Dear all
We have two identical JEOL 400 ECZS instruments and operate both in Walk up
mode nearly all the time. We ended up with two identical NMRs, mostly by
planning. We could have left one untouched and spend loads on the second, but
the old magnet would sit, boiling off helium and not being used.
Walkup has a 15 minute automatic delay up to 6 pm, which means carbons are
nearly all delayed, although users are taught how to creep under the limit =
if their sample is concentrated. Using the signal/ noise check is encouraged
for 13C spectra. They are warned not to only use a combined 1H, 13C, COSY,
HSQC..... experiments if a quick proton is needed; the latter can be submitted
in addition.
Once users are a bit more experienced, they can be taught 1D NOESYs and 1D
TOCYSs etc
Booking slots is hardly every needed , unless a kinetics run is wanted or there
is no way round doing a very long carbon.
I charge by the hour instead of per experiment, to encourage people to use
every experiment available. The main costs are service contracts, space costs
and cryogens so I like it to be used 24/7.
Regards
Rob Lewis
Dr Rob Lewis PhD BSc MRSC
Chemistry
University of Hull
Cottingham Road,
Hull
HU6 7RX
UK
T. +44(0)1482 466649
Email: R.A.Lewis_at_hull.ac.uk
Dear all,
One thing that is clear from the responses thus far is that there is no general
solution, it depends on demand (a, if not the, dominant factor), the type of
work being conducted, and the mentality and attitude of users, as well as
ultimately simply personal preference. I have worked at various places with
various policies in place, some places were more successful than others in
terms of efficient use of the instruments, limiting access abuse, and minimizing
arguments amongst users. With changes in instrumentation, users, etc. etc.
matters could improve and, naturally of course, deteriorate. The best system
I worked under, and admittedly this may simply have been down to the limited
demand, was a hybrid system where booking was not necessary but an online
booking system was in place and users were free to book the instrument as
necessitated, even for long runs during business hours. Users were simply
instructed to be considerate of others and to use their common sense, e.g.,
if demand was high, leave or schedule long runs for out-of-hours, but
otherwise by all means put on long runs during business hours if the
instrument was idle. The good thing about a booking system is that users
could see if the instrument was available before heading over to the NMR
unit (and of course email notifications serve the same purpose but a booking
system seems much more robust to my mind), but, and this is the crucial point,
if a user had booked a sizeable block they were encouraged to indicate if
interrupts were or were not possible for others to run some quick spectra.
Interrupts were not only possible if a user was doing a large number of
shortish runs, but also for long runs such as carbons or 2Ds. Topspin allows
one to halt a spectrum and then continue on with it, for 1D spectra adding
to the already accumulated scans and for 2D, picking up where you left off.
It works superbly for carbon I have to say. I even had a simple a macro that
users could use to halt a long run (halt the run, save the shim file, eject
the sample, etc.) and then when they had finished their short runs, simply
re-insert the interrupted sample, make sure they were in the right directory
(helps to leave a note), then lock onto to right solvent and enter another
macro to get things going again (read the saved shim file, tune, shim, start
the accumulation, etc.). The system worked great and it is just a pity that
icon cannot do such things and so for interrupts to be an option, the spectra
have to be acquired manually, thus more work not only for the user of the
long run, but also for others and also more training is required.
Kind regards,
Karel Klika
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Received on Sat Oct 07 2023 - 12:28:56 MST