Studies of molecular adsorbates at interfaces by optical second-harmonic generation. [p-nitrobenzoic acid]

Conference · Wed Dec 01 04:00:00 EST 1982

OSTI ID:6449088

Tom, H W.K.; Heinz, T F; Shen, Y R

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 S/sub 0/ A..-->.. S/sub 2/ 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.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6449088
• Report Number(s): LBL-15485; CONF-830128-2; ON: DE83008395
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
400500 -- Photochemistry
ADSORPTION
AIR
ALCOHOLS
CHALCOGENIDES
DATA
DIAGNOSTIC TECHNIQUES
DYES
ELECTROMAGNETIC RADIATION
ETHANOL
EXPERIMENTAL DATA
FLUIDS
GASES
HARMONICS
HYDROXY COMPOUNDS
INFORMATION
INTERFACES
LASER RADIATION
MINERALS
NITRO COMPOUNDS
NONLINEAR OPTICS
NUMERICAL DATA
OPTICS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OSCILLATIONS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
QUARTZ
RADIATIONS
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES