e fenológicas de acessos de arroz-cateto coletados em regiões de cultivo no país

Propagation of Light in Photonic Crystal Fibre Devices

We describe a semi-analytical approach for three-dimensional analysis of photonic crystal fibre devices. The approach relies on modal transmission-line theory. We offer two examples illustrating the utilization of this approach in photonic crystal fibres: the verification of the coupling action in a photonic crystal fibre coupler and the modal reflectivity in a photonic crystal fibre distributed Bragg reflector.Comment: 15 pages including 7 figures. Accepted for J. Opt. A: Pure Appl. Op

Potencial de rochas silicáticas no fornecimento de nutrientes para milheto. 1. Macronutrientes.

Realizaram-se experimentos com o objetivo de avaliar o efeito residual de diferentes doses e fontes de potássio no acúmulo de macronutrientes na parte aérea do milheto. Foram implantados dois ensaios em casa de vegetação na Embrapa Semi-Árido, em Petrolina-PE: um em Argissolo Acinzentado, de rextura arenosa, e outro em Vertissolo, de textura argilosa. As variáveis em estudo foram três fontes de K (Biotita-Xisto, Brecha Piroclástica e Cloreto de Potássio comercial), três doses de K2O (50, 100 e 150 mg dm-3) e quatro tratamentos adicionais (testemunha absoluta, testemunha mais demais nutrientes, 50 mg dm-3 de K2O nas formas de Biotita-Xisto e de Brecha Piroclástica). Cada ensaio constituiu-se de um fatorial (3 x 3) + 4, disposto no delineamento inteiramente casualizado, com quatro repetições. As unidades experimentais consistiram de vasos plásticos com 3 dm3 de solo. Todas as unidades experimentais, com exceção dos tratamentos testemunha absoluta e adicionais com as duas rochas teste, receberam uma adubação básica e uniforme com macro e micronutrientes, definida em função dos resultados de análise de solo. No Argissolo Acinzentado, ambas as rochas silicáticas proporcionaram baixas quantidades de K e dos demais nutrientes às plantas de milheto. A biotita-xista forneceu maior conteúdo de S às plantas. No Vertissolo, as rochas silicáticas não foram eficientes no fornecimento de nutrientes ao milheto