Welcome

Welcome to ICPEAC2025, the XXXIV International Conference on Photonic, Electronic and Atomic Collisions, held in Sapporo, Hokkaido, Japan. It is held from 29 July to 5 August 2025 at the Sapporo Convention Centre in the heart of the city.

The ICPEAC covers collisions involving photons, electrons, atoms, ions, molecules, clusters, surfaces, and exotic particles, and extends dramatically to the forefront of the developments in ultracold, attosecond, and strong-field atomic and molecular physics and related areas. The scientific program of the ICPEAC XXXIV includes tutorials and plenary lecturers, progress reports, and hot topics selected by the International Program Committee. More than several hundred posters are presented. The ICPEAC conference series began in New York, USA, in 1958 and has been held every other year since 1961. This is the third time it has been held in Japan, following Kyoto in 1979 and Sendai in 1999. Sapporo is one of the largest cities in Japan, located in the heart of the northern island Hokkaido.

The conference was approved at the 31st ICPEAC held at Deauville, France in 2019. Since then, careful preparations have continued to welcome participants from all over the world: more than a hundred of the local committee members and friends have come together to make it a great conference. After a long period of various difficulties due to the COVID-19, we are back to the on-site conference. We believe in the importance of the meeting where participants getting together from different locations can communicate directly with each other and exchange variable information. The role of direct communication has not lost its significance but rather has increased despite the availability of modern tools such as web-conference devices or various social network services.

We guarantee the safe and comfortable atmosphere of Japan with relatively stable commodity prices so far. You can also enjoy another aspect of our country at Hokkaido by getting in touch with nature in Hokkaido and having a cultural experience that includes delicious food and drink. See you soon at Sapporo.

Chair and vice-chairs of the local organizing committee
Toshiyuki Azuma
Kenichi Ishikawa
Masahiko Takahashi
Naoki Watanabe