High intensity radio frequency

The cw-NMR is orthodox and sufficiently reliable if the signal-to-noise ratio of the spectrum is high enough to estimate its baseline precisely. In the pulse NMR case, on the other hand, since the short-time behaviour immediately after the intense radio-frequency (rf) pulse irradiation is important, as expected from (6.2), recovery time or dead time of the experimental equipment after the pulse, causes a serious limitation of reliability for the estimated moments. To overcome this weak point the improvements in technique, the magic echo sequence [26-29] and in analysis, the functional forms of fitting [30-32] were applied to recover the FID signal at r = 0. Details are described in [2]. 

A high-intensity, electrodeless ultraviolet source has recently been introduced. This UV source is distinguished from other conunercially available UV lamps by the fact that no electrodes are Inside the lamp. Electrical energy is supplied in the form of radio frequency power that is coupled into an evacuated quartz tube containing mercury and other additives. As compared to conventional medium-pressure mercury arcs with electrodes, the electrodeless system has several attributes that make it unique (17). These are summarized as follows (1) instant on-off (2) modular lamp design (3) increased lamp lifetime (4) variable spectrum (5) excellent energy conversion. 

---