ICPEAC, the International Conference on Photonic, Electronic and Atomic Collisions (before 2000 known as the International Conference on the Physics of Electronic and Atomic Collisions), is a biennial scientific conference. It is held in late July. The first conference was held in New York City in 1958. http://iopscience.iop.org/article/10.1088/1742-6596/88/1/011001 Since then it has been held in the following locations: # Location YearI New York, NY, United States1958IIBoulder, CO, United States1961IIILondon, United Kingdom1963IVQuebec, QC, Canada1965V Leningrad, Soviet Union1967VI Cambridge, MA, United States1969VII Amsterdam, Netherlands1971VIII Belgrade, Yugoslavia1973IX Seattle, WA, United States1975X Paris, France1977XI Kyoto, Japan1979XII Gatlinburg, TN, United States1981XIII West Berlin, West Germany1983XIV Stanford, CA, United States1985XV Brighton, United Kingdom1987XVI New York, NY, United States1989XVII Brisbane, Australia1991XVIII Århus, Denmark1993XIX Whistler, BC, Canada1995XX Vienna, Austria1997XXI Sendai, Japan1999XXII Santa Fe, NM, United States2001XXIII Stockholm, Sweden2003XXIVRosario, Argentina2005XXVFreiburg, Germany2007XXVIKalamazoo, MI, United States2009XXVIIBelfast, United Kingdom2011, 27 July - 2 August http://inspirehep.net/record/1201984?ln=enXXVIIILanzhou, China2013XXIXToledo, Spain2015, 22 – 28 July https://www.nature.com/natureevents/science/events/32383-_XXIX_International_Conference_on_Photonic_Electronic_and_Atomic_Collisions_ICPEACXXXCairns, Queensland, Australia2017, 26 July - 1 August http://www.cairnsconferences.com.au/events/icpeac2017/ http://businesseventscairns.org.au/event/international-conference-photonics-electronic-atomic-collisions/XXXIDeauville, France2019, 23 – 30 JulyXXXIIVirtual Event2021, 20 – 23 JulyXXXIIIOttawa, Canada2023, 25 July – 1 AugustXXXIVSapporo, Japan2025, 29 July - 5 August
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