Michel spectrum

The 5 kG magnet sweeps all charged particles away. Only neutral particles can reach the beam stop. The beam stop is viewed by a large Nal(Tl) detector. Observation of positrons with the characteristic energy spectrum (Michel spectrum) indicates the presence of a neutral containing a muon, muonium. 

In detector noise limited spectroscopies such as PAS it is advantageous to enhance the throughput of energy (Jacquinot s advantage) by utilizing a Michel son interferometer. One then Fourier transforms (FTs) the resulting interferogram to yield a PA spectrum that qualitatively resembles an absorption spectrum. 

Enders U, Karch H, Toyka KV, Michels M, Zielasek J, Pette M, Hee-semann J, Hartung HP (1993) The spectrum of immune responses to Campylobacter jejuni and glycoconjugates in Guillain-BaiTe... 

Michel et al. (91) observed that the so-called 5 +4-line spectrum could be observed only in the presence of residual monomers. They irradiated three kinds of samples sample a was obtained by photo-induced bulk polymerization of a monomer which contained considerable amounts of residual monomers. Sample b, containing less monomer, was obtained from the same polymer by dissolving it in acetone and precipitating it as a fine powder in n-heptane. Samples a and b were irradiated at room temperature and the qualitatively similar spectra shown in Fig. 14 were obtained. Sample c (a monomer-free sample),... 

Other explanations have been given for the variation of the relative intensity of the four- and five-line spectrum during radical decay. Michel et al. [92] discovered that a weak broad singlet corresponding to a stable radical and overlapping the nine-line spectrum remains after heat treatment. 

Malinsky, Michelle Duval Kelly, K. Lance Schatz, George C. Van Duyne, Richard P. 2001. Nanosphere lithography Effect of substrate on the localized surface plasmon resonance spectrum of silver nanoparticles. J. Phys. Chem. B 105(12) 2343-2350. 

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The basic component of most Fourier Transform Infrared spectrometers is the Michel son interferometer. This is not the only interferometer used in FT-IR, but it is employed more often than other designs. A treatment of many other interferometer designs is available. The Michel son interferometer in a Fourier Transform Infrared spectrometer replaces the monochromator in a dispersive instrument, although the functions cannot be correlated. A monochomator divides a continuous bandwidth into its component frequencies, whereas an interferometer produces interference patterns of the bandwidth in a precise and regulated manner. It should be noted that this type of interferometer is not restricted to the infrared region and its use can be extended to the visible and millimeter regions of the electromagnetic spectrum. 

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More recently, Michel and co-workers have studied charred modern bone by ESR, IR and x-ray diffraction, and have also studied Middle Pleistocene fossil bone from Lazaret Cave in France (25). They found that the IR feature that they took to be the signature of the organic component of the bone disappears from the spectra of bone that had been heated above about 400 °C. They also found that bone developed a characteristic ESR spectrum upon heating to temperatures between 200 °C and 600 °C, and that this spectrum was replaced by a different, much weaker, spectrum in samples that were heated above 600 °C. 

Fig. 3.17 Mossbauer spectrum of a Fougbrite sample at 78 K (a) compared with the spectrum of a synthetic oxidized green rust sample with the same Fe " molar fraction x (b) Mossbauer spectrum of a green rust related sample from Trebeurden (c) and the spectrum of a similar sample from the Mont Saint Michel (d) (adapted from Ref. [307])...

Fulchiron, R., Verney, V., Michel, A., and Roustant, J.C. (1995) Correlations between relaxation time spectrum and melt spinning behavior of polypropylene. 

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