Molecular second harmonic generation studies of methylene blue chemisorbed onto a sulfur-modified polycrystalline platinum electrode

Campbell, Deborah J.; Higgins, Daniel A.; Corn, Robert M.

doi:10.1021/j100372a060

Cited by 75 publications

(66 citation statements)

References 1 publication

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“…As the surface is rotationally isotropic with regard to the surface normal (z direction), there are only three independent nonzero components for the surface macroscopic susceptibility tensor, namely, χ (2) zzz , χ (2) zxx , and χ (2) xzx . Based on the relationships between the S-, P-, and 45-polarized components of the harmonic intensity with three independent χ (2) tensor elements, [45][46][47][48] we have…”

Section: Shg Experimentsmentioning

confidence: 99%

Analysis of the second harmonic generation signal from a liquid/air and liquid/liquid interface

Pham

Jonchère

Dufrêche

et al. 2017

The Journal of Chemical Physics

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Three different liquid interfaces, water/air, thiophene/air, and water/thiophene, were probed using the second harmonic generation (SHG) technique. Thiophene and water have been chosen because the hyperpolarizability of these molecules has already been measured or calculated and the different values can be found in literature. We have studied the microscopic structure of these interfaces by comparing the components of the second order susceptibility tensor determined from the SHG polarization curve analysis with those determined via a molecular dynamics (MD) simulation of these interfaces. We have indeed computed the structure and orientation of water and thiophene molecules at the liquid/air and liquid/liquid (L/L) interfaces as a function of the distance from the interface. The integrated susceptibility values calculated by MD simulations agree well with SHG results and validate the choice of force fields that should permit to quantify more complex L/L interfaces.

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Section: Shg Experimentsmentioning

confidence: 99%

Analysis of the second harmonic generation signal from a liquid/air and liquid/liquid interface

Pham

Jonchère

Dufrêche

et al. 2017

The Journal of Chemical Physics

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“…[24][25][26][27] Figure 3 b shows the input polarization dependence of the SHG intensity measured at a detection analyzer angle of 458 (see the Supporting Information for experimental details and SHG data for other detection analyzer angles). [24][25][26][27] Figure 3 b shows the input polarization dependence of the SHG intensity measured at a detection analyzer angle of 458 (see the Supporting Information for experimental details and SHG data for other detection analyzer angles).…”

Section: Sobhan Sen Shoichi Yamaguchi and Tahei Tahara*mentioning

confidence: 99%

“…To examine the contribution of the molecular orientation, we performed polarization measurements of resonant SHG at a single wavelength. [24][25][26][27] Figure 3 b shows the input polarization dependence of the SHG intensity measured at a detection analyzer angle of 458 (see the Supporting Information for experimental details and SHG data for other detection analyzer angles). A glimpse at the raw data reveals that they are very similar for C-1, C-110, and C-6H, which indicates similar E N T values, and the data for C-314 and C-338 are different from one to another as well as from the others.…”

Section: Sobhan Sen Shoichi Yamaguchi and Tahei Tahara*mentioning

confidence: 99%

Different Molecules Experience Different Polarities at the Air/Water Interface

2009

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Split the difference: Interface‐selective nonlinear spectroscopy disclosed that five coumarin derivatives exhibit significantly different solvachromatic shifts at the air/water interface, revealing that structurally different molecules experience notably different local effective polarities (${{{\rm E}_{\rm{{\rm T}}}^{\rm{{\rm N}}} }}$), even at the same water interface (see picture; arrows indicate transition dipole moments).

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“…SFG studies of amphiphiles at the vapor/liquid interface have reported measurements of the contributing nonlinear susceptibility elements and the molecular angle of terminal CN head groups with respect to the surface normal. 27 In addition, the molecular orientation of methylene blue molecules chemisorbed on platinum electrodes, 28 and monolayer films at liquid-liquid interfaces 29 has been studied with the related technique, second harmonic generation ͑SHG͒. Measuring both the polarization and spectral dependence defines the orientational distribution of probed species and makes SFG a powerful spectroscopic method.…”

Section: Introductionmentioning

confidence: 99%

Sum frequency generation orientation analysis of molecular ammonia on the surface of concentrated solutions

Simonelli¹,

Shultz²

2000

The Journal of Chemical Physics

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Articles you may be interested in "Up" versus "down" alignment and hydration structures of solutes at the air/water interface revealed by heterodyne-detected electronic sum frequency generation with classical molecular dynamics simulation Sum frequency generation surface spectra of ice, water, and acid solution investigated by an exciton model Sum and difference frequency generation as diagnostics for leaky eigenmodes in two-dimensional photonic crystal waveguides J. Appl. Phys. 99, 023105 (2006); 10.1063/1.2161415Time-resolved vibrational optical activity measurement by the infrared-visible sum-frequency-generation with circularly polarized infrared light Ammonia-water complexes have been detected with sum frequency generation ͑SFG͒ at the liquid/ vapor interface of concentrated ammonia solutions ͑0.3x NH 3 , xϭbulk mole fraction͒. SFG spectra taken with the ssp polarization combination ͑s-polarized sum frequency signal, s-polarized visible light, p-polarized infrared beam͒ are dominated by the N-H symmetric stretch ( 1 ) at 3312 cm Ϫ1 and a weaker deformation mode (2 4 ) at 3200 cm Ϫ1 . The dangling ͑free͒ OH peak due to water at 3700 cm Ϫ1 is suppressed at this concentration, indicating that water molecules are complexed through hydrogen bonds to ammonia at the interface. The polarization dependence of 1 indicates that the NH 3 C 3 molecular axis is tilted with respect to the surface normal by р38°. Variation of the antisymmetric stretch, 3 , sum frequency signal intensity with polarization restricts the lower limit for surface ammonia tilt angles such that 25°рр38°. Based on this orientation, the structure of the ammonia-water complex is discussed.

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Molecular second harmonic generation studies of methylene blue chemisorbed onto a sulfur-modified polycrystalline platinum electrode

Cited by 75 publications

References 1 publication

Analysis of the second harmonic generation signal from a liquid/air and liquid/liquid interface

Analysis of the second harmonic generation signal from a liquid/air and liquid/liquid interface

Different Molecules Experience Different Polarities at the Air/Water Interface

Sum frequency generation orientation analysis of molecular ammonia on the surface of concentrated solutions

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