Electron spin resonance system components

Many electron spin resonance (ESR) studies of different systems have shown that phase separation in lipid layers may lead to a domain-like lateral structure. The area of domain formation can be extended over several hundred A. In this connection the charge-induced domain formation in biomembranes is of special interest for the medicinal chemist. Especially the addition of Ca to negatively charged lipids leads to domain formation. Each lipid component is expected to have a characteristic spontaneous curvature. The Ca - induced domains lead to protrusions in the membrane plane. The lateral variation in the concentration in the plane of the membrane would then lead to a parallel variation in... 

Line-width effects in electron spin resonance spectra have been the subject of three recent reviews " and so there seems little point in further detailed repetition of the principles at this time. Basically, line-width effects will be observed when the Hamiltonian describing the spin systems contains time-dependent elements having frequency components comparable to frequency separations in the spectrum. The mechanisms... 

The first stage was the production of a pulsed free-jet molecular beam of helium containing 20% CO, which was then crossed with an electron beam to produce ionisation. The ions were produced close enough to the beam nozzle for cooling to occur downstream. Some 4 cm from the nozzle the beam entered a confocal Fabry-Perot cavity where it was exposed to millimetre wave radiation close to 120 GHz in frequency. Following microwave excitation, when on resonance, the beam was probed with a Nd YAG pumped dye laser beam with the frequency chosen to drive rovibronic components of the A 2 U-X 2 + band system. Figure 11.54 shows two recordings of a spin component of the lowest rotational transition the line shown in (a) is... 

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