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本文从理论上研究了复合静电场和非共振激光场对基态(X1∑+) CO分子的取向, 分别讨论了激光场与分子的绝热作用和非绝热作用. 计算结果表明, 对于永久偶极矩较小的基态CO(X1∑+)分子, 静电场与激光场产生的隧道对的能级耦合作用可以增强基态CO分子在复合场下的取向. 在绝热情况下, 即使较弱的静电场也可以获得较好的取向效果, 而非绝热情况下, 分子取向在激光场关闭后会周期性再现. 本文还进一步研究了激光强度、电场强度和温度对取向度的影响.
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关键词:
- 取向 /
- CO (X1∑+) 分子 /
- 复合场
We investigate the orientation of the CO (X1∑+) molecules in the combined electrostatic and laser fields. We analyze the adiabatic and nonadiabatic interactions of the molecules with the applied laser field. It shows that the pendular energy levels induced by the laser field form the tunneling doublets which can be coupled by the applied electrostatic field. The CO molecules in the X1∑+ state with small permanent dipoles can be greatly orientated due to the coupling interaction. If the laser field is added adiabatically, the excellent orientation is achieved even at a weak electrostatic field. While in a nonadiabatic case, the molecular orientation reoccurs periodically when the laser field is turned off. Additionally, we study the dependence of the degree of the molecular orientation on the applied laser and electrostatic intensities and the molecular temperature.-
Keywords:
- orientation /
- CO (X1∑+) molecules /
- combined field
[1] Loesch H J, Remscheid A 1990 J. Chem. Phys. 93 4779
[2] Slenczka A, Friedrich B, Herschbach D 1994 Phys. Rev. Lett. 72 1806
[3] Stapelfeldt H, Seideman T 2003 Rev. Mod. Phys. 75 543
[4] Franks K J, Li H Z, Kong W 1999 J. Chem. Phys. 110 11779
[5] Tong A H, Liao Q, Zhou Y M, Lu P X 2011 Acta Phys. Sin. 60 043301 (in Chinese) [童爱红, 廖青, 周月明, 陆培祥 2011 60 043301]
[6] Lan P F, Lu P X, Cao W, Wang X L, Hong W Y 2007 Opt. Lett. 32 1186
[7] Pullman D P, Friedrich B, Herschbach D R 1990 J. Chem. Phys. 93 3224
[8] Lan P F, Lu P X, Cao W, Li Y H, Wang X L 2007 Phys. Rev. A 76 021801(R)
[9] Parker D H, Bernstein R B 1989 Annu. Rev. Phys. Chem. 40 561
[10] Ortigoso J, Rodriguez M, Gupta M, Friedrich B 1999 J. Chem. Phys. 110 3870
[11] Bulthuis J, Möller J, Loesch H J 1997 J. Phys. Chem. A 101 7684
[12] Friedrich B, Herschbach D 1999 J. Phys. Chem. A 103 10280
[13] Seideman T 1999 Phys. Rev. Lett. 83 4971
[14] Zhang S A, Lu C H, Jia T Q, Wang Z G, Sun Z R 2011 J. Chem. Phys. 135 034301
[15] Muramatsu M, Hita M, Minemoto S, Sakai H 2009 Phys. Rev. A 79 011403(R)
[16] Blokland J H, Riedel J, Putzke S 2011 J. Chem. Phys. 135 114201
[17] Henriksen N E 1999 Chem. Phys. Lett. 312 196
[18] Friederich B, Nahler N H, Buck U 2003 J. Mod. Opt. 50 2677
[19] Cai L, Marango J, Friedrich B 2001 Phys. Rev. Lett. 86 775
[20] Zhang S A, Lu C H, Shi J H, Jia T Q, Wang Z G, Sun Z R 2011 Phys. Rev. A 84 013408
[21] Härtelt M, Friedrich B 2008 J. Chem. Phys. 128 224313
[22] Bethlem H L, Berden G, Meijer G 1999 Phys. Rev. Lett. 83 1558
[23] Seideman T 2001 J. Chem. Phys. 115 5965
[24] Jiang H Y, Wu C Y, Zhang H, Jiang H B, Yang H, Gong Q H 2010 Opt. Express 18 8990
[25] Friedrich B, Pullman D P, Herschbach D R 1991 J. Phys. Chem. 95 8118
[26] Kjeldsen T K, Bisgaard C Z, Madsen L B 2003 Phys. Rev. A 68 063407
[27] Osterwalder A, Meek S A, Hammer G, Haak H, Meijer G 2010 Phys. Rev. A 81 051401(R)
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[1] Loesch H J, Remscheid A 1990 J. Chem. Phys. 93 4779
[2] Slenczka A, Friedrich B, Herschbach D 1994 Phys. Rev. Lett. 72 1806
[3] Stapelfeldt H, Seideman T 2003 Rev. Mod. Phys. 75 543
[4] Franks K J, Li H Z, Kong W 1999 J. Chem. Phys. 110 11779
[5] Tong A H, Liao Q, Zhou Y M, Lu P X 2011 Acta Phys. Sin. 60 043301 (in Chinese) [童爱红, 廖青, 周月明, 陆培祥 2011 60 043301]
[6] Lan P F, Lu P X, Cao W, Wang X L, Hong W Y 2007 Opt. Lett. 32 1186
[7] Pullman D P, Friedrich B, Herschbach D R 1990 J. Chem. Phys. 93 3224
[8] Lan P F, Lu P X, Cao W, Li Y H, Wang X L 2007 Phys. Rev. A 76 021801(R)
[9] Parker D H, Bernstein R B 1989 Annu. Rev. Phys. Chem. 40 561
[10] Ortigoso J, Rodriguez M, Gupta M, Friedrich B 1999 J. Chem. Phys. 110 3870
[11] Bulthuis J, Möller J, Loesch H J 1997 J. Phys. Chem. A 101 7684
[12] Friedrich B, Herschbach D 1999 J. Phys. Chem. A 103 10280
[13] Seideman T 1999 Phys. Rev. Lett. 83 4971
[14] Zhang S A, Lu C H, Jia T Q, Wang Z G, Sun Z R 2011 J. Chem. Phys. 135 034301
[15] Muramatsu M, Hita M, Minemoto S, Sakai H 2009 Phys. Rev. A 79 011403(R)
[16] Blokland J H, Riedel J, Putzke S 2011 J. Chem. Phys. 135 114201
[17] Henriksen N E 1999 Chem. Phys. Lett. 312 196
[18] Friederich B, Nahler N H, Buck U 2003 J. Mod. Opt. 50 2677
[19] Cai L, Marango J, Friedrich B 2001 Phys. Rev. Lett. 86 775
[20] Zhang S A, Lu C H, Shi J H, Jia T Q, Wang Z G, Sun Z R 2011 Phys. Rev. A 84 013408
[21] Härtelt M, Friedrich B 2008 J. Chem. Phys. 128 224313
[22] Bethlem H L, Berden G, Meijer G 1999 Phys. Rev. Lett. 83 1558
[23] Seideman T 2001 J. Chem. Phys. 115 5965
[24] Jiang H Y, Wu C Y, Zhang H, Jiang H B, Yang H, Gong Q H 2010 Opt. Express 18 8990
[25] Friedrich B, Pullman D P, Herschbach D R 1991 J. Phys. Chem. 95 8118
[26] Kjeldsen T K, Bisgaard C Z, Madsen L B 2003 Phys. Rev. A 68 063407
[27] Osterwalder A, Meek S A, Hammer G, Haak H, Meijer G 2010 Phys. Rev. A 81 051401(R)
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