High field condition

Distinct quadrupole shifts do occur as well in magnetically split spectra of single-crystals, poly crystalline powder or frozen solution samples. In all three cases, the line shifts obey the simple first-order expression at high-field condition. 

Linden, H.B. Beckey, H.D. Okuyama, F. On the Mechanism of Cathodic Growth of Tungsten Needles by Decomposition of Hexacarbonyltungsten Under High-Field Conditions. Appl. Phys. 1980,22, 83-87. 

This approximation is equivalent to those employed in references 36 and 39 for continuous-wave experiments. It is valid when both the high-temperature and high-field conditions are fulfilled. (98, 99) Kaplan s claims to the contrary (references 100 and 101) seem to be unjustified. (98,99,102)... 

Fig. 14. Mobility versus E/N, showing the change of the mobility coefficient K as the ions are clustered through the addition of a dopant (e.g., methylene chloride). Under high-field conditions, K stays practically unaltered, whereas under low-field conditions, K is decreased, which leads to an increase in A K.

Chazalviel et proposed a model that differs from Lehmann s only in the cause of the phase transformation. Their model is based on a defective nature of the oxide and the change of oxide property is considaed to be due to a sudden loss in the ion and electron blocking properties of the oxide. Breakdown of oxide occurs at the high field condition resulting in a large electronic current or ionic current. 

In order to measure of equation (11b) frequency or field dependent for frequencies greater than 5 MHz, where the standard technique no longer works, Bq must be varied over the relaxation period the generation and detection of the local spin order can be achieved under any suitable high-field condition. We realized this possibility with two of our FC spectrometers by a Bq cycle with a fast field switch Bpi from the polarization to the relaxation field at the beginning of the relaxation period (t2 interval), and the inverse switch Bp from the relaxation to the detection field Bp = Bp at the end of the T2 interval. The extended Jeener sequence... 

Deviations from 1st order spectra occur when the high field condition D< hv does not strictly apply ... 

The high field condition with the electron Zeeman energy gf sB hfc does not apply. 

If we count the number of valence electrons in a primitive cell, most of the lanthanide compounds are even in number, meaning that they are compensated metals. In this case the transverse magnetoresistance increases as /f" (I 2) for a general direction of the field. Note that the integer n is not equal to 2 because the high-field condition is not fully satisfied in the real compounds. When the magnetoresistance saturates for a particular field direction, often a symmetrical direction, there exist some open orbits whose directions are parallel to JxH, namely a=Ji/2 in -space. 

For the MRI agents listed in Table 2 the values of D/gP are well within 100 mT. Therefore, the -1/2 o 1/2 EPR transition can be readily used for ENDOR measurements of these complexes at the. Bo > 3 T, which corresponds to the operational mw frequencies Vmw > 84 GHz (W-band). The analysis of the ENDOR spectra at such high-field conditions can be performed without taking account of the cfi. However, for most of the MRI agents even the Ka band (Bo 1 T, Dlg B < 0.1) pulsed ENDOR works reasonably well, although in this case it is better if the cfi corrections are taken explicitly into account in the numerical simulations. The... 

For the anodic growth of films under high-field conditions in an electrolyte such as purified boric acid ( 0 logarithmic kinetics common to those for dry oxidation in the temperature range below 300°C are observed. At temperatures between 300 " and 425 "C thermal oxidation of aluminum obeys classic parabolic-diffusion-controlled kinetics ... 

---