18128
20150420163723.0
oai:doc.rero.ch:20100429103748-WX
article
rero_explore
postprint
unifr
dissertation
cdu1
preprint
cdu16
journal
book
thesis
report
thesis_urn
cdu34
cdu53
eng
53
Hoffmann, T. H.
Fachbereich Physik, Technische Universität KL, Kaiserslautern, Germany - Department of Chemistry, University of Fribourg, Switzerland
eng
New light on the Kr⁻(4p⁵5s²) Feshbach resonances: high-resolution electron scattering experiments and <i>B</i>-spline <i>R</i>-matrix calculations
2010-04-05
eng
In a joint experimental and theoretical effort, we carried out a detailed study of electron scattering from Kr atoms in the energy range of the low-lying Kr⁻($4p^5 5s^2$) Feshbach resonances. Absolute angle-differential cross sections for elastic electron scattering were measured over the energy range 9.3–10.3 eV with an energy width of about 13 meV at scattering angles between 10° and 180°. Using several sets of elastic scattering phase shifts, a detailed analysis of the sharp Kr⁻($4p^5 5s^2 ^2$ $P_{3/2}$) resonance was carried out, resulting in a resonance width of Γ3/2 = 3.6(2) meV. By direct comparison with the position of the Ar⁻($3p^5 4s^2 ^2P_{3/2}$) resonance, the energy for the Kr⁻($4p^5 5s^2 ^2P_{3/2}$) resonance was determined as E3/2 = 9.489(3) eV. A Fano-type fit of the higher lying Kr⁻($4p^5 5s^2 ^2P_{1/2}$) resonance yielded the resonance parameters Γ1/2 = 33(5) meV and E1/2 = 10.126(4) eV. In order to obtain additional insights, B-spline R-matrix calculations were performed for both the elastic and the inelastic cross sections above the threshold for $4p^5$ ,5s excitation. They provide the total and angle-differential cross sections for excitation of long-lived and short-lived levels of the $4p^5$, 5s configuration in Kr and branching ratios for the decay of the Kr⁻($4p^5 5s^2 ^2P_{1/2}$) resonance into the three available exit channels. The results are compared with selected experimental data.
Ruf, M.-W.
Fachbereich Physik, Technische Universität KL, Kaiserslautern, Germany
Hotop, Hartmut
Fachbereich Physik, Technische Universität KL, Kaiserslautern, Germany
Zatsarinny, O.
Department of Physics and Astronomy, Drake University, Des Moines, USA
Bartschat, K.
Department of Physics and Astronomy, Drake University, Des Moines, USA
Allan, Michael
Department of Chemistry, University of Fribourg, Switzerland
Journal of Physics B: Atomic, Molecular and Optical Physics
2010/43/8/085206
http://dx.doi.org/10.1088/0953-4075/43/8/085206
Published version
all_nlk.pdf
application/pdf
1174211
http://doc.rero.ch/record/18128/files/all_nlk.pdf
order:1
pdf
Faculté des sciences
Physique
Décanat, Ch. du Musée 6A, 1700 Fribourg
Université de Fribourg
Fribourg
doc.support@rero.ch
POSTPRINT
UNIFR
ART_JOURNAL
20100429103748-WX