Donald Fleming is Professor Emeritus in the Department of Chemistry, University of British Columbia, Vancouver, Canada. His research in muon science exploits mass and spin features of muon probes in the chemical sciences, mainly with a focus on exploring quantum mass effects and molecular dynamics and hyperfine coupling constants of muoniated free radicals in different environments. He was instrumental in developing a muon science program in Canada at the TRIUMF cyclotron with the building of the first muon spin spectroscopy beam line there. He is the recipient of several awards in recognition of his ongoing studies in muon science, e.g.Fellowship in the American Physical Society (2012), Alexander von Humboldt "Wiedereinladung" (2013, 2005, FU Berlin), Humboldt Research Prize (2001, Stuttgart), Glen T. Seaborg Award in Nuclear Chemistry of the American Chemical Society (2004) and the John C. Polanyi Lecture Award of the Canadian Chemical Society (2002).

Iain McKenzie is a facility scientist at the Centre for Molecular and Materials Science (CMMS) at TRIUMF in Vancouver, Canada and an adjunct professor in the Department of Chemistry at Simon Fraser University, in Burnaby, BC, Canada. He obtained his PhD with Prof. Paul Percival at Simon Fraser University, studying the structure and dynamics of novel muoniated radicals. He is a former recipient of an NSERC Post-doctoral fellowship with Prof. Emil Roduner, University of Stuttgart, where he was involved in the development of the new High Field spectrometer. His current research interests involve using muon spin spectroscopy to study molecular interactions in soft matter and organic materials and beta-detected NMR to study near-surface dynamics and lithium ion diffusion in polymer thin films.

Paul Percival is Professor Emeritus in the Department of Chemistry at Simon Fraser University in Burnaby, Canada, and was a research scientist at TRIUMF for 40 years. He has made several pioneering contributions to the field of muonium chemistry- the first detection of muonium in liquids, the first studies of Mu reactivity in the liquid phase, investigation of Mu formation in liquids, including radiolysis effects, in the first observation of muoniated radicals in liquids, in the development of the Level Crossing Resonance technique for the measurement of nuclear hyperfine coupling constants of muoniated radicals and in the observation and characterization of novel free radicals by muon spin spectroscopy. In addition, he has been instrumental in the development of the TRIUMF Centre for Molecular and Materials Science (CMMS).

Preface
1. Perspective and Introductory Remarks
2. Muon Beams and Spin Spectroscopy
3. Formation of Chemical States Incorporating Muons
4. Chemical Reactivity and Dynamics in the Gas Phase
5. Muonium Chemistry and Chemical Kinetics in Condensed Phases
6. Muoniated Free Radicals
7. Spin Relaxation Studies
8. Aspects of Materials Chemistry
9. Soft Matter, Organic Materials and Biological Systems
10. Future Developments and Outlook
Appendix A: Derivation of Muon Polarization Expressions
Appendix B: Muonium Rate Constants for Reactions in Solution
Index