Assignment and interpretation of the sum-frequency generation vibrational spectra (SFG-VS) depend on the ability to measure and understand the factors affecting the SFG-VS spectral line shape accurately and reliably. In the past, the formulation of the polarization selection rules for SFG-VS and the development of the sub-wavenumber high-resolution broadband SFG-VS (HR-BB-SFG-VS) have provided solutions for many of these needs. However, despite these advantages, HR-BB-SFG-VS have not been widely adopted. The majority of SFG measurements so far still relies on the picosecond (ps) scanning SFG-VS or the conventional broadband SFG-VS (BB-SFG-VS) with the spectral resolution around (mostly above) 10 cm−1, which also results in less ideal spectral line shape in the SFG spectra due to the temporal and chirp effects of the laser pulses used in experiment. In this study, the temporal and the chirp effects of laser pulses with different profiles in the SFG experiment on the measured SFG-VS spectral line shape are examined through spectral simulation. In addition, the experimental data of a classical model system, i.e., octadecyltrichlorosilane monolayer on glass, obtained from the ps scanning SFG-VS, the BB-SFG-VS, and the HR-BB-SFG-VS measurements are directly compared and examined. These results show that temporal and chirp effects are often significant in the conventional BB-SFG-VS, resulting in line shape distortions and peak position shifts besides spectral broadening. Such temporal and chirp effects are less significant in the ps scanning SFG-VS. For the HR-BB-SFG-VS, spectral broadening and temporal and chirp effects are insignificant, making HR-BB-SFG-VS the choice for accurate and reliable measurement and analysis of SFG-VS.
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28 May 2022
Research Article|
May 31 2022
Temporal and chirp effects of laser pulses on the spectral line shape in sum-frequency generation vibrational spectroscopy
Special Collection:
Time-resolved Vibrational Spectroscopy
Hui Wang
;
Hui Wang
1
Department of Chemistry, Fudan University
, 220 Handan Road, Shanghai 200433, China
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Xiao-Hua Hu
;
Xiao-Hua Hu
1
Department of Chemistry, Fudan University
, 220 Handan Road, Shanghai 200433, China
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Hong-Fei Wang
Hong-Fei Wang
a)
1
Department of Chemistry, Fudan University
, 220 Handan Road, Shanghai 200433, China
2
School of Sciences, Westlake University
, 18 Shilongshan Road, Hangzhou, Zhejiang Province 310024, China
3
Institute of Natural Sciences, Westlake Institute for Advanced Study
, 18 Shilongshan Road, Hangzhou, Zhejiang Province 310024, China
a)Author to whom correspondence should be addressed: wanghongfei@westlake.edu.cn
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a)Author to whom correspondence should be addressed: wanghongfei@westlake.edu.cn
Note: This paper is part of the JCP Special Topic on Time-Resolved Vibrational Spectroscopy.
J. Chem. Phys. 156, 204706 (2022)
Article history
Received:
February 17 2022
Accepted:
May 06 2022
Citation
Hui Wang, Xiao-Hua Hu, Hong-Fei Wang; Temporal and chirp effects of laser pulses on the spectral line shape in sum-frequency generation vibrational spectroscopy. J. Chem. Phys. 28 May 2022; 156 (20): 204706. https://doi.org/10.1063/5.0088506
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