کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1892320 | 1043964 | 2007 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ionization probability for multiple ionization: An assessment of the geometrical model
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
تشعشع
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Ionization probability for multiple ionization: An assessment of the geometrical model Ionization probability for multiple ionization: An assessment of the geometrical model](/preview/png/1892320.png)
چکیده انگلیسی
As X-ray spectra of multiply ionized atoms are resolved with higher resolution, the number of vacancies in outer shells-used to deduce the probability of ionization at the zero impact parameter P[0]-can be determined with increasing accuracy. The P[0] so extracted, or served as input in X-ray data analyses, has been for over two decades and almost universally compared with, or entered from, the predictions of the geometrical model of Sulik et al. [1984. Charge scaling of ionization probabilities in ion-atom collisions for zero impact parameter. J. Phys. B 17, 3239-3244] which is grounded on the binary encounter approximation (BEA). The validity of P[0] employed in the geometrical model is tested with the straight-line semiclassical approximation (SCA) at p=0. It is shown that the P[0] of Sulik et al. is reasonably close to the semiclassical P[0] when the projectile velocity v1 is in the neighborhood of the velocity of an S-shell electron v2S, but the geometrical model increasingly and significantly under- and overestimates the SCA values when, respectively, v1/v2S<1 and v1/v2S>1. This is consistent with breakdown of the geometrical model as indicated by the recent experiment of Horvat et al. [2005. L X-rays emitted from multiply ionized holmium atoms. Phys. Rev. A 71, 062709].
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Radiation Physics and Chemistry - Volume 76, Issue 3, March 2007, Pages 475-482
Journal: Radiation Physics and Chemistry - Volume 76, Issue 3, March 2007, Pages 475-482
نویسندگان
Gregory Lapicki,