We are very pleased to inform you that we will organize the ASR2007 Symposium, an international symposium on "Charged Particle and Photon Interactions with Matter" to be held on November 6-9, 2007 at the Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA) in Tokai. The ASR2007 Symposium is planned with a scientific scope which is based on that of the book entitled "Charged Particle and Photon Interactions with Matter. Chemical, Physicochemical, and Biological Consequences with Applications." edited by A. Mozumder and Y. Hatano, Marcel Dekker, Inc., New York (2004) (with 870 pages for 27 chapters, ISBN: 0-8247-4623-6) and intended to discuss the state of the art and future perspectives of the entitled research fields. For more information about this book, please consult this webpage. Cover pages and table of contents of this book can be read and downloaded from here. The topics that will be discussed are primary and fundamental processes of the interaction of ionizing radiation with matter including the interactions with interface, heterogeneous systems, supercritical water, and DNA/other biological systems. The interaction of exotic particles with matter, ultrafast pulse radiolysis, and industrial and medical applications will be also discussed. An important goal of the meeting will be stimulating interdisciplinary discussion and information exchanges among the participants particularly on fundamental processes in the interaction of ionizing radiation with matter highlighted in various research fields. We look forward to welcoming you to this exciting symposium and to the beautiful village of Tokai in November 2007.