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- This experiment is about the use of electron spin resonance to work out the characteristics of a passive oscillator circuit and a DPPH sample. This is a method designed to find out about chemical compounds that has one or more unpaired electrons. When placing the sample in a magnetic field its free electrons will aline itself either parallel or anti-parallel to the magnetic field. By electromagnetic waves at these electrons one can hope to switch these from a negative spin to a positive spin. Through this method one can determine the so called g-factor of the compound (describes how close the unpaired electron behaves as a free electron ). Through doing this experiment we determined the g-factor of the DPPH sample as 1.85±0.06. This is a bit off the actual value of 2.0036, but taken into account other errors and uncertainties encountered one can say that this is a good result.
- This experiment uses electron spin resonance (ESR) to determine the characteristics of a passive oscillator circuit and a DPPH sample. This method is designed to investigate chemical compounds that have one or more unpaired electrons. When placing the sample in a magnetic field, its free electrons will align themselves either parallel or anti- parallel to the magnetic field. By firing electromagnetic waves at these electrons they can be switched from a negative spin state to a positive spin state. The g-factor of the compound (which describes how closely the unpaired electron’s behaviour resembles a free electron) can be determined through this method. In this experiment the g-factor of the DPPH sample was determined as 1.85±0.06. This is slightly lower than the actual value of 2.0036, but taking into account other errors and uncertainties encountered, it can be considered a valid result.