Angular distributions of CH3I fragment ions under the irradiation of single pulse and trains of ultrashort laser pulses

doi:10.1088/1674-1056/22/1/013302

Abstract The angular distribution of CH₃I is investigated experimentally using a single Fourier transform-limited laser pulse and a pulse train, where a 90-fs 800-nm linearly polarized laser field with a moderate intensity of 2.8×10¹³ W/cm² is used. The dynamic alignment is demonstrated in a single pulse experiment. Moreover, a pulse train is used to optimize the molecular alignment, and the alignment degree is almost identical to that with the single pulse. The results are analysed by using chirped femtosecond laser pulses, and it demonstrates that the structure of pulse train rather than its effective duration is crucial to the molecular alignment.

Keywords: shaped femtosecond pulse molecular alignment angular distribution

Received: 11 April 2012
Revised: 13 June 2012
Accepted manuscript online:

PACS:

33.80.Rv

(Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10774056 and 10974070), the Fundamental Research Funds for the Central Universities, China (Grant No. 200903371), and the Specialized Research Fund for the Doctoral Program of Higher Education, China (Grant No. 20100061110045).

Corresponding Authors: Hu Zhan
E-mail: huzhan@jlu.edu.cn

Cite this article:

Song Yao-Dong (宋耀东), Chen Zhou (陈洲), Sun Chang-Kai (孙长凯), Hu Zhan (胡湛) Angular distributions of CH₃I fragment ions under the irradiation of single pulse and trains of ultrashort laser pulses 2013 Chin. Phys. B 22 013302

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Angular distributions of CH3I fragment ions under the irradiation of single pulse and trains of ultrashort laser pulses

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Angular distributions of CH₃I fragment ions under the irradiation of single pulse and trains of ultrashort laser pulses