Mode: NMR (1H, 19F), ESR

Operational Frequency: NMR 1H-13 MHz, NMR 19F-12.2 MHz, ESR-50 MHz

Frequency Stability: ≤ 1 PPM/ 1h

Electromagnet:

magnetic field: 300 mT
maximum current: 0.7A
coil: 2,000 turns
gap: 10.5 mm
pole diameter: 50 mm
homogeneity: ≤ 10^-4/sample volume
field stability: ≤ 10 μT/1 hr

Helmholtz Coils:

magnetic field: 195 μT
gap: 15 mm
coils diameter: 70 mm
homogeneity: 10-5/sample volume

Modulation Field:

frequency: 38 Hz
amplitude: 0.1-20 μT

Sweep of Magnetic Field (NMR and ESR):

range: 0.5 mT - 10.0 mT
time: 0.5 min - 30 min

Sweep of Frequency (only NMR):

range: 20 Hz - 400 kHz
time: 0.5 min - 30 min

RF Probehead:

solenoid coil dimensions: ID=5.8 mm; L=10 mm
mode: Automatically tuned for NMR or ESR

Receiver:

gain: 0-48 dB (2 dB step)
detection: phase-sensitive
phase adjustment: 0-360°, step 1.5°
signal filter: sweep controlled
DC offset converter: automatic

A/D Converter:

resolution:10 bit
number of samples: Min 512 per sweep

Weight and dimensions WxDxH:

electronic unit: 3.5 kg, 350x135x85 mm
probehead: 0.4 kg, 35x210x70 mm
Helmholtz coils (ESR): 0.5 kg, 50x80x110 mm
electromagnet (NMR): 10.5 kg, 175x100x160 mm

Power Consumption: 110V/220 V; 50/60 Hz; 40 W

Communication Port: two way RS 232C

Computer Required: IBM PC, min 750 MHz, VGA color or compatible

Software: MS Windows operated

NMR

Nuclei:

· 1H

· 1H and 19F

· 19F

Sample:

· H2O + CuSO4

· Rubber

· Acrylic

· Delrin

· HBF4

· Teflon

ESR

Sample (free radicals)

· TCNQ

· DPPH

Spectrometer

Operation:

Recording of NMR and ESR spectra

From recorded spectra one can determine:

1. Second moment
2. Line width
3. g factor
4. Line shape
5. Earth magnetic field magnitude
6. Accurate value of the magnetic field in electromagnet and Helmholtz coil

CWS 12-50 Spectrometer Specifications

NMR

ESR

Spectrometer