Round 5: Tossup 1

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

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