Physical line width

Fig. 76. Importance of physical line widths in atomic absorption spectrometry, (a) absorption signal for elemental line (b) spectral bandpass of monochromator (c) emission of hollow cathode lamp.

The absorption profile of the atoms in the atom reservoir is a function of the different line broadening mechanisms and contibutions to the physical line width. 

Figure 29. Imporlance of physical line widths in atomic absorption spectrometry...

The width and shape of the energy loss peaks in HREELS are usually completely determined by the relatively poor instrumental resolution. This means that no information can be obtained from HREELS about such interesting chemical physics questions as vibrational energy transfer, since the influence of the time scale and mechanism of vibrational excitations at surfaces on the lifetimes, and therefore the line widths and shapes, is swamped. (Adsorbates on surfaces have intrinsic vibra-... 

Figure 5.8. The Print Job Page. A user units B paper margins in user units (for axis labels) C physical size of paper (cannot be changed here, cf. (Set up Printer)) D physical size of graph s abscissa in user units (box around graph area, does not include axis labels) E idem for ordinate F select line width.

MeV a-particles and used the Au/Ir source after annealing without any further chemical or physical treatment. Commercially available sources are produced via Pt(p, n) Au. The most popular source matrix into which Au is diffused is platinum metal although it has the disadvantage of being a resonant matrix - natural platinum contains 33.6% of Pt. Using copper and iridium foils as host matrices for the Au parent nuclide, Buym et al. [327] observed natural line widths and reasonable resonance absorption of a few percent at 4.2 K. 

Polymorphism has been identified in the KL-(BEDT-TTF)2Cu(CF3)4(DBCE) system [44]. The primary difference between the kl- and KL -phases is that adjacent BEDT-TTF layers in the KL-phase are tilted in opposite directions, while those in the KL-phase are tilted in the same direction. Also similar to the KL-phases, the trifluoromethyl groups in the kl -phase are disordered. These two phases have similar morphologies and EPR line widths [45] and are thus difficult to distinguish from each other. It is currently not known how prevalent the KL -phase is, although it appears to have similar physical properties to the KL-phase. 

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