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Novel method for state selective determination of electron-impact-excitation cross sections from 0° to 180°

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Weyland,  Marvin
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Ren,  Xueguang
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Pflüger,  Thomas
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Dorn,  Alexander
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Citation

Weyland, M., Ren, X., Pflüger, T., Baek, W. Y., Bartschat, K., Zatsarinny, O., et al. (2014). Novel method for state selective determination of electron-impact-excitation cross sections from 0° to 180°. EPJ - Technics and Instrumentation, 1(1): 6. doi:10.1140/epjti/s40485-014-0006-2.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0024-594E-E
Abstract
We use an improved target recoil momentum spectroscopy setup to determine differential cross sections for excited metastable state production in atoms and molecules by electron impact and show its capabilities for an atomic helium target. A crossed beam setup with a supersonic helium jet and a pulsed electron beam at energies close to the excitation threshold of 19.82 eV was used. Measuring the recoil momentum vector of the target instead of the momentum of the scattered electron removes common restrictions to the accessible scattering angles while the microchannel plate detector ensures a high counting efficiency. Using a photoemission electron source we reach an energy resolution of about 200 meV at 1 µA peak current. Results are compared with simulations using theoretical convergent-close-coupling (CCC), R-matrix with pseudo-states (RMPS) and B-spline R-matrix (BSR) calculations and show good agreement.