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Homogeneous and inhomogeneous broadenings and the Voigt line shapes in the phase-resolved and intensity sum-frequency generation vibrational spectroscopy
Chen, SL (Chen, Shun-Li); Fu, L (Fu, Li); Gan, W (Gan, Wei); Wang, HF (Wang, Hong-Fei)
2016
Source PublicationJOURNAL OF CHEMICAL PHYSICS
Volume144Issue:3
AbstractIn this report, we show that the ability to measure the sub-1 cm(-1) resolution phase-resolved and intensity high-resolution broadband sum frequency generation vibrational spectra of the -CN stretch vibration of the Langmuir-Blodgett (LB) monolayer of the 4-n-octyl-4'-cyanobiphenyl (8CB) on the z-cut alpha-quartz surface allows the direct comparison and understanding of the homogeneous and inhomogeneous broadenings in the imaginary and intensity SFG vibrational spectral line shapes in detail. The difference of the full width at half maximum (FWHM) of the imaginary and intensity sum-frequency generation vibrational spectroscopy spectra of the same vibrational mode is the signature of the Voigt line shape and it measures the relative contribution to the overall line shape from the homogeneous and inhomogeneous broadenings in SFG vibrational spectra. From the phase-resolved and intensity spectra, we found that the FWHM of the 2238.00 +/- 0.02 cm(-1) peak in the phase-resolved imaginary and intensity spectra is 19.2 +/- 0.2 cm(-1) and 21.6 +/- 0.4 cm(-1), respectively, for the -CN group of the 8CB LB monolayer on the z-cut a-quartz crystal surface. The FWHM width difference of 2.4 cm(-1) agrees quantitatively with a Voigt line shape with a homogeneous broadening half width of Gamma = 5.29 +/- 0.08 cm(-1) and an inhomogeneous standard derivation width Delta omega = 5.42 +/- 0.07 cm(-1). These results shed new lights on the understanding and interpretation of the line shapes of both the phase-resolved and the intensity SFG vibrational spectra, as well as other incoherent and coherent spectroscopic techniques in general
DOI10.1063/1.4940145
Indexed BySCI
WOS IDWOS:000368619100030
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Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.xjipc.cas.cn/handle/365002/4358
Collection环境科学与技术研究室
AffiliationPacific NW Natl Lab, William R Wiley Environm Mol Sci Lab, 902 Battelle Blvd,POB 999, Richland, WA 99352 USA;Chinese Acad Sci, Lab Environm Sci & Technol, Xinjiang Tech Inst Phys & Chem, Key Lab Funct Mat & Devices Special Environm, Urumqi 830011, Peoples R China
Recommended Citation
GB/T 7714
Chen, SL ,Fu, L ,Gan, W ,et al. Homogeneous and inhomogeneous broadenings and the Voigt line shapes in the phase-resolved and intensity sum-frequency generation vibrational spectroscopy[J]. JOURNAL OF CHEMICAL PHYSICS,2016,144(3).
APA Chen, SL ,Fu, L ,Gan, W ,&Wang, HF .(2016).Homogeneous and inhomogeneous broadenings and the Voigt line shapes in the phase-resolved and intensity sum-frequency generation vibrational spectroscopy.JOURNAL OF CHEMICAL PHYSICS,144(3).
MLA Chen, SL ,et al."Homogeneous and inhomogeneous broadenings and the Voigt line shapes in the phase-resolved and intensity sum-frequency generation vibrational spectroscopy".JOURNAL OF CHEMICAL PHYSICS 144.3(2016).
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