UW CHEMISTRY NMR

Announcments & Equipment Logs

May, 2017

AV700 – UPDATE : SYSTEM IS BACK IN OPERATION (WITH CAVEATS)

The BBO – Z gradient probehead is in place, optimized and ready for use.  Please remember that you CANNOT reach below 273 K (0 C) with the current setup.  You can go higher in temperature as before. If you are wondering,  in a nutshell, we had to deal with two solution NMR probe heads that […]

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UPDATE ! AV500 – SYSTEM IS UP AND RUNNING

SYSTEM IS UP ! Thank you for your kind patience during the down time. I shall post a detailed message about VT in a following upload. For the present : The temperature system is working as expected. The noise that people had seen on the baseline, should no longer be there. I will end with […]

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UPDATE – AV500 – SYSTEM WON’T BE READY UNTIL TOMORROW – FRIDAY

I apologize for this discouraging news but the temperature control is not functioning as expected and as I write this, the issue is being addressed actively.  If the problem is deemed to take more time to fix by tomorrow, I will release the instrument for use, after highlighting caveats if any.  Please pay attention to […]

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ALERT ! AV500 – SYSTEM DOWN DUE TO PROBE ISSUES

The broken parts are being fixed and we will try to revive the system as quickly as we can.  The spectrometer should be operational by not later than tomorrow forenoon. NMR Facility Manager 5/17/2017

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ALERT – AV500 : BASELINE NOISE DETECTED

Several users have seen spikes in the baseline of 1H NMR spectra. Unless sample concentration is very low,  the relative intensities of solute peaks are large enough to identify compared to these spikes. So, as of today, users can continue the runs for which they have already booked time. The instrument will be taken down […]

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UPDATE ! AV300 – THE ATMA PROBE IS BACK !

You can now : Type atma or use the Auto Wobb button to tune and match the probehead. Simply type Topshim to automatically shim the sample Please keep us posted if anything worth mentioning turns up. Thank you for your patience while we working on the fix. NMR Facility Manager 5/12/17

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AV300 : ATMA PROBE NOT READY YET….

We still need to fine tune the hardware in ATMA probehead before it is brought to its original spec.  Therefore, currently, the probe still remains as the BBO.  You need to tune/match MANUALLY using WOBB command. You also need to SHIM MANUALLY. I will post a new message, when ATMA Probe is ready for normal […]

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UPDATE – AV300 : ATMA PROBE BEING TESTED

After servicing the ATMA probe head in-house, the unit will be tested in the spectrometer, with the hope that everything turns out well.  In that case, the ATMA probe will be back in service sometime today.  Please look for an updated post on this. NMR Facility Manager 5/11/2017

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UPDATE ON AV700 : EXTENSIVE PROBE ISSUES

We had learnt that the contamination from the dryer/heat exchange system has affected the back up probehead i.e. BBO probehead also.  It is imperative that we identify and fix both the source of such contamination and clean up both the probeheads to their operating specifications.  We are pursuing these twin goals with lot of energy, […]

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ALERT ! AV700 – DOWN UNTIL FURTHER NOTICE

We have found that the extreme chiller system is compromised seriously and it has also contaminated the probehead, making it unsuitable for immediate use.  Until the chiller system is fixed,  we cannot use any other probehead lest that also becomes damaged. I will post a comprehensive update on this once we understand the extent of […]

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