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NMR Facility News05/23/12 It appears we are having a run of bad luck! The default probe of Ytterbium (700 MHz) has
now developed problems and needs to be repaired. In the interim we have installed the secondary probe, HCN. This probe
has much better sensitivity for proton, but can only do H1, C13 and N15 1D and 2D experiments.
Any other nucleus has to be done either in Gallium or
Tellurium. The sensitivity for C13 is about half of what is was before and about the same as in Gallium. Tuning proton is done with the software. Tuning of C13 or N15 for routine samples shouldn't be necessary, but can be done manually
for maxiumum sensitivity with dilute samples. Ask us for instructions if you need to do this.
05/04/12 The default probe of Tellurium has been removed and shipped for repairs. The HFX probe has been installed. This probe has similar sensitivities for H1 and F19 to those of the default probe. However, any other nuclei, like C13 or B11, have lower sensitivity (a bit less than in Gallium). Variable temperature is possible. 04/09/12 The default probe of Tellurium has developed a problem that prevents it from reading the correct temperature. Variable temperature operation is not possible until we resolve the problem; only room temperature is available. 03/06/12 Cobalt has developed a problem in the low frequency channel. Fluorine and proton spectra, including two-dimensional homonuclear spectra like noesy and cosy are fine. 1D carbon and phosphorus spectra should also be ok, but heteronuclear 2D experiments like HMQC, HSQC or HMBC won't work correctly. We are currently troubleshooting the problem. Instrument Status
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| E. Alvarado. 12/07/10 |