Wavelength-scanning second-harmonic generation for determining absolute charge density at aqueous interfaces

2020 ◽  
Vol 45 (13) ◽  
pp. 3733
Author(s):  
Laetitia Dalstein ◽  
Jung-Ren Huang ◽  
Yu-Chieh Wen
Keyword(s):  
Second Harmonic Generation ◽  
Charge Density ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Aqueous Interfaces ◽  
Wavelength Scanning

scholarly journals Specifics About Specific Ion Adsorption from Heterodyne-Detected Second Harmonic Generation

2019 ◽  
Author(s):  
Mavis D. Boamah ◽  
Paul Ohno ◽  
Emilie Lozier ◽  
Jacqueline van Ardenne ◽  
Franz Geiger
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Alkali Halides ◽  
Fused Silica ◽  
Interfacial Chemistry ◽  
Aqueous Interfaces ◽  
Specific Ion Adsorption ◽  
Cation Size ◽  
Added Salt

<p>Ion specific outcomes at aqueous interfaces remain among the most enigmatic phenomena in interfacial chemistry. Here, charged fused silica/water interfaces have been probed by homodyne- and heterodyne-detected (HD) second harmonic generation (SHG) spectroscopy at pH 7 and pH 5.8 and for concentrations of LiCl, NaCl, NaBr, NaI, KCl, RbCl, and CsCl ranging from 10 mM to several 100 mM. For ionic strengths around 0.1 mM to 1 mM, SHG intensities increase reversibly by up to 15% compared to the condition of zero added salt because of optical phase matching and electrical double layer. For ionic strengths above 1 mM, use of any combination of cations and anions produces decreases in SHG response by as much as 50%, trending with ion softness when compared to the condition of zero added salt. Gouy-Chapman model fits to homodyned SHG intensities for the alkali halides studied here show charge densities increase significantly with decreasing cation size. HD-SHG measurements indicate diffuse layer properties probed by the SHG process are invariant with ion identity, while Stern layer properties, as reported by chi(2), are subject to ion specificity for the ions surveyed in this work in the order of chi(2)RbCl=1/2 chi(2)NaCl=1/4 chi(2)NaI. Supporting Information available upon request to the Corresponding Author.</p>

scholarly journals Ultrafast dynamics and structure at aqueous interfaces by second harmonic generation

1996 ◽  
Vol 205 (1-2) ◽  
pp. 167-178 ◽  
Author(s):  
X. Shi ◽  
E. Borguet ◽  
A.N. Tarnovsky ◽  
K.B. Eisenthal
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Ultrafast Dynamics ◽  
Aqueous Interfaces

scholarly journals Specifics About Specific Ion Adsorption from Heterodyne-Detected Second Harmonic Generation

2019 ◽  
Author(s):  
Mavis D. Boamah ◽  
Paul Ohno ◽  
Emilie Lozier ◽  
Jacqueline van Ardenne ◽  
Franz Geiger
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Alkali Halides ◽  
Fused Silica ◽  
Interfacial Chemistry ◽  
Aqueous Interfaces ◽  
Specific Ion Adsorption ◽  
Cation Size ◽  
Added Salt

<p>Ion specific outcomes at aqueous interfaces remain among the most enigmatic phenomena in interfacial chemistry. Here, charged fused silica/water interfaces have been probed by homodyne- and heterodyne-detected (HD) second harmonic generation (SHG) spectroscopy at pH 7 and pH 5.8 and for concentrations of LiCl, NaCl, NaBr, NaI, KCl, RbCl, and CsCl ranging from 10 mM to several 100 mM. For ionic strengths around 0.1 mM to 1 mM, SHG intensities increase reversibly by up to 15% compared to the condition of zero added salt because of optical phase matching and electrical double layer. For ionic strengths above 1 mM, use of any combination of cations and anions produces decreases in SHG response by as much as 50%, trending with ion softness when compared to the condition of zero added salt. Gouy-Chapman model fits to homodyned SHG intensities for the alkali halides studied here show charge densities increase significantly with decreasing cation size. HD-SHG measurements indicate diffuse layer properties probed by the SHG process are invariant with ion identity, while Stern layer properties, as reported by chi(2), are subject to ion specificity for the ions surveyed in this work in the order of chi(2)RbCl=1/2 chi(2)NaCl=1/4 chi(2)NaI. Supporting Information available upon request to the Corresponding Author.</p>

Test of directional photoionisation models of second harmonic generation in optical fibres

1992 ◽  
Vol 139 (2) ◽  
pp. 133 ◽  
Author(s):  
N.M. Lawandy ◽  
T.J. Driscoll ◽  
C.L. Adler ◽  
N.M. Lawandy
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Optical Fibres
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