| 柱对称等离子体中逃逸概率近似表达式 |
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| 引用本文： | 蓝可,张毓泉.柱对称等离子体中逃逸概率近似表达式[J].计算物理,1995,12(3):401-406. |
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| 作者姓名： | 蓝可 张毓泉 |
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| 作者单位： | 北京应用物理与计算数学研究所, 北京8009 信箱, 100088 |
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| 摘 要： | 柱对称等离子体中谱线逃逸概率公式含有五重复杂的数值积分.采用源缓交近似又速度线性近似,对多普勒线型,由中间值定理给出逃逸概率近似表达式.近似表达式为含误差函数的一重高斯型积分,数值计算大大化简.对物理上感兴趣的速度常数项与线性项之比绝对值<1,且逃逸概率>0.1的情况,近似表达式误差最大不超过7%;速度常数项为零时,误差<1%.
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| 关 键 词： | 逃逸概率 柱对称等离子体 |
| 收稿时间： | 1994-03-29 |
| 修稿时间： | 1995-02-11 |
APPROXIMATE EXPRESSION FOR ESCAPE PROBABILITY IN A CYLINDRICALLY EXPANDING MEDIUM |
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| Lan Ke,Zhang Yuquan.APPROXIMATE EXPRESSION FOR ESCAPE PROBABILITY IN A CYLINDRICALLY EXPANDING MEDIUM[J].Chinese Journal of Computational Physics,1995,12(3):401-406. |
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| Authors: | Lan Ke Zhang Yuquan |
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| Institution: | Institute of applied Physics and Computational Mathematics, P. O. Box 8009, Beijing 100088 |
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| Abstract: | An approximate expression for escape probability for Doppler Profile lines in a cylindrically expanding medium is obtained in this paper. The complicated quintuple integral griving escape probability is approximated by a simple integral which has a Gauss-shaped integrand. The largest error is no more than 7%. |
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| Keywords: | escape probability exanding cylindrical medium |
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