NON-DESTRUCTIVE DETECTION OF MONO-MOLECULAR-LAYER FORMATION OF FUNCTIONAL ORGANIC MOLECULES BY MEANS OF LOW-ENERGY-ELECTRON TRANSMISSION

(1)证实了利用最简单的电子能谱技术——低能电子透射光谱（leet）可以定量研究晶体表面的洁净度。(2)在不引入辐射损伤的情况下，利用LEET可以在MoS_2晶体表面灵敏地检测到酞菁、BTQBT [bis（1,2,5-噻二唑）-对喹啉（1,3-二噻唑）]和C_<60>的有序单分子层生长。(3)采用角分辨光电子能谱、高分辨电子能量损失能谱、低能电子衍射和潘宁电离电子能谱测定了酞菁和酞菁在MoS_2表面上的薄膜的分子取向和二维结构。这些方法得到的结果与leet法一致。(4)对于乙酰酞菁，我们发现在膜外突出的ci原子处于最稳定的单分子层状态。

(1) IT WAS CONFIRMED THAT THE CLEANLINESS OF CRYSTAL SURFACE CAN BE QUANTITATIVELY STUDIED BY LOW-ENERGY ELECTRON TRANSMISSION SPECTROSCOPY (LEET) WHICH IS THE SIMPLEST ELECTRON SPECTROSCOPIC TECHNIQUE.(2) THE GROWTH OF WELL ORDERED MONO-MOLECULAR LAYER ON MoS_2 CRYSTAL SURFACE COULD BE DETECTED SENSITIVELY WITH LEET FOR PHTHALOCYANINE'S,BTQBT [bis (1,2,5-thiadiazolo) -p-quinobis (1,3-dithiole)] AND C_<60> WITHOUT INTRODUCING RADIATION DAMAGES INTO THE FILMS.(3) THE MOLECULAR ORIENTATION AND TWO-DIMENSIONAL STRUCTURE OF THIN FILMS OF PHTHALOCYANINE'S AND BEQBT ON MoS_2 SURFACES WERE DETERMINED WITH ANGLE-RESOLVED PHOTOELECTRON SPECTROSCOPY,HIGH-RESOLUTION ELECTRON ENERGY LOSS SPECTROSCOPY,LOW-ENERGY ELECTRON DIFFRACTION AND PENNING IONIZATION ELECTRON SPECTROSCOOPY.THE RESULTS OBTAINED BY THESE METHODS WERE CONSISTENT WITH THOSE BY LEET.(4) FOR AICI-PHTHALOCYANINE,WE FOUND THAT THE CI ATOM PROTRUDING OUTSIDE THE FILM SURFACE IN THE MOST STABLE STATE OF THE MONO-MOLECULAR LAYER.