کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1678245 | 1009936 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Field ionization of helium in a supersonic beam: Kinetic energy of neutral atoms and probability of their field ionization
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Field ionization of helium in a supersonic beam: Kinetic energy of neutral atoms and probability of their field ionization Field ionization of helium in a supersonic beam: Kinetic energy of neutral atoms and probability of their field ionization](/preview/png/1678245.png)
چکیده انگلیسی
High detection efficiency combined with spatial resolution on a nm-scale makes the field ionization process a promising candidate for spatially resolved neutral particles detection. The effective cross-sectional area Ïeff can serve as a measure for the effectiveness of such a field ion detector. In the present contribution, we combine quantum-mechanical calculations of the field-modified electron density distribution near the tungsten tip surface and of the resulting local field distributions, performed using the functional integration method, with a classical treatment of the atom trajectories approaching the tip in order to calculate the Ïeff values for ionization of free He atoms over an apex of a tungsten field emitter tip. The calculated values are compared with experimental data for supersonic He atomic beams at two different temperatures 95 and 298Â K.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultramicroscopy - Volume 109, Issue 5, April 2009, Pages 413-417
Journal: Ultramicroscopy - Volume 109, Issue 5, April 2009, Pages 413-417
نویسندگان
B. Holst, J. Piskur, P.P. Kostrobiy, B.M. Markovych, Y. Suchorski,