By V. S. Letokhov

Prefaces are typically written while a manuscript is completed. Having entire this publication i will be able to sincerely see many shortcomings in it. but when i started to put off them i might most likely write particularly a distinct e-book in one other years; certainly, this has already occurred as soon as. In 1979, whilst i ended the 1st model of this publication, it was once a lot broader in scope and was once to be titled "Laser Photochemistry." Corrections and additions to that unpublished manuscript gave upward push to the current e-book with its revised name and extra particular material. I resolved to have it released in just this way, even though it matters a dynamically constructing box of study and may quickly make means for different works. This publication comprises the fundamental rules and effects i've been constructing with my colleagues, acquaintances and scholars on the Institute of Spectroscopy, USSR Academy of Sciences, within the city of Troitsk in view that 1970. It bargains with the interplay of sunshine with atoms and molecules through multiple-phonon inter­ motion. Nonlinear procedures within the resonant interplay are used to demonstrate the actual mechanisms concerned and to point how those approaches have ended in smooth purposes corresponding to isotope separation, detection of unmarried atoms and molecules, and chemical and biochemical synthesis.