**Preface to "The Modifications of Metallic and Inorganic Materials by Using Energetic Ion/Electron Beams"**

It is with great pleasure that I served as a Guest Editor for this Special Issue entitled "The Modifications of Metallic and Inorganic Materials by Using Energetic Ion/Electron Beams". This book consists of 14 original articles, 5 review papers, and 1 editorial, which show the experimental and computer simulation results for the modifications of several physical properties and lattice structures of pure metals, metallic alloys, oxides, and ceramics by using energetic ion/electron beams. In the book, the developments of ion accelerators and transmission electron microscopes used for the study of material modifications are also described.

I thank all of the authors, the reviewers, and the QuBS Editorial Board Members for their valuable contributions. I believe that many researchers will enjoy this book.

> **Akihiro Iwase** *Editor*
