Ultrafast motion of liquids C2H4Cl2 and C2H4Br2 studied with a femtosecond laser

Jaw Luen Tang, Chen Wei Chen, Jiunn Yuan Lin, Ying-Dar Lin, Chia Chen Hsu, Tai Huei Wei, Tzer Hsiang Huang*

*Corresponding author for this work

研究成果: Article同行評審

16 引文 斯高帕斯(Scopus)

摘要

Transient optical Kerr effect of liquids C2H4Cl2 and C2H4Br2 is investigated, for the first time to our knowledge, with a femtosecond (fs) probe laser delayed with respect to a coherent fs pump laser. Coherent coupling and electronic Kerr signals are observed around zero delay when pump and probe overlap. Persisting after the pump-probe overlap are Kerr signals arising from the torsional and other intramolecular vibrations of the trans and gauche conformations; Kerr signals arising from the intermolecular motion are also observed. Vibrational quantum interference is only observed in liquid C2H4Br2 and the related beats data are fitted with the torsional vibrations, 91 cm-1 (gauche) and 132 cm-1 (trans), and the CCBr angle-bending vibrations, 231 cm-1 (gauche) and 190 cm-1 (trans), with dephasing times, 0.45 ps, 0.45 ps, 2 ps, and 1.5 ps, respectively. These vibrational frequencies agree with those obtained in the frequency-domain. That no vibrational mode is observed for C2H4Cl2 might be attributed to ineffective Raman-pumping. Kerr signals observed after the pump-probe overlap are Fourier transformed to give the spectra of the intermolecular motion and the vibrational spectrum, which agrees with the one observed in the infrared absorption and/or Raman scattering heretofore.

原文English
頁(從 - 到)669-675
頁數7
期刊Optics Communications
266
發行號2
DOIs
出版狀態Published - 15 十月 2006

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