Abstract

A new laser method of detection and examination of electron spectra of molecules, adsorbed onto the surface of a solid, based on resonant rotation of a radiation polarization plane in a magnetic field is considered. The relations describing the dependence of a rotation angle on frequency, magnetic-field strength, and absorption coefficient are presented. The modulation technique is described for measuring small angles (<10⁻⁶ rad) of polarization-plane rotation in a reflecting scheme. Experiments have been made of molecular bromine adsorbed onto the surface of polycrystalline Ge at low temperatures. For λ = 514.5 nm (Ar⁺ laser) at P = 100 mW, the detection sensitivity was ~2 monolayers. A spectrum of resonant magnetic rotation in thin films of molecular Br has been obtained in the 570–610-nm range by using the radiation from a cw dye laser. A possibility is discussed of using the method in ultrasensitive spectroscopy of adsorbed molecules and to control surface contaminations.

© 1985 Optical Society of America

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