Determination of the solid angle and response function of a hemispherical spectrograph with injection lens for Auger electrons emitted from long lived projectile states.
We present SIMION 8.1 Monte Carlo type simulations of the response function and detection solid angle for long lived Auger states (lifetime τ ∼ 10(-9) - 10(-5) s) recorded by a hemispherical spectrograph with injection lens and position sensitive detector used for high resolution Auger spectroscopy of ion beams. Also included in these simulations for the first time are kinematic effects particular to Auger emission from fast moving projectile ions such as line broadening and solid angle limitations allowing for a more accurate and realistic line shape modeling. Our results are found to be in excellent agreement with measured electron line shapes of both long lived 1s2s2p(4)P and prompt Auger projectile states formed by electron capture in collisions of 25.3 MeV F(7+) with H2 and 12.0 MeV C(4+) with Ne recorded at 0° to the beam direction. These results are important for the accurate evaluation of the 1s2s2p (4)P/(2)P ratio of K-Auger cross sections whose observed non-statistical production by electron capture into He-like ions, recently a field of interesting interpretations, awaits further resolution.
Position, Energy, and Transit Time Distributions in a Hemispherical Deflector Analyzer with Position Sensitive Detector
Practical analytic equations, for the ideal field, and numerical results from SIMION simulations, for the fringing field, are presented for the exit radius and transit time of electrons in a hemispherical deflector analyzer (HDA) over a wide range of analyzer parameters. Results are presented for a typically dimensioned HDA with mean radius  mm and interradial separation  mm able to accommodate a 40 mm diameter position sensitive detector (PSD). Results for three different entry positions are compared: (the conventional central entry) and two displaced (paracentric) entries:  mm and  mm. Exit spreads , and base energy resolution are computed for HDA pass energies , 100, 500, and 1000 eV, entry aperture sizes  mm, entry angular spreads °, and an electron beam with relative energy spread . Overall, under realistic conditions, both paracentric entries demonstrate near ideal field behavior and clear superiority over the conventional entry at . The  mm entry has better absolute energy and time spread resolutions, while the  mm has better relative energy resolutions, both offering attractive alternatives for time-of-flight and coincidence applications where both energy and timing resolutions are important.
Energy and autoionization width of the 1s3s3p 4P degrees and 1s3p3p 4P states in lithiumlike ions.
Calcul par la methode de rotation complexe du point de selle pour ces resonances de Feshbach (2≤z≤6) avec formation d'ions dans les etats 1s2s 3 S et 1s2p 3 P 0 apres autoionisation, dont les vitesses de declin radioactif sont petites en comparaison de celles d'autoionisation. Etude detaillee de la composante du canal forme de la resonance 1s3p3p 4 P