激光场中量子散射三重微分散射截面的研究
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摘要
在量子散射框架下,对真实激光场引进多光子相互作用准静态过程模型,考虑束缚-自由跃迁中电磁场的规范一致性及电子与激光场长程相互作用的极限,研究激光场对量子散射过程中三重微分散射截面的影响.多数共面非对称情况下激光场对三重微分散射截面有提升作用,此外靶原子处于激发态时binary峰出现分裂,激光场对三重微分散射截面也有放大作用.
Multiple- photon interaction model of quasi- static process has been introduced to real laser field,in the framework of quantum scattering. Based on the specification conformity of bound- free transitions in electromagnetic field and the limits of long- range interaction between electron and laser field,the effects of triple-differential cross section in laser field during quantum scattering process have been investigated. The results show that laser field has enhanced triple differential cross section in most coplanar asymmetric conditions. Moreover,binary peaks were split when the target atom in the excited state,laser field also has a magnifying effect on triple differential cross section.
Multiple- photon interaction model of quasi- static process has been introduced to real laser field,in the framework of quantum scattering. Based on the specification conformity of bound- free transitions in electromagnetic field and the limits of long- range interaction between electron and laser field,the effects of triple-differential cross section in laser field during quantum scattering process have been investigated. The results show that laser field has enhanced triple differential cross section in most coplanar asymmetric conditions. Moreover,binary peaks were split when the target atom in the excited state,laser field also has a magnifying effect on triple differential cross section.
引文
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[3]Ferrante G,Leone C,Trombetta F.Laser modification of the exchange scattering in electron-atom collisions[J].J.Phys.B,1982,15:L475.
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[5]Ciappina M F.Fully differential cross sections for ion-atom impact ionization in the presence of a laser field[J].J.Phys.B,2007,40:4155.
[6]Chattopadhyay A,Sinha C.Ionization of a hydrogenic ion by electron and positron impact in the presence of a laser field[J].Phys.Rev.A,2005,72:053406.
[7]Kouzakov Konstantin A,Popov Yuri V,Takahashi Masahiko.Laser-assisted electron momentum spectroscopy[J].Phys.Rev.A,2010,82:023410.
[8]Byron Jr F W,Joachain C J,Piraux B.Theory of coplanar asymmetric(e,2e)reaction in helium[J].J.Phys.B,1986,19:1201.
[9]Ciappina M F,Madsen L B.Electron emission in energetic ion-atom collisions in presence of coherent electromagnetic radiation[J].J.Phys.B,2006,39:5037.
[10]Khalil D,Maquet A,Taieb R,et al.Laser-assisted(e,2e)collisions in helium[J].Phys.Rev.A,1997,56(6):4918.
[11]Byrpn Jr F W,Francken P,Joachain C.Laser-assisted elastic electron-atom collisions[J].J.Phys.B,1987,20:5487.
[12]Joachain C J,Francken P,Maquet A,et al.(e,2e)collisions in the presence of a laser field[J].Phys.Rev.Lett.,1988,61(2):165.
[13]Martin P,Veniard V,Maquet A.Electron-impact ionization of atomic hydrogen in the presence of a laser field[J].Phys.Rev.A,1989,39(12):6178.
[14]Voitkiv A B,Ullrich J.Binary-encounter electron emission in fast atomic collisions in the presence of coherent electromagnetic radiation[J].J.Phys.B,2001,34:1673.
[15]Li S M,Berakdar J,Zhang S T,et al.Laser-assisted(e,2e)reaction in one-electron atoms and ions[J].J.Phys.B,2004,38:1291.
[16]Wallbank B,Holmes J K.Laser-assisted elastic electron-atom collisions[J].Phys.Rev.Lett.,1993,48(4):R2515.
[17]Hhr C,Dorn A,Naijjari B,et al.Electron impact ionization in the presence of a laser field:a kinematically complete(nγe,2e)experiment[J].Phys.Rev.Lett.,2005,94:153201.
[18]Hhr C,Dorn A,Naijjari B,et al.Laser-assisted electron-impact ionization of atoms[J].J.Electron.Spectrosc,2007,161:172.
[19]Ghosh Deb S,Roy S,Sinha C.Multiphoton(e,2e)process of hydrogen atom in strong laser field[J].Eur.Phys.J.D,2009,55:591.
[20]Ghosh Deb S,Sinha C.Multiphoton effects in laserassisted ionization of a helium atom by electron impact[J].Eur.Phys.J.D,2010,60:287.
[21]Ciappina Marcelo F,Madsen Lars Bojer.Laser-assisted ion-atom collisions:Plateau,cutoff,and multiphoton peaks[J].Phys.Rev.A,2008,77:023412.
[22]Voitkiv A B,Toshima N,Ullrich J.Ionization of a hydrogen by ion impact in the presence of a laser field resonant to bound-bound atomic transitions[J].J.Phys.B,2006,39:3791.
[23]Mason N J.Laser-assisted electron-atom collisions[J].Rep.Prog.Phys.,1993,56:1275.