Electroreflectance vibrational spectroscopy

Details Electroreflectance vibrational spectroscopy Electroreflectance vibrational spectroscopy

1982-07-22

1984-05-08

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Gas chromatography

250341, G01N 2117

Patent

active

044467192

ABSTRACT:
To measure the concentration of molecules adsorbed on metal or insulator surfaces as well as their bonding to the surface and their mutual interaction, a vibrational spectroscopy method is proposed in which the infrared absorption is modulated using a first order Stark shift of the adsorbed molecule vibrational frequency. A sample surface in a high vacuum or at atmospheric pressure is illuminated by infrared radiation from a tunable diode laser an reflected radiation is detected by an infrared sensor. A high intensity electric field normal to the surface is amplitude modulated at a given frequency and the synchronous modulation of the reflected light is measured while varying the wavelength to obtain the spectra of vibrational absorption.

REFERENCES:
patent: 4105919 (1978-08-01), Bridges et al.
patent: 4186355 (1980-01-01), Lo
patent: 4352016 (1982-09-01), Duffy et al.

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