Revised and extended analysis of five times ionized xenon, Xe Vi

A capillary discharge tube was used to record the Xe spectrum in the 400-5500 Å region. A set of 243 lines of the Xe VI spectrum was observed, and 146 of them were classified for the first time. For all known lines, we calculated the weighted oscillator strengths (gf) and weighted transition probabilities (gA) using the configuration interaction in a relativistic Hartree-Fock approach. The energy matrix was calculated using energy parameters adjusted to fit the experimental energy levels. Core polarization effects were taken into account in our calculations. Experimental energy values and calculated lifetimes are also presented for a set of 88 levels. From these levels, 32 were classified for the first time and 33 had their values revised. Our analysis of the 5s5p5d and 5s5p6s configurations was extended in order to clarify discrepancies among previous works216

Revised and Extended Analysis of Five Times Ionized Argon (Ar VI)

The spectrum of five times ionized argon, (Ar VI), has been observed in the 280-2100 Å wavelength range. Eighty-seven lines have been identified as transitions between levels of the 3s23p, 3s3p2, 3s23d, 3p3, 3s3p3d, 3s24s, 3s24d and 3s3p4s configurations. For 33 of the lines the classification is new. Forty-one energy level values belonging to these configurations were analyzed and we propose 9 new energy level values for levels corresponding to odd parity configurations. The configurations are interpreted by fitting the theoretical energy expressions to the observed energy levels using least- squares techniques. The parameter values are compared with results from Hartree-Fock calculations.Facultad de Ciencias Exacta

Revised and Extended Analysis of Five Times Ionized Argon (Ar VI)

The spectrum of five times ionized argon, (Ar VI), has been observed in the 280-2100 Å wavelength range. Eighty-seven lines have been identified as transitions between levels of the 3s23p, 3s3p2, 3s23d, 3p3, 3s3p3d, 3s24s, 3s24d and 3s3p4s configurations. For 33 of the lines the classification is new. Forty-one energy level values belonging to these configurations were analyzed and we propose 9 new energy level values for levels corresponding to odd parity configurations. The configurations are interpreted by fitting the theoretical energy expressions to the observed energy levels using least- squares techniques. The parameter values are compared with results from Hartree-Fock calculations.Facultad de Ciencias Exacta

Mediciones de dióxido de azufre en aire mediante métodos activos y pasivos

El trabajo tiene como objetivos el estudio, desarrollo y aplicación de técnicas para la medición de contaminantes atmosféricos derivados del azufre en zonas de La Plata y alrededores del Polo Petroquímico mediante métodos activos y pasivos. En la obtención de datos sobre concentranciones de dióxido de azufre se utiliza un método activo, el analizador de SO₂ por fluorescencia en el UV. Los datos logrados se comparan con los que se obtienen utilizando técnicas pasivas de medición química y biológicas, tales como la tasa de sulfatación, que se constituye en uno de los indicadores válidos para estimar el estado general del aire en una zona determinada y la comparación de la flora liquénica de las areas en estudio con la de otras no contaminadas. Todas las determinaciones se correlacionan con los factores climáticos y además, para que resulten comparativas en sí mismas, se efectúan en diversas zonas consideradas de "mayor riesgo", que se contrastan con otras. consideradas de "bajo riesgo".Asociación Argentina de Energías Renovables y Medio Ambiente (ASADES

Extended analysis of the six-times ionized xenon, Xe VII

The spectrum of six-times ionized xenon, Xe VII, has been studied in the 270-6,500 Å using a pulsed discharge. 110 new classified lines are reported. Ten levels belonging to the odd parity configurations and four belonging to the even configurations have been determined. To obtain the energy parameters Hartree-Fock relativistic calculations were used. Least-squares parametric calculation has been carried out to study the fit between experimental and theoretical values

New Transition and Energy Levels of Three-Times Ionized Krypton (Kr IV)

A capillary pulsed-discharge and a theta-pinch were used to record Kr spectra in the region of 330–4800 Å. A set of 168 transitions of these spectra were classified for the first time. We extended the analysis to twenty-five new energy levels belonging to 3s23p24d, 3s23p25d even configurations. We calculated weighted transition probabilities (gA) for all of the experimentally observed lines and lifetimes for new energy levels using a relativistic Hartree–Fock method, including core-polarization effects