Emission spectra for

Schematic representation of an apparatus that measures the emission spectrum of a gaseous element. Emission lines appear bright against a dark background. The spectmm shown is the emission spectrum for hydrogen atoms.

The emission spectrum of the PEG-2N2 complex consisted of a large contribution from a collective excitation due to the interaction of two neighboring naphthyls and a small contribution from isolated (monomeric) naphthyls (see Fig. 12). This differs from the emission spectrum for the a-CD-PEG-2N2,... 

An emission spectrum for pure mercury obtained from a mercury lamp. It is easy to see that mixed sources, and higher energy excitation will produce very complex patterns of lines, demanding high quality optical... 

Qualitative analysis may be made by searching the emission spectrum for characteristic elemental lines. With modem high resolution optics and computer control, the emission spectrum may be readily examined for the characteristic lines of a wide range of elements (Figure 8.13). Quantitative measurements are made on the basis of line intensities which are related to the various factors expressed in equation (8.1). Under constant excitation... 

The emission spectrum for mercury shows that it has more spectral lines than the emission spectrum for hydrogen. 

Yellow autofluorescence of lignin in UV-light (40,41) has also been used as a criterion (28,30,31). However, in view of the countless autofluorescent substances in plants (40,42), even the recording of a typical emission spectrum for lignin (31) cannot be regarded as a specific proof for the presence of lignin. 

Fig. 4.7. Field emission spectra of W(112) and W(IOO). Dotted curve theoretical field emission spectrum for free electron metals. Dashed curve experimental field emission spectrum for W(112). Solid curve experimental field emission spectrum for W(IOO), A substantial deviation from the free electron metal behavior is observed. The deviation, so-called Swanson hump, is due to the dominating role of localized surface states near the Fermi level at W(IOO) surface in field emission. (After Swanson and Grouser, 1967).

Shown in Figure 5 is the emission spectrum for LaOBr.002Tb (23). At these terbium concentrations, the principal emissions occur at 380, 415 and 440 nm which can be used with blue sensitive films. This phosphor is being used in Agfa-Gevaert Co. 

Figure 6 shows the emission spectrum for Cd20 2S.005Tb. 

Shown in Figure 7 is the emission spectrum for BaFCI.05Eu. The divalent europium emission is a broad band peaking at about 380 nm. This phosphor is used in DuPont Co. Quanta II blue screens and is useful with blue film only. 

Figure 2 X-ray emission spectrum for "(Bi,Pb)2Sr2Ca2CusO10" showing overlap of Pb and B L lines...

One of the main values of fluorescence as a technique for probing protein conformation is that it is highly sensitive and very economical of material. This means, however, that small traces of fluorescent impurities in the solvent or on the cell are readily detected and, if care is not taken, can lead to misinterpretation of the spectra. The essential aim in using this technique, therefore, must be to obtain a fluorescence emission spectrum for a protein that is guaranteed free from all too easily generated artifacts. 

Under our experimental conditions, multifrequency data are collected at six equally spaced emission wavelengths spanning the entire emission spectrum. For this particular case, the time-dependent emission center of gravity is then given by (27) ... 

Figure 6. Fluorescence emission spectrum for polyamide on plastic facing oxidizing linoleic acid. Conditions 69 °C for 20 h.

Figure 3. Variation in the Eu emission spectrum for [Eu.2c] (pH 7.4, 0.1M MOPS) following incremental addition of sodium hydrogencarbonate spectra in the insets show formation of isoemissive points at 588 and 702 nm.

Figure 14.6 shows the measured low resolution emission spectrum for two excitation wavelengths together with the results of two calculations. Here, low resolution means that the intensities for different final states with the same total number N of OH stretching quanta, e.g., 20+) and 11+), are summed. The smooth fall-off indicates the increase of the... 

Figure 30 Emission spectrum for the same diode as on Fig. 29 at high (solid line) and low (dotted line) currents. Emission intensities in arbitrary unit.

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