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Polarization and experimental configuration analyses of sum frequency generation vibrational spectra, structure, and orientational motion of the air/water interface
Gan, W; Wu, D; Zhang, Z; Feng, RR; Wang, HF
Source PublicationJOURNAL OF CHEMICAL PHYSICS
2006-03-21
DOI10.1063/1.2179794
Volume124Issue:11
Indexed BySCI
SubtypeReview
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectPhysics, Atomic, Molecular & Chemical
WOS Research AreaPhysics
WOS KeywordLIQUID-VAPOR INTERFACE ; HYDROGEN-BOND DYNAMICS ; DENSITY-FUNCTIONAL THEORY ; X-RAY REFLECTIVITY ; SURFACE-ADSORPTION LAYERS ; 2ND HARMONIC-GENERATION ; ACID-WATER MIXTURES ; CH STRETCHING MODES ; MOLECULAR-DYNAMICS ; 2ND-HARMONIC GENERATION
AbstractHere we report a detailed study on spectroscopy, structure, and orientational distribution, as well as orientational motion, of water molecules at the air/water interface, investigated with sum frequency generation vibrational spectroscopy (SFG-VS). Quantitative polarization and experimental configuration analyses of the SFG data in different polarizations with four sets of experimental configurations can shed new light on our present understanding of the air/water interface. Firstly, we concluded that the orientational motion of the interfacial water molecules can only be in a limited angular range, instead of rapidly varying over a broad angular range in the vibrational relaxation time as suggested previously. Secondly, because different vibrational modes of different molecular species at the interface has different symmetry properties, polarization and symmetry analyses of the SFG-VS spectral features can help the assignment of the SFG-VS spectra peaks to different interfacial species. These analyses concluded that the narrow 3693 cm(-1) and broad 3550 cm(-1) peaks belong to C(infinity upsilon) symmetry, while the broad 3250 and 3450 cm(-1) peaks belong to the symmetric stretching modes with C(2 upsilon) symmetry. Thus, the 3693 cm(-1) peak is assigned to the free OH, the 3550 cm(-1) peak is assigned to the singly hydrogen-bonded OH stretching mode, and the 3250 and 3450 cm(-1) peaks are assigned to interfacial water molecules as two hydrogen donors for hydrogen bonding (with C(2 upsilon) symmetry), respectively. Thirdly, analysis of the SFG-VS spectra concluded that the singly hydrogen-bonded water molecules at the air/water interface have their dipole vector directed almost parallel to the interface and is with a very narrow orientational distribution. The doubly hydrogen-bonded donor water molecules have their dipole vector pointing away from the liquid phase. (c) 2006 American Institute of Physics.
Language英语
WOS IDWOS:000236160000042
Citation statistics
Cited Times:173[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/140361
Collection中国科学院大连化学物理研究所
AffiliationChinese Acad Sci, Inst Chem, State Key Lab Mol React Dynam, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Gan, W,Wu, D,Zhang, Z,et al. Polarization and experimental configuration analyses of sum frequency generation vibrational spectra, structure, and orientational motion of the air/water interface[J]. JOURNAL OF CHEMICAL PHYSICS,2006,124(11).
APA Gan, W,Wu, D,Zhang, Z,Feng, RR,&Wang, HF.(2006).Polarization and experimental configuration analyses of sum frequency generation vibrational spectra, structure, and orientational motion of the air/water interface.JOURNAL OF CHEMICAL PHYSICS,124(11).
MLA Gan, W,et al."Polarization and experimental configuration analyses of sum frequency generation vibrational spectra, structure, and orientational motion of the air/water interface".JOURNAL OF CHEMICAL PHYSICS 124.11(2006).
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