钠分子同位素替代对低温下的He-Na2冷碰撞体系转动激发积分散射截面的影响

臧华平; 李文峰; 令狐荣锋; 程新路; 杨向东

doi:10.7498/aps.60.020304

摘要

用多体刚性椭球模型计算了不同能量下氦的同位素原子4He,10He与钠的同位素分子18Na2,23Na2,37Na2 替代碰撞体系的转动激发积分散射截面.通过分析4He,10He-18Na2,23Na2,37Na2各转动激发积分散射截面的差异,总结出在钠分子的对称同位素替代情形下4He,10He -18Na2,23Na2,37Na2碰撞体系转动激发积分散射截面随钠分子转动量子数和体系约化质量变化的规律.结果表明,体系的约化质量及入射原子相对碰撞能量的变化均给体系的碰撞截面带来不同程度的影响.另外,计算了相对入射能量为100 meV时,相互作用势的不同区域对10He-18Na2,23Na2,37Na2各碰撞体系转动激发积分散射截面的贡献情况.

关键词:

Abstract

Multiple ellipsoid model is applied to the 4He,10He-18Na2,23Na2, and 37Na2collision systems, and integral cross-sections for rotational excitation and the total collision cross-sections at the incident energy of 50,100 and 200 meV are calculated. By analyzing the differences of these integral cross-sections, the change rules of the integral cross sections with the increase of rotational angular quantum number of Na2 molecule, as well as with the change of the reduced mass of symmetric isotopic substituted system are obtained. Based on the calculation, influence on the cross-sections exerted by the variations in the reduced mass of systems and in the relative incoming energy of incident atom is discussed. Moreover, at the relative incident energy of 100 meV, the contributions of different regions of the potential to integral cross-sections of rotational excitation for10He-18Na2,23Na2 and 37Na2 collision systems are investigated.

Keywords:

multiple hard-ellipsoid model /
integral cross section for rotational excitation /
sodium isotopic molecule /
ellipsoid equipotential surface

作者及机构信息

(1)四川大学原子与分子物理研究所,成都 610065; (2)四川大学原子与分子物理研究所,成都 610065; 贵州师范大学物理与电子科学学院,贵阳 550001

基金项目: 国家自然科学基金(批准号: 10974139, 10964002)、贵州省科学技术基金(批准号:黔科合J字[2009]2066 号)和高等学校博士点专项科研基金(批准号:20050610010)资助的课题.

Authors and contacts

(1)Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China; (2)Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China; School of Physics and Electronic Science, Guizhou Normal University, Guiyang 550001, China

参考文献

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[23]	Yu C R, Huang S Z, Feng E Y, Wang R K, Cheng X L, Yang X D 2006 Acta Phys. Sin. 55 2215 (in Chinese) [余春日、黄时中、凤尔银、汪荣凯、程新路、杨向东 2006 55 2215 ]
[24]	Li W F, Linghu R F, Cheng X L, Yang X D 2010 Acta Phys. Sin. 59 4591 (in Chinese) [李文峰、令狐荣锋、程新路、杨向东 2010 59 4591 ]
[25]	Brian H B 1979 Atomic Collisions Theory (Benjamin: Cummings Publishing Company Inc) p372

施引文献

[1]	Mu R W, Li Y L, Ji X M, Yin J P 2006 Acta Phys. Sin. 55 6333 (in Chinese) [沐仁旺、李雅丽、纪宪明、印建平 2006 55 6333]
[2]	Góral K, Santos L, Lewenstein M 2002 Phys. Rev. Lett. 88 170406
[3]	Sun X P, Feng Z F, Li W D, Jia S T 2007 Acta Phys. Sin. 56 5727 (in Chinese) [孙晓鹏、冯志芳、李卫东、贾锁堂 2007 56 5727]
[4]	Zhou S Y, Xu Z, Qu Q Z, Zhou S Y, Liu L, Wang Y Z 2009 Acta Phys. Sin. 58 1590 (in Chinese) [周蜀渝、徐震、屈求智、周善钰、刘亮、王育竹 2009 58 1590] 〖5] Qiu Y, He J, Wang Y H, Wang Q, Zhang T C, Wang J M 2008 Acta Phys. Sin. 57 6227 (in Chinese) [邱英、何军、王彦华、王婧、张天才、王军民 2008 57 6227]
[5]	Wu H Y, Yin L 2006 Acta Phys. Sin. 55 0490 (in Chinese) [武宏宇、尹澜 2006 55 0490]
[6]	Fioretti A, Comparat D, Crubellier A 1998 Phys. Rev. Lett. 80 4402
[7]	Donley E A, Claussen N R, Thompson S T 2002 Nature 417 529
[8]	Weinstein J D, Carvalho R, Guillet T 1998 Nature 359 148
[9]	Bethlem H L, Berden G, Meijer G 1999 Phys. Rev. Lett. 83 1558
[10]	Jochim S, Bartensein M, Altmeyer A 2003 Science 302 2101
[11]	Greiner A, Regal C A, Jin D S 2003 Nature 426 537
[12]	Bowman J M 1979 Chem. Phys. Lett. 62 309
[13]	Bowman J M, Lee K T 1979 Chem. Phys. Lett. 60 212
[14]	Schepper W, Ross U, Beck D 1979 Z. Phys. A 290 131
[15]	Schinke R, Muller W, Meyer W, McGuire P 1981 J. Chem. Phys. 74 3916
[16]	McCaffery A J 2004 Phys. Chem. Chem. Phys. 6 1637
[17]	Marks A J 1994 J. Chem. Soc. Faraday Trans. 90 2857
[18]	Clare S, Marks A J, McCaffery A J 2000 J. Phys. Chem. A 104 7181
[19]	Osborne M A, McCaffery A J 1994 J. Chem. Phys.101 5604
[20]	Shen G X, Wang R K, Linghu R F, Yang X D 2008 Acta Phys. Sin. 57 155 (in Chinese) [沈光先、汪荣凯、令狐荣锋、杨向东 2008 57 155 ]
[21]	Shen G X, Wang R K, Linghu R F, Yang X D 2009 Acta Phys. Sin. 58 3827 (in Chinese) [沈光先、汪荣凯、令狐荣锋、杨向东 2009 58 3827] 〖23] Yu C R, Wang R K, Zhang J, Yang X D 2009 Acta Phys. Sin. 58 0229 (in Chinese) [余春日、汪荣凯、张杰、杨向东 2008 57 0229]
[22]	Jiang G, Xie H P, Tan M L, Zhu Z H 2000 Acta Phys. Sin. 49 665 (in Chinese) [蒋刚、谢洪平、谭明亮、朱正和 2000 49 665 ]
[23]	Yu C R, Huang S Z, Feng E Y, Wang R K, Cheng X L, Yang X D 2006 Acta Phys. Sin. 55 2215 (in Chinese) [余春日、黄时中、凤尔银、汪荣凯、程新路、杨向东 2006 55 2215 ]
[24]	Li W F, Linghu R F, Cheng X L, Yang X D 2010 Acta Phys. Sin. 59 4591 (in Chinese) [李文峰、令狐荣锋、程新路、杨向东 2010 59 4591 ]
[25]	Brian H B 1979 Atomic Collisions Theory (Benjamin: Cummings Publishing Company Inc) p372

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