不同气氛下多孔硅中电子偶素湮没行为研究

李卓昕; 王丹妮; 王宝义; 薛德胜; 魏龙; 秦秀波

doi:10.7498/aps.59.6647

摘要

使用正电子湮没谱学方法,在不同气氛下对电化学腐蚀法制备的多孔硅中电子偶素的湮没行为进行了系统的研究.正电子湮没寿命谱测试结果表明,样品中存在长达40 ns的电子偶素湮没成分,并且进入多孔硅膜层的正电子约有80%形成电子偶素,具有非常高的电子偶素产额;在氧气气氛下,由于气体导致o-Ps发生自旋转化猝灭是使多孔硅样品中电子偶素寿命缩短的主要原因.结合正电子寿命-动量关联谱测量结果,分析了不同气氛下多孔硅样品中电子偶素湮没寿命及动量变化关系,讨论了多孔硅中电子偶素的湮没机理以及气氛对孔径计算理论模型的影响.

关键词:

Abstract

Porous silicon (PS) prepared by electrochemical etching method has been studied by positron annihilation lifetime spectroscopy (PALS) and age-momentum correlation (AMOC) measurement in different atmospheres. The longest lifetime component in PALS results is ascribed to the annihilation of positronium in cavities of PS sample. It is found that 80% of the positrons implanted in PS film have formed positronium atoms. PALS results show that the lifetime of ortho-positronium has smaller value when the sample was in oxygen gas medium compared with those in other medium. AMOC results reveal that S parameter of three lifetime components in oxygen are all bigger than that in nitrogen atmosphere. These are probably caused by the oxygen leading to the spin-conversion of positronium atoms.

Keywords:

作者及机构信息

(1)兰州大学磁学与磁性材料教育部重点实验室,兰州 730000; (2)兰州大学磁学与磁性材料教育部重点实验室,兰州 730000;中国科学院高能物理研究所,核分析技术重点实验室,北京 100049; (3)中国科学院高能物理研究所,核分析技术重点实验室,北京 100049

基金项目: 国家自然科学基金(批准号:10835006,10705031,60606011)资助的课题.

Authors and contacts

(1)Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education,Lanzhou University, Lanzhou 730000, China; (2)Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education,Lanzhou University, Lanzhou 730000, China;Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics,Chinese Academy of Sciences, Beijing 100049, China; (3)Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics,Chinese Academy of Sciences, Beijing 100049, China

参考文献

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[2]	Ito Y, Yamashina T, Nagasaka M 1975 Appl. Phys. 6 323
[3]	Ma L, Chen Z Q, Wang S J, Peng Z L, Luo X H 1997 Acta Phys. Sin. 46 2267(in Chinese)[马莉、陈志权、王少阶、彭治林、罗锡辉 1997 46 2267]
[4]	Sato K, Murakami H, Ito K, Hirata K, Kobayashi Y 2009 Mater. Sci. Forum 607 53
[5]	Kobayashi Y, Ito K, Oka T, Hirata K 2007 Radiat. Phys. Chem. 76 224
[6]	Nagashima Y, Kakimoto M, Hyodo T, Fujiwara K, Ichimura A, Chang T, Deng J, Akahane T, Chiba T, Suzuki K, McKee B T A, Stewart A T 1995 Phys. Rev. A 52 258
[7]	Eijt S W H, van Veen A, Falub C V, Escobar Galindo R, Schut H, Mijnarends P E, de Theije F K, Balkenende A R 2003 Radiat. Phys. Chem. 68 357
[8]	Yu R S, Ohdaira T, Suzuki R, Ito K, Hirata K, Sato K, Kobayashi Y, Xu J 2003b Appl. Phys. Lett. 83 4966
[9]	Jiang Z Y, Yu W Z, Huang Y J, Xia Y F, Ma S X 2006 Acta Phys. Sin. 55 3136 (in Chinese) [蒋中英、郁伟中、黄彦君、夏元复、马淑新 2006 55 3743]
[10]	Wang S J, Chen Z Q, Wang B, Wu Y C, Fang P F, Zhang Y X 2008 Applied Positron Spectroscopy (Wuhan: Science and Technology Press) p131(in Chinese) [王少阶、陈志权、王波、吴亦初、方鹏飞、张永学 2008 应用正电子谱学(武汉:湖北科学技术出版社)第130页]
[11]	Uedono A, Kawano T, Tanigawa S, Ban M, Kyoto M 1995 Nucl. Instrum. Meth. B 103 511
[12]	Suzuki N, Oonishi T, Hyodo T, Chang T 2002 Appl. Phys. A 74 791
[13]	Brandt W 1983 Positron Solid-State Physics (Amsterdam: North-Holland) p8
[14]	Stoll H, Castellaz P, Siegle A 2003 Principles and Applications of Positron&Positronium Chemistry (Singapore: World Scientific Publishing Company) p356
[15]	Kansy J 1996 Nucl. Instrum. Meth. A 374 235
[16]	Smith R L, Collins S D 1992 J. Appl. Phys. 71 8
[17]	Anto Pradeep J, Agarwal P 2008 J. Appl. Phys. 104 123515
[18]	Borghesi A, Sassella A, Pivac B, Pavesi L 1993 Solid State Commun. 87 1
[19]	Brusa R S, Deng W, Karwasz G P, Zecca A 2001 Appl. Phys. Lett. 79 1492
[20]	Dutta D, Ganguly B N, Gangopadhyay D, Mukherjee T, Dutta-Roy B 2004 J. Phys. Chem. B 108 8947
[21]	Yu W Z 2003 Positron Physics and Its Application (Bejing: Science Press) p54 (in Chinese) [郁伟中 2003 正电子物理及其应用第一版 (北京:科学出版社)第54页]
[22]	Mohamed H F M 2001 Egyptian Journal of Solids 24 41
[23]	Itoh Y, Murakami H, Kinoshita A 1996 Appl. Surf. Sci. 102 423
[24]	Castellaz P, Major J, Mujica C, Schneider H, Seeger A, Siegle A, Stoll H, Billard I 1996 J. Radioanal. Nucl. Ch. 210 457
[25]	Itoh Y, Murakami H, Kinoshita A 1994 Hyperfine Interact. 84 121
[26]	Shinohara N, Suzuki N, Chang T, Hyodo T 2001 Phys. Rev. A 64 042702
[27]	Tischler M A, Collins R T, Stathis J H, Tsang J C 1992 Appl. Phys. Lett. 60 639
[28]	Itoh Y, Murakami H, Kinoshita A 1995 Mater. Sci. Forum. 173 175
[29]	Tao S J 1972 J. Chem. Phys. 56 5499
[30]	Eldrup M, Lightbody D, Sherwood J N 1981 Chem. Phys. 63 51

施引文献

[1]	Chuang S Y, Tao S J 1971 J. Chem. Phys. 54 4902
[2]	Ito Y, Yamashina T, Nagasaka M 1975 Appl. Phys. 6 323
[3]	Ma L, Chen Z Q, Wang S J, Peng Z L, Luo X H 1997 Acta Phys. Sin. 46 2267(in Chinese)[马莉、陈志权、王少阶、彭治林、罗锡辉 1997 46 2267]
[4]	Sato K, Murakami H, Ito K, Hirata K, Kobayashi Y 2009 Mater. Sci. Forum 607 53
[5]	Kobayashi Y, Ito K, Oka T, Hirata K 2007 Radiat. Phys. Chem. 76 224
[6]	Nagashima Y, Kakimoto M, Hyodo T, Fujiwara K, Ichimura A, Chang T, Deng J, Akahane T, Chiba T, Suzuki K, McKee B T A, Stewart A T 1995 Phys. Rev. A 52 258
[7]	Eijt S W H, van Veen A, Falub C V, Escobar Galindo R, Schut H, Mijnarends P E, de Theije F K, Balkenende A R 2003 Radiat. Phys. Chem. 68 357
[8]	Yu R S, Ohdaira T, Suzuki R, Ito K, Hirata K, Sato K, Kobayashi Y, Xu J 2003b Appl. Phys. Lett. 83 4966
[9]	Jiang Z Y, Yu W Z, Huang Y J, Xia Y F, Ma S X 2006 Acta Phys. Sin. 55 3136 (in Chinese) [蒋中英、郁伟中、黄彦君、夏元复、马淑新 2006 55 3743]
[10]	Wang S J, Chen Z Q, Wang B, Wu Y C, Fang P F, Zhang Y X 2008 Applied Positron Spectroscopy (Wuhan: Science and Technology Press) p131(in Chinese) [王少阶、陈志权、王波、吴亦初、方鹏飞、张永学 2008 应用正电子谱学(武汉:湖北科学技术出版社)第130页]
[11]	Uedono A, Kawano T, Tanigawa S, Ban M, Kyoto M 1995 Nucl. Instrum. Meth. B 103 511
[12]	Suzuki N, Oonishi T, Hyodo T, Chang T 2002 Appl. Phys. A 74 791
[13]	Brandt W 1983 Positron Solid-State Physics (Amsterdam: North-Holland) p8
[14]	Stoll H, Castellaz P, Siegle A 2003 Principles and Applications of Positron&Positronium Chemistry (Singapore: World Scientific Publishing Company) p356
[15]	Kansy J 1996 Nucl. Instrum. Meth. A 374 235
[16]	Smith R L, Collins S D 1992 J. Appl. Phys. 71 8
[17]	Anto Pradeep J, Agarwal P 2008 J. Appl. Phys. 104 123515
[18]	Borghesi A, Sassella A, Pivac B, Pavesi L 1993 Solid State Commun. 87 1
[19]	Brusa R S, Deng W, Karwasz G P, Zecca A 2001 Appl. Phys. Lett. 79 1492
[20]	Dutta D, Ganguly B N, Gangopadhyay D, Mukherjee T, Dutta-Roy B 2004 J. Phys. Chem. B 108 8947
[21]	Yu W Z 2003 Positron Physics and Its Application (Bejing: Science Press) p54 (in Chinese) [郁伟中 2003 正电子物理及其应用第一版 (北京:科学出版社)第54页]
[22]	Mohamed H F M 2001 Egyptian Journal of Solids 24 41
[23]	Itoh Y, Murakami H, Kinoshita A 1996 Appl. Surf. Sci. 102 423
[24]	Castellaz P, Major J, Mujica C, Schneider H, Seeger A, Siegle A, Stoll H, Billard I 1996 J. Radioanal. Nucl. Ch. 210 457
[25]	Itoh Y, Murakami H, Kinoshita A 1994 Hyperfine Interact. 84 121
[26]	Shinohara N, Suzuki N, Chang T, Hyodo T 2001 Phys. Rev. A 64 042702
[27]	Tischler M A, Collins R T, Stathis J H, Tsang J C 1992 Appl. Phys. Lett. 60 639
[28]	Itoh Y, Murakami H, Kinoshita A 1995 Mater. Sci. Forum. 173 175
[29]	Tao S J 1972 J. Chem. Phys. 56 5499
[30]	Eldrup M, Lightbody D, Sherwood J N 1981 Chem. Phys. 63 51

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