研究论文

双色脉冲场量子调控H2+的光电离动力学

  • 张季 ,
  • 姚洪斌
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  • 新疆工程学院新能源材料重点实验室, 乌鲁木齐 830091
张季,副教授,研究方向为分子强场动力学,电子信箱:63999891@qq.com

收稿日期: 2015-07-01

  修回日期: 2015-09-21

  网络出版日期: 2016-04-28

基金资助

新疆维吾尔自治区自然科学基金项目(2013211B32)

Quantum control of ionization dynamics of H2+ with an intense two-color field

  • ZHANG Ji ,
  • YAO Hongbin
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  • Laboratory of New Energy and Materials, Xinjiang Institute of Engineering, Urumqi 830091, China

Received date: 2015-07-01

  Revised date: 2015-09-21

  Online published: 2016-04-28

摘要

利用精确求解核与电子运动的三维含时量子波包法,理论研究了双色激光脉冲场(790-395 nm)量子调控H2+的光电离动力学方案。与单色场790 nm和395 nm相比,H2+在双色脉冲场(790-395 nm)中的电离几率明显增强。通过改变双色脉冲场的初始相位差,H2+的光电离产物的空间非对称性分布几率可达52%。该调控方案的理论机理是通过精确操控激光场的瞬间波形,使其电场强度在正、负方向上的非对称性达到最大值,进而达到对光电离动力学过程的高效调控。通过系统分析活跃电子在强场缀饰势阱中的运动,阐明了H2+的光电离几率和产物空间分布随电场强度的变化关系。该研究结果将为后续的量子调控光电离动力学实验提供科学的理论预测和指导。

本文引用格式

张季 , 姚洪斌 . 双色脉冲场量子调控H2+的光电离动力学[J]. 科技导报, 2016 , 34(7) : 90 -93 . DOI: 10.3981/j.issn.1000-7857.2016.07.007

Abstract

An efficient scheme for controlling the photoionization of H2+ is investigated by using an accurate 3D time-dependent wavepacket method. Compared with the one-color filed, the ionization probability of H2+ is greatly enhanced in the two-color (790-395 nm) field. By manipulating the relative carrier-envelope phase of the two-color field, the highest asymmetry modulation relative to the laser polarization reaches up to 52% in the ionization of H2+. In our control scheme, the subcycle waveform of the two-color field is manipulated to control the maixmum field amplitudes in the positive and negative directions. The sensitive dependence of the subcycle waveform in the asymmetric ionization of H2+ is explained by tracing the laser-driven motion of the electron in the dressed double well potential. In addition, the basic mechanism behind the enhanced ionization of the molecule is revealed, which provides a practical guide for the optical control of the ionization dynamics in future experiments.

参考文献

[1] Wollenhaupt M, Engel V, Baumert T. Femtosecond laser photoelectron spectroscopy on atoms and small molecules:Prototype studies in quan-tum control[J]. Annual Review of Physical Chemistry, 2005, 56:25-56.
[2] Yao H B, Zheng Y J. Quantum control of a molecular system in an in-tense field via the selective population of dressed states[J]. Physical Chemistry Chemical Physics, 2011, 13(19):8900-8907.
[3] 姚洪斌, 李文亮, 张季, 等. K2分子在强激光场下的量子调控:缀饰态选择性分布[J]. 物理学报, 2014, 63(17):178201. Yao Hongbin, Li Wenliang, Zhang Ji, et al. Quantum control of K2 mole-cule in an intense laser field:Selective population of dressed states[J]. Acta Physica Sinica, 2014, 63(17):178201.
[4] Bucksbaum P H, Zavriyev A, Muller H G, et al. Softening of the H2+ mo-lecular bond in intense laser fields[J]. Physical Review Letters, 1990, 64(16):1883-1886.
[5] Orr P A, Williams I D, Greenwood J B, et al. Above threshold dissocia-tion of vibrationally cold HD+ molecules[J]. Physical Review Letters, 2007, 98(16):163001.
[6] Esry B D, Sayler A M, Wang P Q, et al. Above threshold coulomb ex-plosion of molecules in intense laserpulses[J]. Physical Review Letters, 2006, 97(8):013003.
[7] He H X, Lu R F, Zhang P Y, et al. Dissociation and ionization compet-ing processes for H2+ in intense laser field:which one is larger?[J]. The Journal of Chemical Physics, 2012, 136(2):619-624.
[8] He H X, Lu R F, Zhang P Y, et al. Direct multi-photon ionizations of H2+ in intense laser fields[J]. Journal of Physics B, 2012, 45(8):85103-85109.
[9] Zhang Y P, Cheng C H, Kim J T, et al. Dissociation energies of molecu-lar hydrogen and the hydrogen molecular ion[J]. Physical Review Let-ters, 2004, 92(20):203003.
[10] McKenna J, Sayler A M, Gaire B, et al. Dissociation and ionization of an HD+ beam induced by intense 395 nm ultrashort laser pulses[J]. Virtual Journal of Ultrafast Science, 2009(9):023421.
[11] Yao H B, Zhao G J. Theoretical investigation of the competitive mechanism between dissociation and ionization of H2+ in intense field[J]. Journal of Physical Chemistry A, 2014, 118(39):9173-9181.
[12] Mckenna J, Anis F, Sayler A M, et al. Controlling strong-field frag-mentation of H2+ by temporal effects with few-cycle laser pulses[J]. Physical Review A, 2012, 85(2):023405.
[13] He F, Ruiz C, Becker A. Control of electron excitation and localiza-tion in the dissociation of H2+ and its isotopes using two sequential ul-trashort laser pulses[J]. Physical Review Letters, 2007, 99(8):083002.
[14] Roudnev V, Esry B D, Ben-Itzhak I. Controlling HD+ and H2+ dissoci-ation with the carrier-envelope phase difference of an intense ultra-short laser pulse[J]. Physical Review Letters, 2004, 93(16):163601.
[15] Kamta G L, Bandrauk A D. Phase dependence of enhanced ionization in asymmetric molecules[J]. Physical Review Letters, 2005, 94(6):203003.
[16] Kling M F, Siedschlag C, Verhoef A J, et al. Control of electron local-ization in molecular dissociation[J]. Science, 2006, 312(5771):246-248.
[17] Kling N G, Betsch K J, Zohrabi M, et al. Carrier-envelope phase control over pathway interference in strong-field dissociation of H2+[J]. Physical Review Letters, 2013, 111(16):163004.
[18] Hu J, Han K L, He G Z. Correlation quantum dynamics between an electron and D2+ molecule with attosecond resolution[J]. Physical Re-view Letters, 2005, 95(12):123001.
[19] Feuerstein B, Thumm U. Fragmentation of H2+ in strong 800 nm laser pulses:Initial-vibrational-state dependence[J]. Physical Review A, 2003, 67(4):043405.
[20] Li P Y, Zhao Z Y, Wang Z G, et al. Phase control of bright and dark states in four-wave mixing and fluorescence channels[J]. Applied Phys-ics Letters, 2012, 101(8):081107.
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