1975
DOI: 10.1088/0022-3700/8/9/013
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Low energy scattering of electrons by helium atoms

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Cited by 70 publications
(13 citation statements)
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“…The fitting algorithm will give values for X", Y", and Z" instead of the real X, Y, and Z. Equations (22) tell that the apparent values of Y" and Z" are smaller than the 0 + g+py+ 4~Ĩ g The background intensity is very difficult to estimate. When the gas is cut ofI; the count rates at the detector become negligible, except sometimes at the smallest angles (18 and 26') where one can detect a contribution coming directly from the incident-electron beam, in cases where the electron optics settings are inadequate.…”
Section: Error Estimationmentioning
confidence: 99%
“…The fitting algorithm will give values for X", Y", and Z" instead of the real X, Y, and Z. Equations (22) tell that the apparent values of Y" and Z" are smaller than the 0 + g+py+ 4~Ĩ g The background intensity is very difficult to estimate. When the gas is cut ofI; the count rates at the detector become negligible, except sometimes at the smallest angles (18 and 26') where one can detect a contribution coming directly from the incident-electron beam, in cases where the electron optics settings are inadequate.…”
Section: Error Estimationmentioning
confidence: 99%
“…For instance, an increasing number of physical targets (5-, 11 -, 19-, 29-) states of /(-matrix calcula tions of the Belfast group (Berrington etal. [20,21 ], Berrington and Kingston [22], Sawey et al [23]) were carried out. Sawey and Berrington carried out a 29-state /(-matrix calculation [24] providing total collision strengths for all L S transitions among the lowest 19 (n ^ 4) states, which are valuable for astrophysics.…”
Section: Introductionmentioning
confidence: 99%
“…First, the theoretical results disagree greatly in this case (see Ref. [17]), and the Born approximation, on the other hand, surely is not competitive in this energy region. Second, as far as we know, no ex perimental data have been published for this tran sition, although measurements should be feasible with the present experimental technique.…”
Section: *S -» 2*p Transition Partial Cross Sectionsmentioning
confidence: 81%
“…The eigenphase analysis in [10] (and in [17], too) points also in that direction, but no definite statement about the actual nature of an eventual singularity can be made at present. Since we have obtained a small value for the imaginary part of A ( = 0.173), which is rather sensitive to the choice of the atomic wave functions, it would be pretentious to make use of the calculated value in predicting the ratio of the relative positions of eventual maxima (minima) of the cross sections.…”
Section: Discussionmentioning
confidence: 97%
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