Kinetics of Chromate Adsorption and Desorption at Fused Quartz/Water Interfaces Studied by Second Harmonic Generation

2003 ◽  
Vol 107 (45) ◽  
pp. 9620-9627 ◽  
Author(s):  
Amanda L. Mifflin ◽  
Katie A. Gerth ◽  
Franz M. Geiger
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Adsorption And Desorption ◽  
Fused Quartz ◽  
Kinetics Of

scholarly journals Second-Harmonic Generation Imaging of Membrane Potential with Photon Counting

2008 ◽  
Vol 14 (6) ◽  
pp. 526-531 ◽  
Author(s):  
Jiang Jiang ◽  
Rafael Yuste
Keyword(s):  
Membrane Potential ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Photon Counting ◽  
Analog Voltage ◽  
Second Harmonic Generation Imaging ◽  
Kinetics Of ◽  
Small Voltage ◽  
Pulse Variation

AbstractSecond-harmonic generation (SHG) can be used for imaging membrane potential in neurons, but poor signal-to-noise (S/N) limits accurate measurements of small voltage transients. We use photon counting to improve the S/N of weak SHG signal detection. Photon counting generates shot-noise limited and integrable signals, eliminates pulse-to-pulse variation, and built-in discriminators reduces the background to practically zero. In single trials, by using photon counting, we obtain a more than a twofold S/N increase over analog voltage detection. Trial-to-trial variability is also reduced by 50%. Finally, we show that, using photon counting, the kinetics of fast events such as action potentials can be recorded more accurately.

Adsorption Kinetics of Ultrathin Polymer Films in the Melt Probed by Dielectric Spectroscopy and Second-Harmonic Generation

Langmuir ◽  
2011 ◽  
Vol 27 (22) ◽  
pp. 13533-13538 ◽  
Author(s):  
Cinzia Rotella ◽  
Simone Napolitano ◽  
Stefaan Vandendriessche ◽  
Ventsislav K. Valev ◽  
Thierry Verbiest ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Adsorption Kinetics ◽  
Polymer Films ◽  
Dielectric Spectroscopy ◽  
Second Harmonic ◽  
Ultrathin Polymer Films ◽  
Kinetics Of

scholarly journals Studies of Molecular Adsorbates at Interfaces by Optical Second-Harmonic Generation

1983 ◽  
Vol 3 (1-6) ◽  
pp. 279-292 ◽  
Author(s):  
H. W. K. Tom ◽  
T. F. Heinz ◽  
Y. R. Shen
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Dye Molecules ◽  
Molecular Adsorbates ◽  
Nitrobenzoic Acid ◽  
Optical Second Harmonic Generation ◽  
Fused Quartz ◽  
Adsorbed Dye Molecules ◽  
Quartz Substrates

Optical second-harmonic generation (SHG) is surface-specific and has the sensitivity to detect submonolayers of molecules. It can be applied to study molecular adsorbates at the interface between any two centrosymmetric media. This has been demonstrated by using dye and p-nitrobenzoic acid (PNBA) molecules adsorbed on smooth fused quartz substrates as examples. With resonant SHG, the S0 → S2 transition of the adsorbed dye molecules was measured. From the polarization dependence of the SHG, the orientation of PNBA at both the air/quartz and the ethanol/quartz interfaces was deduced. By varying the concentration of PNBA in ethanol, an adsorption isotherm for PNBA at the ethanol/quartz interfaces was also obtained.

Sign in / Sign up

Export Citation Format

Share Document