Nuclear Magnetic Resonance Laboratory

A new 600 MHz NMR spectrometer provides a full range of chemical analysis, structural studies, and physicochemical measurements based on an extraordinary combination of instrumentation and accessories.  A dedicated laboratory provides all the necessary infrastructure.  Major features of the spectrometer are summarized below:

600 MHz 5 mm QNP Cryogenic Probe:

• enables multipurpose NMR measurements for ¹H, ¹³C, ³¹P, and ¹⁵N
• the cryogenically cooled probe is three to four times more sensitive than conventional probes, which allows for the measurement of lower concentrations, or for greatly shortened experiment times (it's as much as 16 times faster than a conventional probe)
• automatic routines for shimming, tuning and matching
• sample temperature is controllable from 0 °C to 80 °C
• ¹H sensitivity is >2600:1

600 MHz 5 mm BBFO Probe:

• enables multipurpose NMR measurements for ¹H, ¹⁹F, or any nucleus in the range from ³¹P to ¹⁵N
• automatic routines for shimming, tuning and matching
• sample temperature is controllable from -150 °C to +150 °C
• ¹H sensitivity is >850:1 

A ¹³C spectrum of Jet A kerosene in CDCl₃ (inverse gated
decoupling, 1.5% Cr(acac)3, 4120 scans).

600 MHz 4 mm HX CP-MAS (solids) Probe:

• the broadband channel is tunable from ³¹P to ¹⁵N
• 15 kHz maximum spinning speed
• ¹³C linewidth: 4.6 Hz (adamantane)
• ³¹P sensitivity: S/N = 3221 (ammonium diphospate, 2 scans)¹³C sensitivity: S/N = 139 (natural abundance glycine, 4 scans)
• ¹⁵N sensitivity: S/N = 16 (natural abundance glycine, 4 scans)

Pulsed-Field-Gradient Diffusion Probe:

• gradient strength of 18 T/m
• sample temperature is controllable from -20 C to +80 °C
• three exchangeable inserts, one tuned singly for ¹H
• water cooling for high duty cycles
• micro-imaging capability

Thomas J. Bruno, 303-497-5158
bruno@boulder.nist.gov

System Operator:

Dr. Jason Widegren (jason.widegren@nist.gov) is the operator of the instrument, backed up by Dr. Tara M. Lovestead (taral@boulder.nist.gov).  All hands-on operations and experimental set up are handled by Dr. Widegren.  

NMR Users Group:

Scientists that have experiments on the NMR are members of the users group, which meets to discuss experiment proposals, address administrative and safety issues, and for periodic seminars.