Question
In this technique, different sequences of pulses of 90 and 180 degrees lead to an “inverted echo” or a “stimulated echo.” For 10 points each:
[10h] Name this technique that irradiates the sample in both microwave and radiofrequency applied fields. This technique has a “continuous wave” version, as well as pulsed methods developed by Davies and Mims.
ANSWER: ENDOR [or electron nuclear double resonance; accept pulsed ENDOR or continuous wave ENDOR or CW-ENDOR; prompt on EPR or ESR; prompt on EPR-detected NMR; prompt on, but DO NOT REVEAL, electron paramagnetic resonance or electron spin resonance]
[10e] ENDOR is used to resolve hyperfine couplings in EPR spectroscopy, which studies these species. Single-headed arrows are used to depict reaction mechanisms with these species.
ANSWER: radicals [accept unpaired electron systems; accept paramagnetic; accept electron paramagnetic resonance]
[10m] Both Davies and Mims ENDOR use a 180-degree pulse in this period of the experiment. In 2D NMR, this period comes between the evolution and detection steps.
ANSWER: mixing period [or mixing time]
<KP, Chemistry>
Summary
| 2024 Chicago Open | 07/28/2024 | Y | 15 | 11.33 | 100% | 0% | 13% |
Data
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