Hi Tara,
if you use a regular turbine with an ST probe, you will position the sample a good amount too high, as the ‘shark fin’ positioning feature on top of the ST probes will prevent the standard turbine to completely settle down. Long samples (2” fill height) can be ‘almost’ shimmed to some barely reasonable level, but will push various high-order shims by a lot and will never be really good.
Shorter samples are unlikely to work to any satisfactory level.
The reverse will work better, but unfortunately, the 3mm ST turbines (those designed for 2 samples side-by-side) are dangerous for other reasons: they offset the sample too much. 3+3mm would require space for a 6mm sample, which the RT probes don’t have, and you will risk breaking the insert. If you happen to have 2x 2.5mm turbines (the later generations), you will be fine, just some of the lower order transverse shims may need a bit of correction due to the offset.
But if you happen to have a turbine designed for only one 3mm sample tube, with the relief cut for the ’shark fin’ but only one central bore for the sample tube, you will be fine. Those turbines work without any issue in standard RT or cold probes.
Best regards,
- Knut
> On Aug 7, 2015, at 8:00 AM, Tara Sprules <tara.sprules_at_mcgill.ca> wrote:
>
> Hello,
>
> I appear to have packed up my 3mm sample turbine in the 'storage' boxes during the big lab move/shutdown we just went through.
>
> I have a user who wants to use 3mm tubes in our 500 RT probe.
>
> On spinsights I see the 3mm sample turbine for salt tolerant probes... I assume this would sit in the correct place in an RT probe? We were doing the reverse, carefully positioning a tube in a regular 3mm turbine to use in an ST cold probe previously.
>
> Or, if the ST probe turbine isn't compatible with a regular RT probe, does anyone have a spare 3mm sample turbine they could sell or lend us?
>
> Thanks very much,
>
> Tara
>
>
>
> *********************************************
> Dr. Tara Sprules
> Quebec/Eastern Canada High Field NMR Facility
>
> www.nmrlab.mcgill.ca
>
> phone: (514) 398-1721
> fax: (514) 398-8254
>
> 3420 University St., Rm 023
> McGill University
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>
Received on Fri Aug 07 2015 - 10:18:52 MST