Signal dispersion

DOS and, concomitantly, on p [63-66], and, (iv) the temporal features of TOF signals, notably the universality of non-dispersive signals at variable sample length and electric field, and the transition to dispersive transport which, remarkably, does not bear out universality [67]. 

For several technical reasons, it is not possible to acquire NMR data with perfect phase. One reason is the inability to detect XY magnetisation correctly another is the fact that we are unable to collect the data as soon as the spins are excited. These limitations mean that we have to phase correct our spectrum so that we end up with a pure absorption spectrum. What we don t want is a dispersion signal (see Spectrum 4.2). 

Spectrum 4.2 An absorption signal (below) and dispersion signal (above). 

Dominance-related, in mice, rats, monkeys Maintenance or formation of social group Social cohesion and dispersion Signals (display, sounds, odor) between group members of different social rank, low-level/intensity of aggression... 

What remains therefore is to find a way of deriving F fj(t) from the observed signal Fm(t). This can be done by recording, in addition to the time-dependent non-dispersed fluorescence, the dispersed signal. The dispersed... 

Dispersion signal in the frequency domain Discrete Fourier transform Dimyristoylphosphatidylcholine... 

The time-gated (frequency-dispersed) signals are obtained by integrating the spectrogram over frequency (time), i.e. 

S(co) is called a complex Lorentz line. Its real and imaginary parts, A(co) and D (o), denote the absorption signal and the dispersion signal, respectively (Fig. 2.2.6) ... 

The real part of this function is proportional to the absorption signal A((o), and the imaginary part to the dispersion signal D(ca) defined in (2.2.26) (cf. Fig. 2.2.6). The absorption signal is a resonance line with a full width at half height of = 2/72. The shorter the Ti, the faster the time-domain signal /(r) decays to zero and the wider the resonance line F(w) becomes. 

Figure 23. Comparison of ESR signals from a single crystal of synthetic diamond in the TEioi cavity and in the loop-gap resonator. Spectra were obtained at room temperature with 2G field modulation. Spectrometer gains are indicated. A, Absorption signal, 1 mW, 9.3 GHz, 1 second time constant. B, Absorption signal, 2 pW, 8.8 GHz, 0.25 second time constant. C, Dispersion signal, other conditions same as in B. D, Dispersion signal, 1 mW, 8.8 GHz, 0.25 second time constant. From [53], with permission.

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