At the invitation of Dr. Yannan Chu, Professor Stefan Matejcik and Dr. Michal Stano from Comenius University,Slovakia, visited the Laboratory of Environmental Spectroscopy, Anhui Institute of Optics and Fine Mechanics, on November 3th. The visitors will carry out a collaboration project between China and Slovakia in next 10 days.

　　Professor Matejcik is the director of the Experimental Physic department at ComeniusUniversity. He is a renowned expert in the field of stimulated process by gas, clustered-electrons, and has made remarkable achievements particularly in the micro scale studies on bio-molecules related with fusion plasma.