Abstract: In this article, a survey of some new developments and trends in the techniques of electron spin resonance (ESR) in recent ten odd years is described. Since the discovery of ESR in 1944, these techniques have been improving uninterruptedly From the electronic methods, as the use of computers for ESR data acquisition, the replacement of klystrons by solid state sources, the substitution of maser by FET microwave amplifier and other recent advances are briefly discussed.
As a result of the theoretical developments in magnetic resonance, the methods to improve the sensitivity and resolution in ESR are not only by the use of electronics, but also by the application of physical methods. For example, the multiple ESR techniques, the time domain ESR techniques and three-dimentional plot techniques are also reviewed in short.
Finally, the further developments of ESR techniques are expected by the author, and the selected bibliography is given.