Factors influencing the intensity

When a double bond is adjacent to the CH3 group, the method fails if measurements are confined to the normal frequencies due to the band-splitting effect, but again, an integrated absorption area value based on all the methyl groups is reasonably good. For 1-butylene, cis- and tra 5-2-butylene and trimethylethylene they obtained values of 1 1.76 1.89 3.50, as compared with 1 2 2 3 for the ratio of the numbers of methyl groups in the molecules. 

The reduction in intensity of CH2 and CH3 groups adjacent to double bonds is apparent from, these values, as is the low relative intensity of the —CH group absorption. 

Quantitative work in the 3000 cm region therefore affords a method for the estimation of the relative numbers of CH3, CH2 and CH groups in hydrocarbons. Hastings et al. [61] have used a somewhat similar method, including also measurements in the 800—700 cm region, for the determination of methyl and methylene groups in paraffin and methylene groups in substituted naphthalenes in complex mixtures. 

This region has many advantages for this type of work, especially as normal optics can be employed and detectors of very high sensitivity are available. 

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The factors influencing the intensity distribution of emission lines are very difficult to determine quantitatively. Although a number of empirical or semi-empirical expressions have been proposed in the literature (7), their numerical evaluation would require knowledge of a number of poorly defined parameters of tlm particular lamp in question. Therefore all of these, types of calculations are based on certain reasonable but somewhat arbitrary assumptions. In Figure 3, the. intensity distribution is shown for the liyperfine emission line at 2.r)37-A., from a cooled electrodeless discharge containing pure 2ll2Hg, with the. intensity... 

It is straightforward that any possible experimental factor influencing the intensity of the signals must be carefully avoided or minimized, while the physicochemical environment of the specimens must be kept as much... 

Most large electrochemical processing faciHties are located where raw materials, including electric power, are readily available at reasonable costs. Other factors influencing the location of electrochemical plants are proximity to markets, estabHshed transportation faciHties, availabiHty of water, and a source of labor. Large electrochemical plants are capital intensive, requiring large capital investment cost per employee. 

In CL measurements many factors that influence the intensity of the CL signal should be taken into account. The CL signal may depend on the geometry of the sample. Internal refraction and reflection at the air-solution interfaces are important factors in determining the measured CL intensity, and should be taken into account, for example, when a CL cocktail is placed over a sample. The effect of sample geometry can be evaluated using model systems, such as enzymes... 

The diurnal variations in mean hourly average oxidant concentration are illustrated in Figures 4-26 and 4-27. Several factors influence the shapes of these curves. The primaiy influence is that of sunlight intensity, inasmuch as photons in the ultraviolet are responsible for the primary photochemical process that leads to ozone formation. Note that the St. 

However, this is not the only factor influencing the emission intensities. In fact, already PUO2 shows a smaller 5 f emission intensity than Np02 (Fig. 26). This can only be explained by different final state multiplet intensity distributions for Np02 and PUO2. This kind of considerations makes a more quantitative analysis of the experimental results difficult. 

Another external factor that, along with temperature, can substantially influence the intensity of tunneling recombination luminescence is an external electric field. The effect of an external electric field on the kinetics of tunneling recombination luminescence is considered theoretically in Chap. 4, Sect. 3. Let us use the equations obtained there to analyze the experimental data available in the literature. 

The factors influencing the conformational stability in open chain molecules have previously been treated extensively in review articles (see for example Ref.6 and 107 ). The aim of the present section is to study torsional potential functions of a series of molecules of principal importance, in particular related to the results of electron-diffraction investigations. The bulk contents of information obtainable from an electron-diffraction intensity curve of a molecule carrying out torsional motion, are not concerned with the torsional motion at all. The part of the intensity curve giving information about the torsion, is distributed over the same range of the intensity curve as where the torsional independent information may be obtained. In the RD-curve the contribution from the torsional dependent part is more clearly separated. To illustrate this and the general influence of torsional motion, three simple molecules with three-fold torsional barriers have been selected (Figs. 3-5)... 

Hyman, A. M. 1977. Factors influencing the psychophysical function for odor intensity. Sensory Processes 1 273-291. 

Another factor influencing the sensitivity corresponds to the length of time of signal integration. Of course, the longer that time is, the more intense is the signal. The data... 

The techniques of quantitative X-ray powder diffractometry have recently been summarized in a book by the same name by Zevin and Kimmel (1995) and more briefly in a review by Stephenson et al. (2001). The technique is based on the assumption that the integrated intensity of a diffraction peak is proportional to the amount of the component (i.e. polymorph) present. Along with other factors that can influence the intensity noted above with regard to the determination of polymorphic identity, that intensity can also be severely affected by absorption of the incident radiation, for which appropriate corrections are available (Klug and Alexander 1974). Relative amounts of different polymorphs are determined by the relative intensities of a small... 

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