It appears you don't have support to open PDFs in this web browser. To view this file, Open with your PDF reader
Abstract
The authors became aware of a mistake in the original version of this Article. Specifically, an extra factor γ was incorrectly included in a number of mathematical equations and expressions. As a result of this, a number of changes have been made to both the PDF and the HTML versions of the Article. A full list of these changes is available online.
You have requested "on-the-fly" machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Show full disclaimer
Neither ProQuest nor its licensors make any representations or warranties with respect to the translations. The translations are automatically generated "AS IS" and "AS AVAILABLE" and are not retained in our systems. PROQUEST AND ITS LICENSORS SPECIFICALLY DISCLAIM ANY AND ALL EXPRESS OR IMPLIED WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES FOR AVAILABILITY, ACCURACY, TIMELINESS, COMPLETENESS, NON-INFRINGMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Your use of the translations is subject to all use restrictions contained in your Electronic Products License Agreement and by using the translation functionality you agree to forgo any and all claims against ProQuest or its licensors for your use of the translation functionality and any output derived there from. Hide full disclaimer
Details

1 École Polytechnique Fédérale de Lausanne, Institute of Physics, Laboratory for Ultrafast Microscopy and Electron Scattering (LUMES), Lausanne, Switzerland (GRID:grid.5333.6) (ISNI:0000000121839049)
2 École Polytechnique Fédérale de Lausanne, Institute of Physics, Laboratory for Ultrafast Microscopy and Electron Scattering (LUMES), Lausanne, Switzerland (GRID:grid.5333.6) (ISNI:0000000121839049); Technion—Israel Institute of Technology, Department of Electrical Engineering, Haifa, Israel (GRID:grid.6451.6) (ISNI:0000000121102151)
3 University of Glasgow, SUPA, School of Physics and Astronomy, Glasgow, UK (GRID:grid.8756.c) (ISNI:0000 0001 2193 314X)
4 Ripon College, Ripon, USA (GRID:grid.262571.5) (ISNI:0000 0000 9821 9035)
5 The Barcelona Institute of Science and Technology, ICFO-Institut de Ciencies Fotoniques, Castelldefels, Spain (GRID:grid.473715.3); ICREA-Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain (GRID:grid.425902.8) (ISNI:0000 0000 9601 989X)