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Tracking coherent low frequency vibrational information of Rh101 in ground and excited electronic states by broadband transient grating spectroscopy |
| Wei Zhang(张伟)1, Xiao-Song Liu(刘小嵩)1, Zan-Hao Wang(王赞浩)1, Yun-Fei Song(宋云飞)2, Yan-Qiang Yang(杨延强)1,2 |
1 Department of Physics, Harbin Institute of Technology, Harbin 150001, China;
2 National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China |
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Abstract Time- and frequency-resolved broadband transient grating (BB-TG) spectroscopy is used to distinguish between ground- and excite-electronic state vibrational coherence at different wavelengths. Qualitative theoretical analysis using double-sided Feynman diagrams indicates that a superposition of ground and excited state vibrational coherence are contained in the ground state absorption (GSA) and stimulated emission (SE) overlap band, while only the excited state is contained in the excited state absorption (ESA) band. The TG experiment, in which a white light continuum (WLC) is adopted as a probe, is conducted with rhodamine101 (Rh101+) as the target molecule. Fourier analysis of TG dynamics in a positive delay time range at specific wavelengths enables us to distinguish the low-frequency vibrational modes of Rh101 in ground- and excite-electronic states.
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Received: 17 April 2018
Revised: 28 September 2018
Accepted manuscript online:
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PACS:
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33.15.Mt
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(Rotation, vibration, and vibration-rotation constants)
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33.20.Tp
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(Vibrational analysis)
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33.20.-t
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(Molecular spectra)
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36.20.Ng
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(Vibrational and rotational structure, infrared and Raman spectra)
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| Fund: Project supported by the Science Challenge Project, China (Grant No. TZ2016001) and the National Natural Science Foundation of China (Grant No. 21673211). |
Corresponding Authors:
Yan-Qiang Yang
E-mail: yqyang@hit.edu.cn
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Cite this article:
Wei Zhang(张伟), Xiao-Song Liu(刘小嵩), Zan-Hao Wang(王赞浩), Yun-Fei Song(宋云飞), Yan-Qiang Yang(杨延强) Tracking coherent low frequency vibrational information of Rh101 in ground and excited electronic states by broadband transient grating spectroscopy 2018 Chin. Phys. B 27 123301
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