Selective excitation of the molecular rotational wave packet by two time-delayed laser pulses

doi:10.1088/1674-1056/20/12/123302

中国物理B ›› 2011, Vol. 20 ›› Issue (12): 123302-123302.doi: 10.1088/1674-1056/20/12/123302

• ATOMIC AND MOLECULAR PHYSICS • 上一篇下一篇

Selective excitation of the molecular rotational wave packet by two time-delayed laser pulses

徐淑武, 黄云霞, 纪宪明

Xinglin College, Nantong University, Nantong 226007, China

收稿日期:2011-06-20 修回日期:2011-07-21 出版日期:2011-12-15 发布日期:2011-12-15
基金资助:
Project supported by the Natural Science Foundation of Jiangsu Province of China (Grant No. BK2008183) and the Open Research Fund of State Key Laboratory of Precision Spectroscopy, East China Normal University.

Selective excitation of the molecular rotational wave packet by two time-delayed laser pulses

Xu Shu-Wu(徐淑武), Huang Yun-Xia(黄云霞), and Ji Xian-Ming(纪宪明)^†

Xinglin College, Nantong University, Nantong 226007, China

Received:2011-06-20 Revised:2011-07-21 Online:2011-12-15 Published:2011-12-15
Supported by:
Project supported by the Natural Science Foundation of Jiangsu Province of China (Grant No. BK2008183) and the Open Research Fund of State Key Laboratory of Precision Spectroscopy, East China Normal University.

摘要/Abstract

摘要： In this paper, we investigate the control of the molecular wave packet of a linear molecule by two femtosecond laser pulses. It is shown that the odd and the even rotational wave packets created by a single laser pulse can be selectively excited by accurately controlling the time delay of another laser pulse. By inserting the peak of the second laser pulse at the position of maximum or minimum value around quarter or three quarter rotational period of the slope curve with odd (or even) rotational wave packet contribution that is created by the first laser pulse, the odd rotational wave packet can be enhanced (or suppressed) while the even rotational wave packet is suppressed (or enhanced). As a result, the molecular alignments around quarter and three quarter rotational periods can be obtained. Moreover, it is also shown that by inserting the second laser pulse around the quarter or three quarter rotational periods, the changes in the maximum degree of the molecular alignment for the odd and the even rotational wave packet contributions are consistent with their corresponding slope curves at these positions.

Abstract: In this paper, we investigate the control of the molecular wave packet of a linear molecule by two femtosecond laser pulses. It is shown that the odd and the even rotational wave packets created by a single laser pulse can be selectively excited by accurately controlling the time delay of another laser pulse. By inserting the peak of the second laser pulse at the position of maximum or minimum value around quarter or three quarter rotational period of the slope curve with odd (or even) rotational wave packet contribution that is created by the first laser pulse, the odd rotational wave packet can be enhanced (or suppressed) while the even rotational wave packet is suppressed (or enhanced). As a result, the molecular alignments around quarter and three quarter rotational periods can be obtained. Moreover, it is also shown that by inserting the second laser pulse around the quarter or three quarter rotational periods, the changes in the maximum degree of the molecular alignment for the odd and the even rotational wave packet contributions are consistent with their corresponding slope curves at these positions.

Key words: molecular rotational wave packet, selective excitation, slope curve

中图分类号: (Photon interactions with molecules)

33.80.-b

37.10.Vz (Mechanical effects of light on atoms, molecules, and ions) 42.50.Wk (Mechanical effects of light on material media, microstructures and particles)

徐淑武, 黄云霞, 纪宪明. Selective excitation of the molecular rotational wave packet by two time-delayed laser pulses[J]. 中国物理B, 2011, 20(12): 123302-123302.

Xu Shu-Wu(徐淑武), Huang Yun-Xia(黄云霞), and Ji Xian-Ming(纪宪明) . Selective excitation of the molecular rotational wave packet by two time-delayed laser pulses[J]. Chin. Phys. B, 2011, 20(12): 123302-123302.

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Selective excitation of the molecular rotational wave packet by two time-delayed laser pulses

Selective excitation of the molecular rotational wave packet by two time-delayed laser pulses

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