The book "Nonlinear resonances in spectra of atoms and molecules", written by a team of authors - Rautian C. G. , Smirnov G. and . and Shalagin A. M. It is a fascinating and in-depth study in atomic and molecular physics. This work will be a real find for students, graduate students, as well as specialists working in the field of physics, chemistry and related sciences. The book examines complex phenomena associated with nonlinear resonances, which play a key role in understanding the spectra of atoms and molecules. The authors take on the task of explaining how nonlinear effects affect the interaction of light with matter, and how these interactions can be used to gain new knowledge about the structure and properties of atoms and molecules. The reader plunges into a world where every interaction of light and matter becomes an opportunity to discover something new and unexpected. One of the main topics of the book is the study of resonant phenomena that can manifest in spectra under certain conditions. The authors describe in detail various methods and approaches that allow the analysis and interpretation of these resonances, which makes the book especially valuable for those who want to deepen their knowledge in this area. Each chapter is imbued with examples and experimental data, which allows the reader not only to assimilate theoretical concepts, but also to see their practical application. The book will be of interest not only to physicists, but also to chemists, since many of the phenomena discussed are directly related to chemical reactions and interactions. Students studying physical chemistry will find in it a lot of useful information that will help them better understand the complex processes occurring at the molecular level. Also, thanks to the accessible style of presentation, the book can be useful for those who are just starting their way in science, but already shows interest in the study of atomic structure. The style of the authors is clear and logical, which makes complex concepts understandable. They use many illustrations and graphs that help to visualize the topics discussed and make the material more visual. This is especially important in such a complex field as physics, where visualization can play a crucial role in the assimilation of information. In addition, the authors actively refer to their previous work and research, which creates a holistic view of the development of this field of science. This allows the reader to see how knowledge has accumulated and how new discoveries affect existing theories. The book “Nonlinear Resonances in the Spectrums of Atoms and Molecules” is not just a textbook, but a real encyclopedia of knowledge that can become the basis for further research and discoveries. It raises important topics such as the interaction of light and matter, nonlinear effects, and their role in modern scientific research. This work will surely attract the attention of those who seek a deep understanding of physics and chemistry at the molecular level. If you are looking for a book that combines theory and practice, in-depth research and an accessible style of presentation, then “Nonlinear resonances in the spectra of atoms and molecules” will be an excellent choice. This work will not only expand your knowledge, but also inspire new discoveries in the world of science.