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TEACHSPIN'S NEW PULSED NMR SPECTROMETER PS2-A TeachSpin will no longer produce our original Pulsed NMR Spectrometer PS1-B because some key electronic components are no longer being manufactured. (Have no fear we have plenty in stock for repair work.) TeachSpin decided to expand the capabilities of our new replacement Pulsed NMR, since the world-wide demand for a teaching PNMR remains robust, and we wanted to respond to requests we have received over the twelve year life of the PS1-A and B. The new design (for which we are finishing the production model) has a host of new and exciting features. First of all, one can study NMR in both hydrogen and fluorine nuclei. The new magnet has a higher field (.49 Tesla and 21 MHz for protons) and a set of electrically controlled gradient coils. The magnetic field is stabilized to at least ±002 gauss over twenty minutes. The electrical shim coil homogenizes the magnetic field so that T2* for a mineral oil sample is 10 milliseconds. The combination of a stabilized and homogonized magnetic field makes it possible to detect inequivalent fluorine nuclei in the FID signal. This spectrometer has phase sensitive detection (with a built in phase shifter) as well as linear amplitude detection. It allows both in-phase and quadrature detection of both pulsed and CW signals. That's right, this unit has a built-in slow magnetic field sweep and lock-in detector for doing CW resonance. This allows the students to compare CW absorption and dispersion with the FFT of the free-induction decay signals. This can be done for both hydrogen and fluorine. The same pulse sequences are available, that is CP and GM sequences, for measuring T1 and T2, in liquids, soft solids, and some hard solids. This unit has a recovery time five times shorter than PS1-A, B, namely ten microseconds. That means students can study many solids whoes T2 is about five microseconds or longer. We have run into some supplier delays but TeachSpin expects to ship the first units by June. Please email or call for pricing. We are delighted that we have found ways to offer the teaching community a new and significantly more powerful and versatile Pulsed NMR Spectrometer for only a small increase in price. For those of you who have used the original unit for many years, we believe you will be delighted with the new instrument capabilities. Your students will be even more excited. Jonathan F. Reichert President TeachSpin Inc. |
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