Field-molecule synchronization

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]. 

Finally, we note that a number of experiments have shown that it is possible to. accelerate or decelerate molecules using time-varying electric fields [244], In this case the molecule is passed through an array of synchronously pulsed electric field stages that interact with the molecular dipole. Since the dipole is a function of the "J state of the system, it may be possible to prepare a superposition of internal states and then selectively accelerate one of the two internal states to produce the desired J superposition.. 1... 

The field of molecular nonlinear optics has been growing since the first prediction of the nonlinear optical process, and a strong boost was given to the field with the experimental observation of nonlinear optical effects made by Franken et al. in 1961 [29]. The development of the modern laser had provided scientists with a source of the high-intensity fields needed for nonlinear optical processes to become effective. However, one could not observe a synchronous development in the quantum mechanical modeling of these processes, and there are several reasons for this delay. The molecules of experimental interest are in most cases large, and, 1... 

In an alternating field the orientation of a polarization varies cyclically with the field. At low frequency, all types of polarization synchronize their orientation with the field, but as the frequency increases, the inertia of molecules causes certain modes of polarization to lag behind the field. In RE and microwave frequencies, electron and atomic polarization are much faster than the time... 

Central to the understanding of the operation principle of a Stark decelerator are the concepts of a synchronous molecule and of phase stability. Returning to Figure 14.6, we call the position z of a molecule at the time when the fields are switched the... 

Temperature phase synchronism is obtained in optical second-harmonic generation in a ferroelectric smectic C whose helicoid is untwisted by a constant electric field. The nonlinear second-harmonic susceptibility due to spontaneous polar ordering of the molecules is estimated. 

The usual method of obtaining phase-synchronous SHG in a nematic phase and in a smectic- 4 is to change the angle between the pump wave vector and the LC optical axis by rotating the cell around the direction of the dc electric field [3]. To obtain phase synchronism in this case we varied the temperature to change the inclination of the molecules in... 

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