As well known, the research of interactions of intense laser with matter has become an active field of physics. When the laser field strength is comparable with the atomic unit field strength, many nonlinear physical ...As well known, the research of interactions of intense laser with matter has become an active field of physics. When the laser field strength is comparable with the atomic unit field strength, many nonlinear physical phenomena appear. In recent years, intense laser pulse interactions with molecules have attracted much attention. It aims at exploring effects of the laser intensity on chemical reaction dynamics and at studying the wave packet structure of molecular exciting state. Same as the case of atoms, molecules in intense laser field also展开更多
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 puls...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.展开更多
文摘As well known, the research of interactions of intense laser with matter has become an active field of physics. When the laser field strength is comparable with the atomic unit field strength, many nonlinear physical phenomena appear. In recent years, intense laser pulse interactions with molecules have attracted much attention. It aims at exploring effects of the laser intensity on chemical reaction dynamics and at studying the wave packet structure of molecular exciting state. Same as the case of atoms, molecules in intense laser field also
基金Project supported by the Natural Science Foundation of Jiangsu Province of China (Grant No. BK2008183)the Open Research Fund of State Key Laboratory of Precision Spectroscopy,East China Normal University
文摘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.
