the size of the ortho-alkyl substituents parallels changes in other constants derived from the same structural differences, as may be seen from the data in Table IV. Again, only limited comparable data are available.As to the application of the HFA technique to quantitative analysis, it can be concluded that although it is applicable to most phenols, caution should be exercised in systems where there is a bulky ortho substituent or a strong electronegative group at the meta or para position. In such systems, the equilibrium does not lie too far to the right. This, however, can be partially overcome by the presence of a great excess of free HFA. For example, to reach 99% reaction in a substituted phenol whose K with HFA is 100, a 1.0 molar excess of HFA should be present.
The yield curve of the residual Al 25 activity from the Mg u (p,y) reaction was used to locate the lowest two r = f states in Al 25 at £ p =5.864±0.005 MeV, £ a; = 7.916±0.006 MeV and at £ p =5.936±0.005 MeV, E x = 7.985±0.006 MeV. Each of the resonances was narrower than the estimated 3-keV spread in the proton beam, y-ray spectra were measured with a Ge(Li) detector at both resonances. The lower resonance shows strong, approximately equal transitions to the ground state and to the third excited state in Al 25 , as well as a weaker branch to the second excited state. The decay of the upper resonance is predominantly that to the ground state, but weaker branches go to the first and second states. The decay schemes support a f + assignment for the lower r= § state and favor f + for the upper. Rough angular-distribution measurements on the ground-state y ray further support these assignments and indicate that the radiations are close to pure Ml. The various y-ray transition probabilities are well explained by a rotational picture for the low T-% states, y spectra were also taken at the lowest T=f resonance in P 29 , which had previously been located at E x = 8.374±0.005 MeV, and it was found to feed the first, second, and third excited states.
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