The International Conference on Spectroscopic Ellipsometry (ICSE) is the largest and best-known international conference on spectroscopic ellipsometry and related techniques. Since the first ICSE held in 1993, the conference has been the place where new advances and developments in ellipsometry are discussed with a variety of international participants from many different countries. 

　　The 9th International Conference on Spectroscopic Ellipsometry will be held in Beijing, China from May 22nd to 28th, 2022. The 9th International Conference on Spectroscopic Ellipsometry continues the well-established ICSE series to provide an excellent forum for scientists and engineers working in instrumentation, science and applications of spectroscopic ellipsometry and related techniques. 

　　ICSE-9 will bring together international participants from many countries and offer them the opportunity to present their latest results. Both young and experienced researchers are kindly invited to participate and interact for dissemination, discussion, and advancement of science and technology topics represented in ICSE-9.  

　　Last year, we announced our plans to create a hybrid conference, and we were very much looking forward to having an onsite meeting in Beijing in addition to an online component. Due to the continuing impact of the COVID-19 pandemic on people throughout the world, we have decided to switch the congress to a fully online meeting.