Round 8: Tossup 1

The sensitivity of this technique is improved by employing CryoProbes with continuous liquid helium streams. (10[1])The DISPEL method is applied during this technique to remove “satellites” shouldering primary signals. Chromium(III) acac (“ay-cack”) is used in this technique as a relaxation agent for more rapid scans. One type of this technique applies 45-, 90-, and 135-degree pulses on the sample (10[1])to induce polarization transfer. (10[1])Through-space interactions are probed by measuring the Overhauser effect in this technique, one form of which (10[1])requires concentrated samples due to the low one percent abundance of a natural isotope. Proton decoupling generates singlet peaks (10[1])with no splitting in this technique’s 13C variant. (-5[1])For 10 points, name this analytical technique that applies a magnetic field on a sample. ■END■ (0[2])

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