High-pressure physics and high-pressure chemistry are mainly engaged in the research of high-pressure induced phase transition and high-pressure induced chemical reaction, as well as the research of fluorescence spectrum and Raman spectrum under high pressure. The synthesis of luminescent materials is mainly engaged in the synthesis and optical properties of organic complexes formed by luminescent organic small molecules and metals. Atomic lithography and atomic beam etching are devoted to the development and utilization of new self-assembled monolayer resists; Development and utilization of metastable neutral atom exposure source, preparation and characterization of silicon nanostructures on silicon surface. Research direction: mainly synthesize organic molecular crystals, and study the changes of crystal structure and molecular structure of these molecular solids under high pressure by Raman spectroscopy. Raman spectra and fluorescence spectra of benzophenone, benzoin, azobenzene, benzylhydrazine and benzophenone were measured under high pressure, and good results were obtained. This paper mainly studies the phase transition and spectral properties of organic molecular crystals under high pressure. Organic molecules are composed of different groups, and each group is composed of various atoms, which are connected by chemical bonds. There are various isomers, isomers, functional isomers, conformational isomers and so on. There are three isomers of pentane: normal, isomeric and neotectonic. There are two isomers of cyclohexane: boat isomer and chair isomer, and there are two different arrangements of hydrogen on the ring (upright bond and lodging bond). The vibration and rotation of molecules produce molecular spectra. Raman spectra show the characteristic frequencies of different groups. Moreover, with the increase of pressure, the structure of organic molecules changes, new condensed phases appear, some frequencies disappear or new Raman frequencies appear. The main intermolecular forces of organic molecules are van der Waals force and hydrogen bond. Stress can easily change its power. Under a certain pressure, the arrangement of molecules will develop towards the optimal arrangement direction, thus achieving the maximum stacking principle and bringing new photoelectric and magnetic effects to organic molecular crystals. The phase transition of organic molecules can be determined by the change of spectrum. For example, high-pressure X-rays are used to study the molecular structure under high pressure. Foreign high-pressure research institutions have studied methane and related halogenated methane, naphthalene, anthracene, hexathiophene, adamantane (urotropine), carbon 60, benzene, cyclohexane and cyclohexene. The main testing methods are differential thermal analysis, Fourier infrared spectroscopy, Raman spectroscopy, absorption spectroscopy, X-ray diffraction, neutron diffraction and other technical means. Our laboratory mainly uses Raman spectroscopy and fluorescence spectroscopy to study the structural changes and energy band changes of organic molecular crystals, and plans to add infrared spectroscopy and Raman spectroscopy to study the conformational changes. And observe the image acquisition of organic molecular crystals at different polarizer positions with the increase of pressure under the microscope, which provides intuitive judgment for the study! Study on Benzene under High Pressure: Benzene is a colorless and transparent liquid under normal temperature and pressure, and it looks apricot yellow under polarization microscope. At room temperature, with the increase of pressure, the liquid phase gradually changes into the solid phase, and the solid phase has several changes. Under the pressure of diamond anvil technology, the color changes are very beautiful through polarizing microscope observation. In addition, X-ray diffraction is used to study the structure under different pressures, and Raman spectrometer and infrared spectrometer are used to study molecular vibration and phase transition. When the phase transition occurs, the internal mode of Raman peak changes, or the interface splits, or the Raman peak disappears. There are other experimental methods used to study benzene. Bridgman was the first person to study benzene. When measuring the compression ratio of benzene, it is found that solid II (phase II of benzene) has a certain viscosity. Later, Klein et al. observed the whole phase transformation process through the transparent high-pressure window and explained it as martensite or exchange site phase transformation type. Akella and Kennedy proved the solid phase II of benzene by differential thermal analysis using high pressure technology of diamond anvil. With the development of synchrotron radiation, Piermerini and others studied the solid phase II of benzene through X-ray crystal phase, and determined that the solid phase II of benzene was a monoclinic (P2 1/c) C52h space group. There are two molecules at the position of Ci point in the cell. The phase transition conditions are: 294K, 25Kbar. Subsequent experiments proved the space groups of benzene solid phase I (Phase I)Pbcd and D52h. There are four molecules at the position of Ci point in the cell. The phase transition condition is: 294K, 14Kbar. Benzene solid phase III(Phase III) is monoclinic system, P2 1/c, and the phase transition conditions are 295K and 40Kbar. With solid phase III'(Phase III'), the phase transition conditions of benzene solid phase IV are: 295K, 1 10Kbar. We can continuously observe the phase transition process of benzene at room temperature. There is also a video of the phase transition process of benzene at room temperature and high pressure for viewing.