Re: [AMMRL] Lineshape anomaly

From: Spin-Doc <bert.heise_at_spin-doc.net>
Date: Thu, 16 Jul 2026 09:33:29 +0200
Hi Scott,

the contact surface to the spinner in Bruker systems is at the top of the shim tube -
did you already try to clean that (remove the probe & unscrew the three ling screws
atop the upper part, unscrew the four screws on its magnet mounting flange). FYI, that
surface in Varian machines is at the bottom of the “upper barrel= ” and atop the probe in Jeol machines ;-)

Have you tried to exclude other sources of line broadening yet like PFG (just disconnect the
PFG connector from the probe and re-run the spectrum/check lock)?

Cheers
Bert

-> Sent via mobile <-

Spin-Doc 
Magnetic resonance equipment, service, training & more
Dr. rer. nat. Bert Heise
Owner, applications scientist
Kiefernweg 13
58239 Schwerte
Germany
Mail: bert.heise_at_spin-doc.net
Phone: +49-171-5135315

Representing MestreLab software, Stelar relaxometers & Barthel HF amplifiers



Am 15.07.2026 um 21:13 schrieb Todd Rappe via groups.io <rapp0006=umn.edu_at_groups.io>:

I would try cleaning the bore/transfer tube. My guess is there is some gunk built up in there that is intermittently obstructing the sample from fully inserting, but still getting far enough to trigger the sample down sensor and be able to lock.

_____________________________________
Todd Rappe
Minnesota NMR Center <nmr.umn.edu>
612-625-9147 (office)
651-321-TODD (rings office and mobile)
612-624-8892 (magnet lab)

                                  


_._,_._,_
Groups.io Links:

You receive all messages sent to this group.

View/Reply Onl= ine (#3577) | Reply to Group | Reply to Sen= der | Mute This Topic | New Topic
Your Subscription | Contact Group Owner |

_._,_._,_
Received on Thu Jul 16 2026 - 04:24:53 MST

This archive was generated by hypermail 2.4.0 : Sat Aug 01 2026 - 17:50:19 MST