Long-pulsed, definition

The existence of a withdrawal syndrome was subjected to a controlled test (122) in seven patients who had been taking long-term amitriptyline up to 250 mg/day, imipramine 200 mg/day, or desipramine 250 mg/day. After 4 weeks placebo was substituted double-blind for 10-21 days. Both plasma and urine MHPG concentrations increased by an average of 74% above baseline, starting within 36 hours and reaching a peak 3 weeks after withdrawal. Despite these pronounced neurochemical changes there were no alterations in pulse rate or heart beat, and only two patients had definitely worse anxiety. 

It is worthwhile to note that the field-molecule synchronizafion can be achieved by tuning the laser frequency and adjusfing its intensity. This means that a quantitative knowledge of 5 is not necessary. In particular, a two-pulse (UV + IR) scheme can be proposed with a given time delay. If an intense ultrashort UV pulse is turned on at a definite time to after the onset of the long IR pulse, it will instantaneously prepare well-aligned ions from H2 in its ground state. A variation of the frequency of fhe IR laser pulse would then allow the desired synchronization to occur [12]. 

Pseudorandom noise A noise signal that satisfies one or more of the standard tests for statistical randomness. Although it seems to lack any definite pattern, there is a sequence of pulses that repeats after a long time interval. 

In Chap. 3, wave packet propagation could be observed for nearly all of the alkali dimer and trimer systems considered, over a rather long time compared to the wave packet oscillation period. The wave packet dynamics - a fingerprint of the excited molecule - definitely characterize the excited bound electronic state of these molecules. However, with the results on K3 (excited with A 800 nm), another phenomenon, which often governs ultrafast molecular and cluster dynamics, comes into the discussion photodissociation induced by the absorption of single photons. This photoinduced dissociation permits detailed study of molecular dynamics such as breaking of bonds, internal energy transfer, and radiationless transitions. The availability of laser sources with pulses of a few tens of femtoseconds today opens a direct, i.e. real-time, view on this phenomenon. 

The factor 2 has been introduced to account for differences in the definition of the rate of termination. In the analysis of the MWD results, termination was assumed to be exclusively by combination and, hence, 5 = 0 [49, 50]. Recall that equation 4.22 is a long chain approximation and assumes the absence of chain transfer events [51]. The rate of polymerization was determined from the gravimetric analyses of the conversion and the total time duration of the pulse experiment. The results of this number average molecular weight are shown in figure 4.7 for MA, EA and BA. To understand what can be concluded from this graph, let us first focus on the results for the monomer BA. It is clear from this figure that the data points for BA have been subdivided... 

Judeinstein et al have conducted direct measurement of through-space NMR interactions that provide definitive evidence for spatial proximity of different species. Dipole-dipole interactions can be measured in principle between any NMR active nuclei with heteronuclear correlation experiments in the liquid or solid state." The dipole-dipole interactions decay quickly with the internuclear distances (r ), and are difficult to evaluate for long-range distances and even more difficult when exchange, conformation, or motion phenomena are present. However, the measurement of the nuclear Overhauser method" based on the dipole-dipole-induced crossrelaxation, was proposed to successfully measure intermolecular interactions" and the formation of ion pairs." " In agreement with recent studies, the pulsed field gradient enhanced inverse HOESY (heteronuclear Overhauser enhancement spectroscopy) sequence is usually preferred because it is more sensitive for isotope pairs H- Li and also improves the digital resolution in the H crowded spectrum." ... 

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