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Design of a High-Power NMR Probe for Low-Temperature Studies

✍ Scribed by A.Z Damyanovich; J Peternelj; M.M Pintar

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
71 KB
Volume
144
Category
Article
ISSN
1090-7807

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✦ Synopsis

A low-temperature, high-power NMR probe head design is described which eliminates the problem of electric arc discharge commonly experienced during radiofrequency pulse cycling in a helium environment. A polychlorotrifluoroethylene (Kel-F) coil former, fitted with a solenoid coil, is heat-shrunk onto stainlesssteel flanges and spot-welded inside a stainless-steel probe head assembly connected to a hollow coaxial transmission-line probe shaft. By this means, the sample coil and all high-voltage elements can effectively be isolated in a vacuum, while at the same time permitting good thermal contact between the sample and cryogenic gas. This design was used in NMR studies in the 4.6 K < T < 77 K temperature range for RF pulse durations <50 ms (and longer for low RF amplitudes) and amplitudes up to Ο³60 G.

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