News:

NMR Sessions (11/06/08)
We are beginning to offer NMR sessions that cover different aspects of NMR. The first sessions are scheduled over the next two weeks. Please RSVP for the sessions so we know how many people to expect.
MNova 1D Basics will be an extended demo of the display and reporting capabilities of MNova. We will cover the interface, zooms and cuts, phasing, baseline correction, peak picking, integration, multiplet analysis and reporting, chemical structures and assignment, and exporting data to other applications.
MNova Advanced 1D Processing will cover truncation, time-domain signal suppression, linear prediction, window functions and resolution booster. We will also look at using and creating arrayed/stacked spectral displays.

In the future we are planning to offer sessions on 2D NMR, GC-MS and if there is interest, basics of NMR hardware. Let us know if there is anything else you would like to see us cover.

ASW probe in 400 (02/28/08)
We put the ASW probe back into the 400. This should make some of you happy, and some of you sad, as versatility is gained at the expense of 1H sensitivity. Please let us know, where your preferences lie.
In the meantime:

• 1H sensitivity is decent but ~50% of HCX.
• 13C is available and sensitivity is good.
• 31P is available, sensitivity is just OK. Remember to change the 1/4 wavelength cable. No other changes required.
• 19F is available, no cable changes required.
• Other nuclei are available with staff assistance.
• Ask us before doing VT.

HCX probe in 400 (03/20/07)
The inner insert of the 400 workhorse ASW probe is broken again and the probe is going out to be repaired.
We have installed the HCX probe in the 400 which means that:

• 1H sensitivity is excellent (better than the 500)
• 13C is available but sensitivity is abysmal. Use the 300 or the 500 instead.
• 31P is available but requires cable changes and sensitivity is poor. Use the 300 or the 500 instead.
• 19F is not available

Scheduler passwords reset (02/08/07)
The scheduler passwords have been reset. The new passwords were sent to the nmr e-mail list (chemnmr-l). If you did not get the new password, contact the facility staff. Please change your password as soon as possible:

• Log in with your temporary password
• click the "user profile" link in the footer
• Click the "Change password" link
• Enter the requested infromation
• Click the "Log out" link in the footer

GC-MS down until Friday (12/9) (12/06/05)
We are moving the GC-MS to a different location in B-22 to make room for a new instrument which will be arriving shortly. During this time the instrument will not be available. We expect that the GC-MS will be back in service by Friday (12/9).

DBG back in 500 (12/06/05)
The DBG probe has been repaired and is now back in the 500. VT limits of the DBG are -80 to +150 C. Please remeber to load the correct shimmap if you used the LNC probe.

500 DBG broken, replacement limited to +100C! (11/10/05)
I am sorry to report that the VT dewar inside the 500 workhorse DBG probe broke last night which puts the probe out of service until further notice. While we are working on getting the DBG repaired, the newly acquired LNC probe will be installed in the 500.

Please note: This probe is limited to +100C! Do NOT heat the probe above +100C or you will damage the gradient and RF coils.

The LNC is a 13C/15N detect 1H/19F decouple probe, which means that:

• 1H sensitivity is OK, but the 600 is 2.5 times better. Please, don’t tune the 1H channel. It's tricky and unneccessary.
• 13C S/N is best available. You may tune the 13C channel using the red tuning rod. The top portion of the rod is tune and the bottom portion is match.
• 15N is available only with staff assistance.
• 19F is available only with staff assistance.
• P31 and other nuclei are not available.
• VT range is –120°C to +100°C.

You must use load the correct gradient shimmap (LNC_LOAD_ME) or gradient shimming will just make things worse. See corkboard for instructions. If something goes wrong with shimming, retrieve the default shim values by typing: rts('LNC_LOAD_ME') su
If you have any questions or run into problems with the probe, please let us know.

ARX training Wed 07/27 and Thu 07/28 (07/21/05)
You can sign up for the training here.
The ARX is our oldest instrument and sees limited use. 1H sensitivity is 50% of the Mercury's, but 13C sensitivity is comparable. Samples have to be shimmed manually and should contain 0.5 ml solvent or more. You can find more information on this spectrometer here.
Feel free to contact Ivan if you have any questions about the instrument or the training sessions.

Proposed changes to low field sign-up rules (07/21/05)
The demand for low field NMR time during peak hours increased considerably over the last few weeks. In order to allow more people access during those hours we are planning to institute the following changes to the sign-up rules starting MONDAY 07/25:

• Mercury 300:
  • Time slots limited to 15 minutes during peak hours (8 am to 8 pm)
  • No more than 30 minutes total per user per day
• INOVA 400:
  • Time slots limited to 30 minutes during peak hours (8 am to 8 pm)
  • No more than 60 minutes total per user per day
• INOVA 500:
  • No change for now. We want to keep scheduling on the 500 as flexible as possible.

No staff 07/22, maintenance times available for use (07/21/05)
Tony and Ivan will be out of town Friday, 07/22 to demo a high-resolution GC-MS instrument. If you need to reach us during this time, please call 255 0709.
This week only, we will be filling nitrogen on Thursday instead of the usual Friday morning times. Feel free to reserve the instruments for Friday morning.

600 magnet quenched! (06/26/05)
I am extremely disappointed to report that the 600 magnet quenched early Sunday morning. I will get Varian to re-energize the magnet as soon as possible, but the instrument will not be available for at least two months. In the meantime:
THE 600 IS OUT OF SERVICE UNTIL FURTHER NOTICE!
If you have any questions or concerns, please do not hesitate to contact us.
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